Pull drm fixes from Dave Airlie:
 "Weekly fixes for drm: amdgpu has a few but they are pretty scattered
  fixes, the fbdev one is a build regression fix that we didn't want to
  risk leaving out, otherwise a couple of i915, one radeon and a core
  atomic fix.

  core:
   - add missing documentation for GEM shmem madvise helpers
   - Fix for a state dereference in atomic self-refresh helpers

  fbdev:
   - One compilation fix for c2p fbdev helpers

  amdgpu:
   - Fix navi14 display issue root cause and revert workaround
   - GPU reset scheduler interaction fix
   - Fix fan boost on multi-GPU
   - Gfx10 and sdma5 fixes for navi
   - GFXOFF fix for renoir
   - Add navi14 PCI ID
   - GPUVM fix for arcturus

  radeon:
   - Port an SI power fix from amdgpu

  i915:
   - Fix HPD poll to avoid kworker consuming a lot of cpu cycles.
   - Do not use TBT type for non Type-C ports"

* tag 'drm-fixes-2019-11-08' of git://anongit.freedesktop.org/drm/drm:
  drm/radeon: fix si_enable_smc_cac() failed issue
  drm/amdgpu/renoir: move gfxoff handling into gfx9 module
  drm/amdgpu: add warning for GRBM 1-cycle delay issue in gfx9
  drm/amdgpu: add dummy read by engines for some GCVM status registers in gfx10
  drm/amdgpu: register gpu instance before fan boost feature enablment
  drm/amd/swSMU: fix smu workload bit map error
  drm/shmem: Add docbook comments for drm_gem_shmem_object madvise fields
  drm/amdgpu: add navi14 PCI ID
  Revert "drm/amd/display: setting the DIG_MODE to the correct value."
  drm/amd/display: Add ENGINE_ID_DIGD condition check for Navi14
  drm/amdgpu: dont schedule jobs while in reset
  drm/amdgpu/arcturus: properly set BANK_SELECT and FRAGMENT_SIZE
  drm/atomic: fix self-refresh helpers crtc state dereference
  drm/i915/dp: Do not switch aux to TBT mode for non-TC ports
  drm/i915: Avoid HPD poll detect triggering a new detect cycle
  fbdev: c2p: Fix link failure on non-inlining

Pull clk fixes from Stephen Boyd:
 "Fixes for various clk driver issues that happened because of code we
  merged this merge window.

  The Amlogic driver was missing some flags causing rates to be rounded
  improperly or clk_set_rate() to fail. The Samsung driver wasn't
  freeing everything on error paths and improperly saving/restoring PLL
  state across suspend/resume. The at91 driver was calling msleep() too
  early when scheduling hadn't started, so we put in place a quick
  solution until we can handle this sort of problem in the core
  framework.

  There were also problems with the Allwinner driver and operator
  precedence being incorrect causing subtle bugs. Finally, the TI driver
  was duplicating aliases and not delaying long enough leading to some
  unexpected timeouts"

* tag 'clk-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux:
  clk: ti: clkctrl: Fix failed to enable error with double udelay timeout
  clk: ti: dra7-atl-clock: Remove ti_clk_add_alias call
  clk: sunxi-ng: a80: fix the zero'ing of bits 16 and 18
  clk: sunxi: Fix operator precedence in sunxi_divs_clk_setup
  clk: ast2600: Fix enabling of clocks
  clk: at91: avoid sleeping early
  clk: imx8m: Use SYS_PLL1_800M as intermediate parent of CLK_ARM
  clk: samsung: exynos5420: Preserve PLL configuration during suspend/resume
  clk: samsung: exynos542x: Move G3D subsystem clocks to its sub-CMU
  clk: samsung: exynos5433: Fix error paths
  clk: at91: sam9x60: fix programmable clock
  clk: meson: g12a: set CLK_MUX_ROUND_CLOSEST on the cpu clock muxes
  clk: meson: g12a: fix cpu clock rate setting
  clk: meson: gxbb: let sar_adc_clk_div set the parent clock rate

drm-fixes-5.4-2019-11-06:

amdgpu:
- Fix navi14 display issue root cause and revert workaround
- GPU reset scheduler interaction fix
- Fix fan boost on multi-GPU
- Gfx10 and sdma5 fixes for navi
- GFXOFF fix for renoir
- Add navi14 PCI ID
- GPUVM fix for arcturus

radeon:
- Port an SI power fix from amdgpu
Signed-off-by: NDave Airlie <airlied@redhat.com>
From: Alex Deucher <alexdeucher@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191107032241.1021217-1-alexander.deucher@amd.com

Merge tag 'drm-intel-fixes-2019-11-06' of git://anongit.freedesktop.org/drm/drm-intel into drm-fixes

- Fix HPD poll to avoid kworker consuming a lot of cpu cycles.
- Do not use TBT type for non Type-C ports.
Signed-off-by: NDave Airlie <airlied@redhat.com>

From: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191106213958.GA16525@intel.com

Merge tag 'drm-misc-fixes-2019-11-07-1' of git://anongit.freedesktop.org/drm/drm-misc into drm-fixes

 - Some new documentation for GEM shmem madvise helpers
 - Fix for a state dereference in atomic self-refresh helpers
 - One compilation fix for c2p fbdev helpers
Signed-off-by: NDave Airlie <airlied@redhat.com>

From: Maxime Ripard <mripard@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20191107082215.GA34850@gilmour.lan

Pull HID fixes from Jiri Kosina:
 "Two fixes for the HID subsystem:

   - regression fix for i2c-hid power management (Hans de Goede)

   - signed vs unsigned API fix for Wacom driver (Jason Gerecke)"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid:
  HID: wacom: generic: Treat serial number and related fields as unsigned
  HID: i2c-hid: Send power-on command after reset

Need to set the dte flag on this asic.

Port the fix from amdgpu:
5cb818b8 ("drm/amd/amdgpu: fix si_enable_smc_cac() failed issue")
Reviewed-by: NYong Zhao <yong.zhao@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

To properly handle the option parsing ordering.
Reviewed-by: NYong Zhao <yong.zhao@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

It needs to add warning to update firmware in gfx9
in case that firmware is too old to have function to
realize dummy read in cp firmware.
Signed-off-by: Nchangzhu <Changfeng.Zhu@amd.com>
Reviewed-by: NChristian König <christian.koenig@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

The GRBM register interface is now capable of bursting 1 cycle per
register wr->wr, wr->rd much faster than previous muticycle per
transaction done interface.  This has caused a problem where
status registers requiring HW to update have a 1 cycle delay, due
to the register update having to go through GRBM.

For cp ucode, it has realized dummy read in cp firmware.It covers
the use of WAIT_REG_MEM operation 1 case only.So it needs to call
gfx_v10_0_wait_reg_mem in gfx10. Besides it also needs to add warning to
update firmware in case firmware is too old to have function to realize
dummy read in cp firmware.

For sdma ucode, it hasn't realized dummy read in sdma firmware. sdma is
moved to gfxhub in gfx10. So it needs to add dummy read in driver
between amdgpu_ring_emit_wreg and amdgpu_ring_emit_reg_wait for sdma_v5_0.
Signed-off-by: Nchangzhu <Changfeng.Zhu@amd.com>
Reviewed-by: NChristian König <christian.koenig@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

Otherwise, the feature enablement will be skipped due to wrong count.

Fixes: beff74bc ("drm/amdgpu: fix a race in GPU reset with IB test (v2)")
Signed-off-by: NEvan Quan <evan.quan@amd.com>
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

fix workload bit (WORKLOAD_PPLIB_COMPUTE_BIT) map error
on vega20 and navi asic.

fix commit:
drm/amd/powerplay: add function get_workload_type_map for swsmu
Signed-off-by: NKevin Wang <kevin1.wang@amd.com>
Reviewed-by: NKenneth Feng <kenneth.feng@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

Add missing docbook comments to madvise fields in struct
drm_gem_shmem_object which fixes these warnings:

include/drm/drm_gem_shmem_helper.h:87: warning: Function parameter or member 'madv' not described in 'drm_gem_shmem_object'
include/drm/drm_gem_shmem_helper.h:87: warning: Function parameter or member 'madv_list' not described in 'drm_gem_shmem_object'

Fixes: 17acb9f3 ("drm/shmem: Add madvise state and purge helpers")
Reported-by: NSean Paul <sean@poorly.run>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: NRob Herring <robh@kernel.org>
Reviewed-by: NSean Paul <sean@poorly.run>
Link: https://patchwork.freedesktop.org/patch/msgid/20191101153754.22803-1-robh@kernel.org

The HID descriptors for most Wacom devices oddly declare the serial
number and other related fields as signed integers. When these numbers
are ingested by the HID subsystem, they are automatically sign-extended
into 32-bit integers. We treat the fields as unsigned elsewhere in the
kernel and userspace, however, so this sign-extension causes problems.
In particular, the sign-extended tool ID sent to userspace as ABS_MISC
does not properly match unsigned IDs used by xf86-input-wacom and libwacom.

We introduce a function 'wacom_s32tou' that can undo the automatic sign
extension performed by 'hid_snto32'. We call this function when processing
the serial number and related fields to ensure that we are dealing with
and reporting the unsigned form. We opt to use this method rather than
adding a descriptor fixup in 'wacom_hid_usage_quirk' since it should be
more robust in the face of future devices.

Ref: https://github.com/linuxwacom/input-wacom/issues/134
Fixes: f85c9dc6 ("HID: wacom: generic: Support tool ID and additional tool types")
CC: <stable@vger.kernel.org> # v4.10+
Signed-off-by: NJason Gerecke <jason.gerecke@wacom.com>
Reviewed-by: NAaron Armstrong Skomra <aaron.skomra@wacom.com>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

Add the navi14 PCI device id.
Reviewed-by: NHawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: NTianci.Yin <tianci.yin@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

This reverts commit 385857ad.

Reason for revert: Root cause of this issue is found. The workaround is not needed anymore.
Signed-off-by: NZhan Liu <zhan.liu@amd.com>
Reviewed-by: NHersen Wu <hersenxs.wu@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

[Why]
Navi10 has 6 PHY, but Navi14 only has 5 PHY, that is
because there is no ENGINE_ID_DIGD in Navi14. Without
this patch, many HDMI related issues (e.g. HDMI S3
resume failure, HDMI pink screen on boot) will be
observed.

[How]
If "eng_id" is larger than ENGINE_ID_DIGD, then
add "eng_id" by 1.
Signed-off-by: NZhan Liu <zhan.liu@amd.com>
Reviewed-by: NHersen Wu <hersenxs.wu@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

[Why]

doing kthread_park()/unpark() from drm_sched_entity_fini
while GPU reset is in progress defeats all the purpose of
drm_sched_stop->kthread_park.
If drm_sched_entity_fini->kthread_unpark() happens AFTER
drm_sched_stop->kthread_park nothing prevents from another
(third) thread to keep submitting job to HW which will be
picked up by the unparked scheduler thread and try to submit
to HW but fail because the HW ring is deactivated.

[How]
grab the reset lock before calling drm_sched_entity_fini()
Signed-off-by: NShirish S <shirish.s@amd.com>
Suggested-by: NChristian König <christian.koenig@amd.com>
Reviewed-by: NChristian König <christian.koenig@amd.com>
Reviewed-by: NAndrey Grodzovsky <andrey.grodzovsky@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

These were not aligned for optimal performance for GPUVM.
Reviewed-by: NChristian König <christian.koenig@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

Merge more fixes from Andrew Morton:
 "17 fixes"

Mostly mm fixes and one ocfs2 locking fix.

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  mm: memcontrol: fix network errors from failing __GFP_ATOMIC charges
  mm/memory_hotplug: fix updating the node span
  scripts/gdb: fix debugging modules compiled with hot/cold partitioning
  mm: slab: make page_cgroup_ino() to recognize non-compound slab pages properly
  MAINTAINERS: update information for "MEMORY MANAGEMENT"
  dump_stack: avoid the livelock of the dump_lock
  zswap: add Vitaly to the maintainers list
  mm/page_alloc.c: ratelimit allocation failure warnings more aggressively
  mm/khugepaged: fix might_sleep() warn with CONFIG_HIGHPTE=y
  mm, vmstat: reduce zone->lock holding time by /proc/pagetypeinfo
  mm, vmstat: hide /proc/pagetypeinfo from normal users
  mm/mmu_notifiers: use the right return code for WARN_ON
  ocfs2: protect extent tree in ocfs2_prepare_inode_for_write()
  mm: thp: handle page cache THP correctly in PageTransCompoundMap
  mm, meminit: recalculate pcpu batch and high limits after init completes
  mm/gup_benchmark: fix MAP_HUGETLB case
  mm: memcontrol: fix NULL-ptr deref in percpu stats flush

drm_self_refresh_helper_update_avg_times() was incorrectly accessing the
new incoming state after drm_atomic_helper_commit_hw_done().  But this
state might have already been superceeded by an !nonblock atomic update
resulting in dereferencing an already free'd crtc_state.

TODO I *think* this will more or less do the right thing.. althought I'm
not 100% sure if, for example, we enter psr in a nonblock commit, and
then leave psr in a !nonblock commit that overtakes the completion of
the nonblock commit.  Not sure if this sort of scenario can happen in
practice.  But not crashing is better than crashing, so I guess we
should either take this patch or rever the self-refresh helpers until
Sean can figure out a better solution.

Fixes: d4da4e33 ("drm: Measure Self Refresh Entry/Exit times to avoid thrashing")
Cc: Sean Paul <seanpaul@chromium.org>
Signed-off-by: NRob Clark <robdclark@chromium.org>
[seanpaul fixed up some checkpatch warns]
Signed-off-by: NSean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20191104173737.142558-1-robdclark@gmail.com

While upgrading from 4.16 to 5.2, we noticed these allocation errors in
the log of the new kernel:

  SLUB: Unable to allocate memory on node -1, gfp=0xa20(GFP_ATOMIC)
    cache: tw_sock_TCPv6(960:helper-logs), object size: 232, buffer size: 240, default order: 1, min order: 0
    node 0: slabs: 5, objs: 170, free: 0

        slab_out_of_memory+1
        ___slab_alloc+969
        __slab_alloc+14
        kmem_cache_alloc+346
        inet_twsk_alloc+60
        tcp_time_wait+46
        tcp_fin+206
        tcp_data_queue+2034
        tcp_rcv_state_process+784
        tcp_v6_do_rcv+405
        __release_sock+118
        tcp_close+385
        inet_release+46
        __sock_release+55
        sock_close+17
        __fput+170
        task_work_run+127
        exit_to_usermode_loop+191
        do_syscall_64+212
        entry_SYSCALL_64_after_hwframe+68

accompanied by an increase in machines going completely radio silent
under memory pressure.

One thing that changed since 4.16 is e699e2c6 ("net, mm: account
sock objects to kmemcg"), which made these slab caches subject to cgroup
memory accounting and control.

The problem with that is that cgroups, unlike the page allocator, do not
maintain dedicated atomic reserves.  As a cgroup's usage hovers at its
limit, atomic allocations - such as done during network rx - can fail
consistently for extended periods of time.  The kernel is not able to
operate under these conditions.

We don't want to revert the culprit patch, because it indeed tracks a
potentially substantial amount of memory used by a cgroup.

We also don't want to implement dedicated atomic reserves for cgroups.
There is no point in keeping a fixed margin of unused bytes in the
cgroup's memory budget to accomodate a consumer that is impossible to
predict - we'd be wasting memory and get into configuration headaches,
not unlike what we have going with min_free_kbytes.  We do this for
physical mem because we have to, but cgroups are an accounting game.

Instead, account these privileged allocations to the cgroup, but let
them bypass the configured limit if they have to.  This way, we get the
benefits of accounting the consumed memory and have it exert pressure on
the rest of the cgroup, but like with the page allocator, we shift the
burden of reclaimining on behalf of atomic allocations onto the regular
allocations that can block.

Link: http://lkml.kernel.org/r/20191022233708.365764-1-hannes@cmpxchg.org
Fixes: e699e2c6 ("net, mm: account sock objects to kmemcg")
Signed-off-by: NJohannes Weiner <hannes@cmpxchg.org>
Reviewed-by: NShakeel Butt <shakeelb@google.com>
Cc: Suleiman Souhlal <suleiman@google.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: <stable@vger.kernel.org>	[4.18+]
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

We recently started updating the node span based on the zone span to
avoid touching uninitialized memmaps.

Currently, we will always detect the node span to start at 0, meaning a
node can easily span too many pages.  pgdat_is_empty() will still work
correctly if all zones span no pages.  We should skip over all zones
without spanned pages and properly handle the first detected zone that
spans pages.

Unfortunately, in contrast to the zone span (/proc/zoneinfo), the node
span cannot easily be inspected and tested.  The node span gives no real
guarantees when an architecture supports memory hotplug, meaning it can
easily contain holes or span pages of different nodes.

The node span is not really used after init on architectures that
support memory hotplug.

E.g., we use it in mm/memory_hotplug.c:try_offline_node() and in
mm/kmemleak.c:kmemleak_scan().  These users seem to be fine.

Link: http://lkml.kernel.org/r/20191027222714.5313-1-david@redhat.com
Fixes: 00d6c019 ("mm/memory_hotplug: don't access uninitialized memmaps in shrink_pgdat_span()")
Signed-off-by: NDavid Hildenbrand <david@redhat.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

gcc's -freorder-blocks-and-partition option makes it group frequently
and infrequently used code in .text.hot and .text.unlikely sections
respectively.  At least when building modules on s390, this option is
used by default.

gdb assumes that all code is located in .text section, and that .text
section is located at module load address.  With such modules this is no
longer the case: there is code in .text.hot and .text.unlikely, and
either of them might precede .text.

Fix by explicitly telling gdb the addresses of code sections.

It might be tempting to do this for all sections, not only the ones in
the white list.  Unfortunately, gdb appears to have an issue, when
telling it about e.g. loadable .note.gnu.build-id section causes it to
think that non-loadable .note.Linux section is loaded at address 0,
which in turn causes NULL pointers to be resolved to bogus symbols.  So
keep using the white list approach for the time being.

Link: http://lkml.kernel.org/r/20191028152734.13065-1-iii@linux.ibm.comSigned-off-by: NIlya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: NJan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

page_cgroup_ino() doesn't return a valid memcg pointer for non-compound
slab pages, because it depends on PgHead AND PgSlab flags to be set to
determine the memory cgroup from the kmem_cache.  It's correct for
compound pages, but not for generic small pages.  Those don't have PgHead
set, so it ends up returning zero.

Fix this by replacing the condition to PageSlab() && !PageTail().

Before this patch:
  [root@localhost ~]# ./page-types -c /sys/fs/cgroup/user.slice/user-0.slice/user@0.service/ | grep slab
  0x0000000000000080	        38        0  _______S___________________________________	slab

After this patch:
  [root@localhost ~]# ./page-types -c /sys/fs/cgroup/user.slice/user-0.slice/user@0.service/ | grep slab
  0x0000000000000080	       147        0  _______S___________________________________	slab

Also, hwpoison_filter_task() uses output of page_cgroup_ino() in order
to filter error injection events based on memcg.  So if
page_cgroup_ino() fails to return memcg pointer, we just fail to inject
memory error.  Considering that hwpoison filter is for testing, affected
users are limited and the impact should be marginal.

[n-horiguchi@ah.jp.nec.com: changelog additions]
Link: http://lkml.kernel.org/r/20191031012151.2722280-1-guro@fb.com
Fixes: 4d96ba35 ("mm: memcg/slab: stop setting page->mem_cgroup pointer for slab pages")
Signed-off-by: NRoman Gushchin <guro@fb.com>
Reviewed-by: NShakeel Butt <shakeelb@google.com>
Acked-by: NDavid Rientjes <rientjes@google.com>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Daniel Jordan <daniel.m.jordan@oracle.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

I was trying to find the mm tree in MAINTAINERS by searching "Morton".
Unfortunately, I didn't find one.  And I didn't even locate the MEMORY
MANAGEMENT section quickly, because Andrew's name was not listed there.

Thanks to Johannes who helped me find the mm tree.

Let save other's time searching around by adding:

M:	Andrew Morton <akpm@linux-foundation.org>
T:	git git://github.com/hnaz/linux-mm.git

[akpm@linux-foundation.org: add ozlabs.org quilt trees]
Link: http://lkml.kernel.org/r/20191030202217.3498133-1-songliubraving@fb.comSigned-off-by: NSong Liu <songliubraving@fb.com>
Acked-by: NAndrew Morton <akpm@linux-foundation.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

In the current code, we use the atomic_cmpxchg() to serialize the output
of the dump_stack(), but this implementation suffers the thundering herd
problem.  We have observed such kind of livelock on a Marvell cn96xx
board(24 cpus) when heavily using the dump_stack() in a kprobe handler.
Actually we can let the competitors to wait for the releasing of the
lock before jumping to atomic_cmpxchg().  This will definitely mitigate
the thundering herd problem.  Thanks Linus for the suggestion.

[akpm@linux-foundation.org: fix comment]
Link: http://lkml.kernel.org/r/20191030031637.6025-1-haokexin@gmail.com
Fixes: b58d9774 ("dump_stack: serialize the output from dump_stack()")
Signed-off-by: NKevin Hao <haokexin@gmail.com>
Suggested-by: NLinus Torvalds <torvalds@linux-foundation.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Per conversation with Dan, add myself to the zswap MAINTAINERS list.

Link: http://lkml.kernel.org/r/20191028143154.31304-1-vitaly.wool@konsulko.comSigned-off-by: NVitaly Wool <vitaly.wool@konsulko.com>
Acked-by: NDan Streetman <ddstreet@ieee.org>
Acked-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

While investigating a bug related to higher atomic allocation failures,
we noticed the failure warnings positively drowning the console, and in
our case trigger lockup warnings because of a serial console too slow to
handle all that output.

But even if we had a faster console, it's unclear what additional
information the current level of repetition provides.

Allocation failures happen for three reasons: The machine is OOM, the VM
is failing to handle reasonable requests, or somebody is making
unreasonable requests (and didn't acknowledge their opportunism with
__GFP_NOWARN).  Having the memory dump, a callstack, and the ratelimit
stats on skipped failure warnings should provide enough information to
let users/admins/developers know whether something is wrong and point
them in the right direction for debugging, bpftracing etc.

Limit allocation failure warnings to one spew every ten seconds.

Link: http://lkml.kernel.org/r/20191028194906.26899-1-hannes@cmpxchg.orgSigned-off-by: NJohannes Weiner <hannes@cmpxchg.org>
Acked-by: NDavid Rientjes <rientjes@google.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

I got some khugepaged spew on a 32bit x86:

  BUG: sleeping function called from invalid context at include/linux/mmu_notifier.h:346
  in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 25, name: khugepaged
  INFO: lockdep is turned off.
  CPU: 1 PID: 25 Comm: khugepaged Not tainted 5.4.0-rc5-elk+ #206
  Hardware name: System manufacturer P5Q-EM/P5Q-EM, BIOS 2203    07/08/2009
  Call Trace:
   dump_stack+0x66/0x8e
   ___might_sleep.cold.96+0x95/0xa6
   __might_sleep+0x2e/0x80
   collapse_huge_page.isra.51+0x5ac/0x1360
   khugepaged+0x9a9/0x20f0
   kthread+0xf5/0x110
   ret_from_fork+0x2e/0x38

Looks like it's due to CONFIG_HIGHPTE=y pte_offset_map()->kmap_atomic()
vs.  mmu_notifier_invalidate_range_start().  Let's do the naive approach
and just reorder the two operations.

Link: http://lkml.kernel.org/r/20191029201513.GG1208@intel.com
Fixes: 810e24e0 ("mm/mmu_notifiers: annotate with might_sleep()")
Signed-off-by: NVille Syrjl <ville.syrjala@linux.intel.com>
Reviewed-by: NAndrew Morton <akpm@linux-foundation.org>
Acked-by: NKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Jérôme Glisse <jglisse@redhat.com>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Jason Gunthorpe <jgg@mellanox.com>
Cc: Daniel Vetter <daniel.vetter@intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

pagetypeinfo_showfree_print is called by zone->lock held in irq mode.
This is not really nice because it blocks both any interrupts on that
cpu and the page allocator.  On large machines this might even trigger
the hard lockup detector.

Considering the pagetypeinfo is a debugging tool we do not really need
exact numbers here.  The primary reason to look at the outuput is to see
how pageblocks are spread among different migratetypes and low number of
pages is much more interesting therefore putting a bound on the number
of pages on the free_list sounds like a reasonable tradeoff.

The new output will simply tell
  [...]
  Node    6, zone   Normal, type      Movable >100000 >100000 >100000 >100000  41019  31560  23996  10054   3229    983    648

instead of
  Node    6, zone   Normal, type      Movable 399568 294127 221558 102119  41019  31560  23996  10054   3229    983    648

The limit has been chosen arbitrary and it is a subject of a future
change should there be a need for that.

While we are at it, also drop the zone lock after each free_list
iteration which will help with the IRQ and page allocator responsiveness
even further as the IRQ lock held time is always bound to those 100k
pages.

[akpm@linux-foundation.org: tweak comment text, per David Hildenbrand]
Link: http://lkml.kernel.org/r/20191025072610.18526-3-mhocko@kernel.orgSigned-off-by: NMichal Hocko <mhocko@suse.com>
Suggested-by: NAndrew Morton <akpm@linux-foundation.org>
Reviewed-by: NWaiman Long <longman@redhat.com>
Acked-by: NVlastimil Babka <vbabka@suse.cz>
Acked-by: NDavid Hildenbrand <david@redhat.com>
Acked-by: NRafael Aquini <aquini@redhat.com>
Acked-by: NDavid Rientjes <rientjes@google.com>
Reviewed-by: NAndrew Morton <akpm@linux-foundation.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jann Horn <jannh@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Roman Gushchin <guro@fb.com>
Cc: Song Liu <songliubraving@fb.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

/proc/pagetypeinfo is a debugging tool to examine internal page
allocator state wrt to fragmentation.  It is not very useful for any
other use so normal users really do not need to read this file.

Waiman Long has noticed that reading this file can have negative side
effects because zone->lock is necessary for gathering data and that a)
interferes with the page allocator and its users and b) can lead to hard
lockups on large machines which have very long free_list.

Reduce both issues by simply not exporting the file to regular users.

Link: http://lkml.kernel.org/r/20191025072610.18526-2-mhocko@kernel.org
Fixes: 467c996c ("Print out statistics in relation to fragmentation avoidance to /proc/pagetypeinfo")
Signed-off-by: NMichal Hocko <mhocko@suse.com>
Reported-by: NWaiman Long <longman@redhat.com>
Acked-by: NMel Gorman <mgorman@suse.de>
Acked-by: NVlastimil Babka <vbabka@suse.cz>
Acked-by: NWaiman Long <longman@redhat.com>
Acked-by: NRafael Aquini <aquini@redhat.com>
Acked-by: NDavid Rientjes <rientjes@google.com>
Reviewed-by: NAndrew Morton <akpm@linux-foundation.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Roman Gushchin <guro@fb.com>
Cc: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Cc: Jann Horn <jannh@google.com>
Cc: Song Liu <songliubraving@fb.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

The return code from the op callback is actually in _ret, while the
WARN_ON was checking ret which causes it to misfire.

Link: http://lkml.kernel.org/r/20191025175502.GA31127@ziepe.ca
Fixes: 8402ce61 ("mm/mmu_notifiers: check if mmu notifier callbacks are allowed to fail")
Signed-off-by: NJason Gunthorpe <jgg@mellanox.com>
Reviewed-by: NAndrew Morton <akpm@linux-foundation.org>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

When the extent tree is modified, it should be protected by inode
cluster lock and ip_alloc_sem.

The extent tree is accessed and modified in the
ocfs2_prepare_inode_for_write, but isn't protected by ip_alloc_sem.

The following is a case.  The function ocfs2_fiemap is accessing the
extent tree, which is modified at the same time.

  kernel BUG at fs/ocfs2/extent_map.c:475!
  invalid opcode: 0000 [#1] SMP
  Modules linked in: tun ocfs2 ocfs2_nodemanager configfs ocfs2_stackglue [...]
  CPU: 16 PID: 14047 Comm: o2info Not tainted 4.1.12-124.23.1.el6uek.x86_64 #2
  Hardware name: Oracle Corporation ORACLE SERVER X7-2L/ASM, MB MECH, X7-2L, BIOS 42040600 10/19/2018
  task: ffff88019487e200 ti: ffff88003daa4000 task.ti: ffff88003daa4000
  RIP: ocfs2_get_clusters_nocache.isra.11+0x390/0x550 [ocfs2]
  Call Trace:
    ocfs2_fiemap+0x1e3/0x430 [ocfs2]
    do_vfs_ioctl+0x155/0x510
    SyS_ioctl+0x81/0xa0
    system_call_fastpath+0x18/0xd8
  Code: 18 48 c7 c6 60 7f 65 a0 31 c0 bb e2 ff ff ff 48 8b 4a 40 48 8b 7a 28 48 c7 c2 78 2d 66 a0 e8 38 4f 05 00 e9 28 fe ff ff 0f 1f 00 <0f> 0b 66 0f 1f 44 00 00 bb 86 ff ff ff e9 13 fe ff ff 66 0f 1f
  RIP  ocfs2_get_clusters_nocache.isra.11+0x390/0x550 [ocfs2]
  ---[ end trace c8aa0c8180e869dc ]---
  Kernel panic - not syncing: Fatal exception
  Kernel Offset: disabled

This issue can be reproduced every week in a production environment.

This issue is related to the usage mode.  If others use ocfs2 in this
mode, the kernel will panic frequently.

[akpm@linux-foundation.org: coding style fixes]
[Fix new warning due to unused function by removing said function - Linus ]
Link: http://lkml.kernel.org/r/1568772175-2906-2-git-send-email-sunny.s.zhang@oracle.comSigned-off-by: NShuning Zhang <sunny.s.zhang@oracle.com>
Reviewed-by: NJunxiao Bi <junxiao.bi@oracle.com>
Reviewed-by: NGang He <ghe@suse.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joseph Qi <jiangqi903@gmail.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Jun Piao <piaojun@huawei.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

We have a usecase to use tmpfs as QEMU memory backend and we would like
to take the advantage of THP as well.  But, our test shows the EPT is
not PMD mapped even though the underlying THP are PMD mapped on host.
The number showed by /sys/kernel/debug/kvm/largepage is much less than
the number of PMD mapped shmem pages as the below:

  7f2778200000-7f2878200000 rw-s 00000000 00:14 262232 /dev/shm/qemu_back_mem.mem.Hz2hSf (deleted)
  Size:            4194304 kB
  [snip]
  AnonHugePages:         0 kB
  ShmemPmdMapped:   579584 kB
  [snip]
  Locked:                0 kB

  cat /sys/kernel/debug/kvm/largepages
  12

And some benchmarks do worse than with anonymous THPs.

By digging into the code we figured out that commit 127393fb ("mm:
thp: kvm: fix memory corruption in KVM with THP enabled") checks if
there is a single PTE mapping on the page for anonymous THP when setting
up EPT map.  But the _mapcount < 0 check doesn't work for page cache THP
since every subpage of page cache THP would get _mapcount inc'ed once it
is PMD mapped, so PageTransCompoundMap() always returns false for page
cache THP.  This would prevent KVM from setting up PMD mapped EPT entry.

So we need handle page cache THP correctly.  However, when page cache
THP's PMD gets split, kernel just remove the map instead of setting up
PTE map like what anonymous THP does.  Before KVM calls get_user_pages()
the subpages may get PTE mapped even though it is still a THP since the
page cache THP may be mapped by other processes at the mean time.

Checking its _mapcount and whether the THP has PTE mapped or not.
Although this may report some false negative cases (PTE mapped by other
processes), it looks not trivial to make this accurate.

With this fix /sys/kernel/debug/kvm/largepage would show reasonable
pages are PMD mapped by EPT as the below:

  7fbeaee00000-7fbfaee00000 rw-s 00000000 00:14 275464 /dev/shm/qemu_back_mem.mem.SKUvat (deleted)
  Size:            4194304 kB
  [snip]
  AnonHugePages:         0 kB
  ShmemPmdMapped:   557056 kB
  [snip]
  Locked:                0 kB

  cat /sys/kernel/debug/kvm/largepages
  271

And the benchmarks are as same as anonymous THPs.

[yang.shi@linux.alibaba.com: v4]
  Link: http://lkml.kernel.org/r/1571865575-42913-1-git-send-email-yang.shi@linux.alibaba.com
Link: http://lkml.kernel.org/r/1571769577-89735-1-git-send-email-yang.shi@linux.alibaba.com
Fixes: dd78fedd ("rmap: support file thp")
Signed-off-by: NYang Shi <yang.shi@linux.alibaba.com>
Reported-by: NGang Deng <gavin.dg@linux.alibaba.com>
Tested-by: NGang Deng <gavin.dg@linux.alibaba.com>
Suggested-by: NHugh Dickins <hughd@google.com>
Acked-by: NKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: <stable@vger.kernel.org>	[4.8+]
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Deferred memory initialisation updates zone->managed_pages during the
initialisation phase but before that finishes, the per-cpu page
allocator (pcpu) calculates the number of pages allocated/freed in
batches as well as the maximum number of pages allowed on a per-cpu
list.  As zone->managed_pages is not up to date yet, the pcpu
initialisation calculates inappropriately low batch and high values.

This increases zone lock contention quite severely in some cases with
the degree of severity depending on how many CPUs share a local zone and
the size of the zone.  A private report indicated that kernel build
times were excessive with extremely high system CPU usage.  A perf
profile indicated that a large chunk of time was lost on zone->lock
contention.

This patch recalculates the pcpu batch and high values after deferred
initialisation completes for every populated zone in the system.  It was
tested on a 2-socket AMD EPYC 2 machine using a kernel compilation
workload -- allmodconfig and all available CPUs.

mmtests configuration: config-workload-kernbench-max Configuration was
modified to build on a fresh XFS partition.

kernbench
                                5.4.0-rc3              5.4.0-rc3
                                  vanilla           resetpcpu-v2
Amean     user-256    13249.50 (   0.00%)    16401.31 * -23.79%*
Amean     syst-256    14760.30 (   0.00%)     4448.39 *  69.86%*
Amean     elsp-256      162.42 (   0.00%)      119.13 *  26.65%*
Stddev    user-256       42.97 (   0.00%)       19.15 (  55.43%)
Stddev    syst-256      336.87 (   0.00%)        6.71 (  98.01%)
Stddev    elsp-256        2.46 (   0.00%)        0.39 (  84.03%)

                   5.4.0-rc3    5.4.0-rc3
                     vanilla resetpcpu-v2
Duration User       39766.24     49221.79
Duration System     44298.10     13361.67
Duration Elapsed      519.11       388.87

The patch reduces system CPU usage by 69.86% and total build time by
26.65%.  The variance of system CPU usage is also much reduced.

Before, this was the breakdown of batch and high values over all zones
was:

    256               batch: 1
    256               batch: 63
    512               batch: 7
    256               high:  0
    256               high:  378
    512               high:  42

512 pcpu pagesets had a batch limit of 7 and a high limit of 42.  After
the patch:

    256               batch: 1
    768               batch: 63
    256               high:  0
    768               high:  378

[mgorman@techsingularity.net: fix merge/linkage snafu]
  Link: http://lkml.kernel.org/r/20191023084705.GD3016@techsingularity.netLink: http://lkml.kernel.org/r/20191021094808.28824-2-mgorman@techsingularity.netSigned-off-by: NMel Gorman <mgorman@techsingularity.net>
Acked-by: NMichal Hocko <mhocko@suse.com>
Acked-by: NVlastimil Babka <vbabka@suse.cz>
Acked-by: NDavid Hildenbrand <david@redhat.com>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Qian Cai <cai@lca.pw>
Cc: <stable@vger.kernel.org>	[4.1+]
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

The MAP_HUGETLB ("-H" option) of gup_benchmark fails:

  $ sudo ./gup_benchmark -H
  mmap: Invalid argument

This is because gup_benchmark.c is passing in a file descriptor to
mmap(), but the fd came from opening up the /dev/zero file.  This
confuses the mmap syscall implementation, which thinks that, if the
caller did not specify MAP_ANONYMOUS, then the file must be a huge page
file.  So it attempts to verify that the file really is a huge page
file, as you can see here:

ksys_mmap_pgoff()
{
    if (!(flags & MAP_ANONYMOUS)) {
        retval = -EINVAL;
        if (unlikely(flags & MAP_HUGETLB && !is_file_hugepages(file)))
            goto out_fput; /* THIS IS WHERE WE END UP */

    else if (flags & MAP_HUGETLB) {
        ...proceed normally, /dev/zero is ok here...

...and of course is_file_hugepages() returns "false" for the /dev/zero
file.

The problem is that the user space program, gup_benchmark.c, really just
wants anonymous memory here.  The simplest way to get that is to pass
MAP_ANONYMOUS whenever MAP_HUGETLB is specified, so that's what this
patch does.

Link: http://lkml.kernel.org/r/20191021212435.398153-2-jhubbard@nvidia.comSigned-off-by: NJohn Hubbard <jhubbard@nvidia.com>
Reviewed-by: NAndrew Morton <akpm@linux-foundation.org>
Reviewed-by: NJérôme Glisse <jglisse@redhat.com>
Cc: Keith Busch <keith.busch@intel.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

__mem_cgroup_free() can be called on the failure path in
mem_cgroup_alloc().  However memcg_flush_percpu_vmstats() and
memcg_flush_percpu_vmevents() which are called from __mem_cgroup_free()
access the fields of memcg which can potentially be null if called from
failure path from mem_cgroup_alloc().  Indeed syzbot has reported the
following crash:

	kasan: CONFIG_KASAN_INLINE enabled
	kasan: GPF could be caused by NULL-ptr deref or user memory access
	general protection fault: 0000 [#1] PREEMPT SMP KASAN
	CPU: 0 PID: 30393 Comm: syz-executor.1 Not tainted 5.4.0-rc2+ #0
	Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
	RIP: 0010:memcg_flush_percpu_vmstats+0x4ae/0x930 mm/memcontrol.c:3436
	Code: 05 41 89 c0 41 0f b6 04 24 41 38 c7 7c 08 84 c0 0f 85 5d 03 00 00 44 3b 05 33 d5 12 08 0f 83 e2 00 00 00 4c 89 f0 48 c1 e8 03 <42> 80 3c 28 00 0f 85 91 03 00 00 48 8b 85 10 fe ff ff 48 8b b0 90
	RSP: 0018:ffff888095c27980 EFLAGS: 00010206
	RAX: 0000000000000012 RBX: ffff888095c27b28 RCX: ffffc90008192000
	RDX: 0000000000040000 RSI: ffffffff8340fae7 RDI: 0000000000000007
	RBP: ffff888095c27be0 R08: 0000000000000000 R09: ffffed1013f0da33
	R10: ffffed1013f0da32 R11: ffff88809f86d197 R12: fffffbfff138b760
	R13: dffffc0000000000 R14: 0000000000000090 R15: 0000000000000007
	FS:  00007f5027170700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
	CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
	CR2: 0000000000710158 CR3: 00000000a7b18000 CR4: 00000000001406f0
	DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
	DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
	Call Trace:
	__mem_cgroup_free+0x1a/0x190 mm/memcontrol.c:5021
	mem_cgroup_free mm/memcontrol.c:5033 [inline]
	mem_cgroup_css_alloc+0x3a1/0x1ae0 mm/memcontrol.c:5160
	css_create kernel/cgroup/cgroup.c:5156 [inline]
	cgroup_apply_control_enable+0x44d/0xc40 kernel/cgroup/cgroup.c:3119
	cgroup_mkdir+0x899/0x11b0 kernel/cgroup/cgroup.c:5401
	kernfs_iop_mkdir+0x14d/0x1d0 fs/kernfs/dir.c:1124
	vfs_mkdir+0x42e/0x670 fs/namei.c:3807
	do_mkdirat+0x234/0x2a0 fs/namei.c:3830
	__do_sys_mkdir fs/namei.c:3846 [inline]
	__se_sys_mkdir fs/namei.c:3844 [inline]
	__x64_sys_mkdir+0x5c/0x80 fs/namei.c:3844
	do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290
	entry_SYSCALL_64_after_hwframe+0x49/0xbe

Fixing this by moving the flush to mem_cgroup_free as there is no need
to flush anything if we see failure in mem_cgroup_alloc().

Link: http://lkml.kernel.org/r/20191018165231.249872-1-shakeelb@google.com
Fixes: bb65f89b ("mm: memcontrol: flush percpu vmevents before releasing memcg")
Fixes: c350a99e ("mm: memcontrol: flush percpu vmstats before releasing memcg")
Signed-off-by: NShakeel Butt <shakeelb@google.com>
Reported-by: syzbot+515d5bcfe179cdf049b2@syzkaller.appspotmail.com
Reviewed-by: NRoman Gushchin <guro@fb.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Pull clone3 stack argument update from Christian Brauner:
 "This changes clone3() to do basic stack validation and to set up the
  stack depending on whether or not it is growing up or down.

  With clone3() the expectation is now very simply that the .stack
  argument points to the lowest address of the stack and that
  .stack_size specifies the initial stack size. This is diferent from
  legacy clone() where the "stack" argument had to point to the lowest
  or highest address of the stack depending on the architecture.

  clone3() was released with 5.3. Currently, it is not documented and
  very unclear to userspace how the stack and stack_size argument have
  to be passed. After talking to glibc folks we concluded that changing
  clone3() to determine stack direction and doing basic validation is
  the right course of action.

  Note, this is a potentially user visible change. In the very unlikely
  case, that it breaks someone's use-case we will revert. (And then e.g.
  place the new behavior under an appropriate flag.)

  Note that passing an empty stack will continue working just as before.
  Breaking someone's use-case is very unlikely. Neither glibc nor musl
  currently expose a wrapper for clone3(). There is currently also no
  real motivation for anyone to use clone3() directly. First, because
  using clone{3}() with stacks requires some assembly (see glibc and
  musl). Second, because it does not provide features that legacy
  clone() doesn't. New features for clone3() will first happen in v5.5
  which is why v5.4 is still a good time to try and make that change now
  and backport it to v5.3.

  I did a codesearch on https://codesearch.debian.net, github, and
  gitlab and could not find any software currently relying directly on
  clone3(). I expect this to change once we land CLONE_CLEAR_SIGHAND
  which was a request coming from glibc at which point they'll likely
  start using it"

* tag 'for-linus-2019-11-05' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux:
  clone3: validate stack arguments

Pull GPIO fixes from Linus Walleij:
 "More GPIO fixes! We found a late regression in the Intel Merrifield
  driver. Oh well. We fixed it up.

   - Fix a build error in the tools used for kselftest

   - A series of reverts to bring the Intel Merrifield back to working.

  We will likely unrevert the reverts for v5.5 but we can't have v5.4
  broken"

* tag 'gpio-v5.4-4' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio:
  Revert "gpio: merrifield: Pass irqchip when adding gpiochip"
  Revert "gpio: merrifield: Restore use of irq_base"
  Revert "gpio: merrifield: Move hardware initialization to callback"
  tools: gpio: Use !building_out_of_srctree to determine srctree