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  1. 10 1月, 2017 3 次提交
    • G
      drm: Document drm_cache interface · f0e36723
      由 Gabriel Krisman Bertazi 提交于 
      Notice that this uncovers an issue with the kernel-doc handling of array
arguments, causing the first parameter of drm_clflush_pages() to not
show up in the rst-generated page.  A proposed fix is under review in
linux-doc: <http://www.spinics.net/lists/linux-doc/msg42544.html>

Changes since v1:
 - Add section to drm-mm.rst.
 - Fix kernel-doc style issues.
 - s/memory/kernel memory/.
Signed-off-by: NGabriel Krisman Bertazi <krisman@collabora.co.uk>
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20170109215649.6860-1-krisman@collabora.co.uk
      f0e36723
    • D
      Merge tag 'drm-misc-next-2017-01-09' of git://anongit.freedesktop.org/git/drm-misc into drm-next · 282d0a35
      由 Dave Airlie 提交于 
      Back to regular -misc pulls with reasonable sizes:
- dma_fence error clarification (Chris)
- drm_crtc_from_index helper (Shawn), pile more patches on the m-l to roll
  this out to drivers
- mmu-less support for fbdev helpers from Benjamin
- piles of kerneldoc work
- some polish for crc support from Tomeu and Benjamin
- odd misc stuff all over

* tag 'drm-misc-next-2017-01-09' of git://anongit.freedesktop.org/git/drm-misc: (48 commits)
  dma-fence: Introduce drm_fence_set_error() helper
  dma-fence: Wrap querying the fence->status
  dma-fence: Clear fence->status during dma_fence_init()
  drm: fix compilations issues introduced by "drm: allow to use mmuless SoC"
  drm: Change the return type of the unload hook to void
  drm: add more document for drm_crtc_from_index()
  drm: remove useless parameters from drm_pick_cmdline_mode function
  drm: crc: Call wake_up_interruptible() each time there is a new CRC entry
  drm: allow to use mmuless SoC
  drm: compile drm_vm.c only when needed
  fbmem: add a default get_fb_unmapped_area function
  drm: crc: Wait for a frame before returning from open()
  drm: Move locking into drm_debugfs_crtc_crc_add
  drm/imx: imx-tve: Remove unused variable
  Revert "drm: nouveau: fix build when LEDS_CLASS=m"
  drm: Add kernel-doc for drm_crtc_commit_get/put
  drm/atomic: Fix outdated comment.
  drm: reference count event->completion
  gpu: drm: mgag200: mgag200_main:- Handle error from pci_iomap
  drm: Document deprecated load/unload hook
  ...
      282d0a35
    • D
      Merge tag 'drm-intel-next-2017-01-09' of git://anongit.freedesktop.org/git/drm-intel into drm-next · 5c37daf5
      由 Dave Airlie 提交于 
      More 4.11 stuff, holidays edition (i.e. not much):

- docs and cleanups for shared dpll code (Ander)
- some kerneldoc work (Chris)
- fbc by default on gen9+ too, yeah! (Paulo)
- fixes, polish and other small things all over gem code (Chris)
- and a few small things on top

Plus a backmerge, because Dave was enjoying time off too.

* tag 'drm-intel-next-2017-01-09' of git://anongit.freedesktop.org/git/drm-intel: (275 commits)
  drm/i915: Update DRIVER_DATE to 20170109
  drm/i915: Drain freed objects for mmap space exhaustion
  drm/i915: Purge loose pages if we run out of DMA remap space
  drm/i915: Fix phys pwrite for struct_mutex-less operation
  drm/i915: Simplify testing for am-I-the-kernel-context?
  drm/i915: Use range_overflows()
  drm/i915: Use fixed-sized types for stolen
  drm/i915: Use phys_addr_t for the address of stolen memory
  drm/i915: Consolidate checks for memcpy-from-wc support
  drm/i915: Only skip requests once a context is banned
  drm/i915: Move a few more utility macros to i915_utils.h
  drm/i915: Clear ret before unbinding in i915_gem_evict_something()
  drm/i915/guc: Exclude the upper end of the Global GTT for the GuC
  drm/i915: Move a few utility macros into a separate header
  drm/i915/execlists: Reorder execlists register enabling
  drm/i915: Assert that we do create the deferred context
  drm/i915: Assert all timeline requests are gone before fini
  drm/i915: Revoke fenced GTT mmapings across GPU reset
  drm/i915: enable FBC on gen9+ too
  drm/i915: actually drive the BDW reserved IDs
  ...
      5c37daf5
  3. 09 1月, 2017 13 次提交
  5. 08 1月, 2017 4 次提交
    • J
      mm: workingset: fix use-after-free in shadow node shrinker · ea07b862
      由 Johannes Weiner 提交于 
      Several people report seeing warnings about inconsistent radix tree
nodes followed by crashes in the workingset code, which all looked like
use-after-free access from the shadow node shrinker.

Dave Jones managed to reproduce the issue with a debug patch applied,
which confirmed that the radix tree shrinking indeed frees shadow nodes
while they are still linked to the shadow LRU:

  WARNING: CPU: 2 PID: 53 at lib/radix-tree.c:643 delete_node+0x1e4/0x200
  CPU: 2 PID: 53 Comm: kswapd0 Not tainted 4.10.0-rc2-think+ #3
  Call Trace:
     delete_node+0x1e4/0x200
     __radix_tree_delete_node+0xd/0x10
     shadow_lru_isolate+0xe6/0x220
     __list_lru_walk_one.isra.4+0x9b/0x190
     list_lru_walk_one+0x23/0x30
     scan_shadow_nodes+0x2e/0x40
     shrink_slab.part.44+0x23d/0x5d0
     shrink_node+0x22c/0x330
     kswapd+0x392/0x8f0

This is the WARN_ON_ONCE(!list_empty(&node->private_list)) placed in the
inlined radix_tree_shrink().

The problem is with 14b46879 ("mm: workingset: move shadow entry
tracking to radix tree exceptional tracking"), which passes an update
callback into the radix tree to link and unlink shadow leaf nodes when
tree entries change, but forgot to pass the callback when reclaiming a
shadow node.

While the reclaimed shadow node itself is unlinked by the shrinker, its
deletion from the tree can cause the left-most leaf node in the tree to
be shrunk.  If that happens to be a shadow node as well, we don't unlink
it from the LRU as we should.

Consider this tree, where the s are shadow entries:

       root->rnode
            |
       [0       n]
        |       |
     [s    ] [sssss]

Now the shadow node shrinker reclaims the rightmost leaf node through
the shadow node LRU:

       root->rnode
            |
       [0        ]
        |
    [s     ]

Because the parent of the deleted node is the first level below the
root and has only one child in the left-most slot, the intermediate
level is shrunk and the node containing the single shadow is put in
its place:

       root->rnode
            |
       [s        ]

The shrinker again sees a single left-most slot in a first level node
and thus decides to store the shadow in root->rnode directly and free
the node - which is a leaf node on the shadow node LRU.

  root->rnode
       |
       s

Without the update callback, the freed node remains on the shadow LRU,
where it causes later shrinker runs to crash.

Pass the node updater callback into __radix_tree_delete_node() in case
the deletion causes the left-most branch in the tree to collapse too.

Also add warnings when linked nodes are freed right away, rather than
wait for the use-after-free when the list is scanned much later.

Fixes: 14b46879 ("mm: workingset: move shadow entry tracking to radix tree exceptional tracking")
Reported-by: NDave Chinner <david@fromorbit.com>
Reported-by: NHugh Dickins <hughd@google.com>
Reported-by: NAndrea Arcangeli <aarcange@redhat.com>
Reported-and-tested-by: NDave Jones <davej@codemonkey.org.uk>
Signed-off-by: NJohannes Weiner <hannes@cmpxchg.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Chris Leech <cleech@redhat.com>
Cc: Lee Duncan <lduncan@suse.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Matthew Wilcox <mawilcox@linuxonhyperv.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      ea07b862
    • H
      mm: stop leaking PageTables · b0b9b3df
      由 Hugh Dickins 提交于 
      4.10-rc loadtest (even on x86, and even without THPCache) fails with
"fork: Cannot allocate memory" or some such; and /proc/meminfo shows
PageTables growing.

Commit 953c66c2 ("mm: THP page cache support for ppc64") that got
merged in rc1 removed the freeing of an unused preallocated pagetable
after do_fault_around() has called map_pages().

This is usually a good optimization, so that the followup doesn't have
to reallocate one; but it's not sufficient to shift the freeing into
alloc_set_pte(), since there are failure cases (most commonly
VM_FAULT_RETRY) which never reach finish_fault().

Check and free it at the outer level in do_fault(), then we don't need
to worry in alloc_set_pte(), and can restore that to how it was (I
cannot find any reason to pte_free() under lock as it was doing).

And fix a separate pagetable leak, or crash, introduced by the same
change, that could only show up on some ppc64: why does do_set_pmd()'s
failure case attempt to withdraw a pagetable when it never deposited
one, at the same time overwriting (so leaking) the vmf->prealloc_pte?
Residue of an earlier implementation, perhaps? Delete it.

Fixes: 953c66c2 ("mm: THP page cache support for ppc64")
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Michael Neuling <mikey@neuling.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: NHugh Dickins <hughd@google.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      b0b9b3df
    • L
      Merge branch 'rc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild · 87bc6107
      由 Linus Torvalds 提交于 
      Pull kbuild fix from Michal Marek:
 "The asm-prototypes.h file added in the last merge window results in
  invalid code with CONFIG_KMEMCHECK=y. The net result is that genksyms
  segfaults.

  This pull request fixes the header, the genksyms fix is in my kbuild
  branch for 4.11"

* 'rc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild:
  asm-prototypes: Clear any CPP defines before declaring the functions
      87bc6107
    • G
      MAINTAINERS: add greybus subsystem mailing list · 01d0f715
      由 Greg Kroah-Hartman 提交于 
      The Greybus driver subsystem has a mailing list, so list it in the
MAINTAINERS file so that people know to send patches there as well.
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: NJohan Hovold <johan@kernel.org>
Reviewed-by: NViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      01d0f715
  7. 07 1月, 2017 19 次提交
  9. 06 1月, 2017 1 次提交