perf_event_comm() assumes that set_task_comm() is only called on
exec(), and in particular that its only called on current.

Neither are true, as Dave reported a WARN triggered by set_task_comm()
being called on !current.

Separate the exec() hook from the comm hook.
Reported-by: NDave Jones <davej@redhat.com>
Signed-off-by: NPeter Zijlstra <peterz@infradead.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-fsdevel@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/20140521153219.GH5226@laptop.programming.kicks-ass.net
[ Build fix. ]
Signed-off-by: NIngo Molnar <mingo@kernel.org>

This patch introduces new branch filter PERF_SAMPLE_BRANCH_COND which
will extend the existing perf ABI. This will filter branches which are
conditional. Various architectures can provide this functionality either
with HW filtering support (if present) or with SW filtering of captured
branch instructions.
Signed-off-by: NAnshuman Khandual <khandual@linux.vnet.ibm.com>
Reviewed-by: NStephane Eranian <eranian@google.com>
Reviewed-by: NAndi Kleen <ak@linux.intel.com>
Signed-off-by: NPeter Zijlstra <peterz@infradead.org>
Cc: mpe@ellerman.id.au
Cc: benh@kernel.crashing.org
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/1400743210-32289-1-git-send-email-khandual@linux.vnet.ibm.comSigned-off-by: NIngo Molnar <mingo@kernel.org>

Add common code to generate -ENOTSUPP at event creation time if an
architecture attempts to create a sampled event and
PERF_PMU_NO_INTERRUPT is set.

This adds a new pmu->capabilities flag.  Initially we only support
PERF_PMU_NO_INTERRUPT (to indicate a PMU has no support for generating
hardware interrupts) but there are other capabilities that can be
added later.
Signed-off-by: NVince Weaver <vincent.weaver@maine.edu>
Acked-by: NWill Deacon <will.deacon@arm.com>
[peterz: rename to PERF_PMU_CAP_* and moved the pmu::capabilities word into a hole]
Signed-off-by: NPeter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/alpine.DEB.2.10.1405161708060.11099@vincent-weaver-1.umelst.maine.eduSigned-off-by: NIngo Molnar <mingo@kernel.org>
Signed-off-by: NIngo Molnar <mingo@kernel.org>

This patch adds Qualcomm amba vendor Id to the list. This ID is used in mmci driver. The ID selected in same lines like 0x41 is "A" for ARM, 0x51 is "Q" for Qualcomm.

As there are no physical register on Qcom SOC for amba vendor id, this is a fake ID assigned based on "Q" prefix from Qualcomm.
Signed-off-by: NSrinivas Kandagatla <srinivas.kandagatla@linaro.org>
Acked-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

In commit ad86622b ("wait: swap EXIT_ZOMBIE and EXIT_DEAD to hide
EXIT_TRACE from user-space") the order of task state definitions were
changed: EXIT_DEAD and EXIT_ZOMBIE were swapped.  Though the charterers
for the states in TASK_STATE_TO_CHAR_STR string were not updated.  This
patch synchronizes the string to the order of definitions.
Signed-off-by: NMasatake YAMATO <yamato@redhat.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Missing a "|" in AUDIT_ARCH_MIPSEL64N32 macro definition.
Signed-off-by: NHuacai Chen <chenhc@lemote.com>
Reviewed-by: NMarkos Chandras <markos.chandras@imgtec.com>
Cc: John Crispin <john@phrozen.org>
Cc: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang <zhangfx@lemote.com>
Cc: Zhangjin Wu <wuzhangjin@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/6978/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

The count which is used to get_unmap_data maybe not the same as the
count computed in dmaengine_unmap which causes to free data in a
wrong pool.

This patch fixes this issue by keeping the map count with unmap_data
structure and use this count to get the pool.

Cc: <stable@vger.kernel.org>
Signed-off-by: NXuelin Shi <xuelin.shi@freescale.com>
Signed-off-by: NDan Williams <dan.j.williams@intel.com>

It is not possible to reference the omap_dma_filter_fn filter
function from a built-in driver if the dmaengine driver itself
is a loadable module, which is a valid configuration otherwise.

This provides only the dummy alternative if the function
is referenced by a built-in driver to allow a successful
build. The filter function is only required by ATAGS based
platforms, which will continue to be broken after this change
for the bogus configuration. When booting from DT, with the
dma channels correctly listed there, it will work fine.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Acked-by: NTony Lindgren <tony@atomide.com>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: Vinod Koul <vinod.koul@intel.com>
Cc: dmaengine@vger.kernel.org
Signed-off-by: NVinod Koul <vinod.koul@intel.com>

The new function vlan_get_encap_level() uses vlan_dev_priv()
which is only conditionally avaialble when VLAN support is
enabled.  Make vlan_get_encap_level() conditionally available
as well.

Fixes: 44a40855 ("bonding: Fix stacked device detection in arp monitoring")
Reported-by: NStephen Rothwell <sfr@canb.auug.org.au>
CC: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: NVlad Yasevich <vyasevic@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Add the renameat2 syscall to the generic syscall list, which is used by the
following architectures: arc, arm64, c6x, hexagon, metag, openrisc, score,
tile, unicore32.
Signed-off-by: NJames Hogan <james.hogan@imgtec.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NMiklos Szeredi <mszeredi@suse.cz>
Cc: linux-arch@vger.kernel.org
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Mark Salter <msalter@redhat.com>
Cc: Aurelien Jacquiot <a-jacquiot@ti.com>
Cc: Richard Kuo <rkuo@codeaurora.org>
Cc: linux-hexagon@vger.kernel.org
Cc: linux-metag@vger.kernel.org
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Chen Liqin <liqin.linux@gmail.com>
Cc: Lennox Wu <lennox.wu@gmail.com>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>

Vince noticed that we test the (unsigned long) flags field against an
(unsigned int) constant. This would allow setting the high bits on 64bit
platforms and not get an error.

There is nothing that uses the high bits, so it should be entirely
harmless, but we don't want userspace to accidentally set them anyway,
so fix the constants.

Cc: Ingo Molnar <mingo@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Reported-by: NVince Weaver <vincent.weaver@maine.edu>
Tested-by: NVince Weaver <vincent.weaver@maine.edu>
Signed-off-by: NPeter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20140423102254.GL11096@twins.programming.kicks-ass.netSigned-off-by: NThomas Gleixner <tglx@linutronix.de>

Alexander noticed that we use RCU iteration on rb->event_list but do
not use list_{add,del}_rcu() to add,remove entries to that list, nor
do we observe proper grace periods when re-using the entries.

Merge ring_buffer_detach() into ring_buffer_attach() such that
attaching to the NULL buffer is detaching.

Furthermore, ensure that between any 'detach' and 'attach' of the same
event we observe the required grace period, but only when strictly
required. In effect this means that only ioctl(.request =
PERF_EVENT_IOC_SET_OUTPUT) will wait for a grace period, while the
normal initial attach and final detach will not be delayed.

This patch should, I think, do the right thing under all
circumstances, the 'normal' cases all should never see the extra grace
period, but the two cases:

 1) PERF_EVENT_IOC_SET_OUTPUT on an event which already has a
    ring_buffer set, will now observe the required grace period between
    removing itself from the old and attaching itself to the new buffer.

    This case is 'simple' in that both buffers are present in
    perf_event_set_output() one could think an unconditional
    synchronize_rcu() would be sufficient; however...

 2) an event that has a buffer attached, the buffer is destroyed
    (munmap) and then the event is attached to a new/different buffer
    using PERF_EVENT_IOC_SET_OUTPUT.

    This case is more complex because the buffer destruction does:
      ring_buffer_attach(.rb = NULL)
    followed by the ioctl() doing:
      ring_buffer_attach(.rb = foo);

    and we still need to observe the grace period between these two
    calls due to us reusing the event->rb_entry list_head.

In order to make 2 happen we use Paul's latest cond_synchronize_rcu()
call.

Cc: Paul Mackerras <paulus@samba.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Reported-by: NAlexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: NPeter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20140507123526.GD13658@twins.programming.kicks-ass.netSigned-off-by: NThomas Gleixner <tglx@linutronix.de>

Prior to commit fbd929f2
	bonding: support QinQ for bond arp interval

the arp monitoring code allowed for proper detection of devices
stacked on top of vlans.  Since the above commit, the
code can still detect a device stacked on top of single
vlan, but not a device stacked on top of Q-in-Q configuration.
The search will only set the inner vlan tag if the route
device is the vlan device.  However, this is not always the
case, as it is possible to extend the stacked configuration.

With this patch it is possible to provision devices on
top Q-in-Q vlan configuration that should be used as
a source of ARP monitoring information.

For example:
ip link add link bond0 vlan10 type vlan proto 802.1q id 10
ip link add link vlan10 vlan100 type vlan proto 802.1q id 100
ip link add link vlan100 type macvlan

Note:  This patch limites the number of stacked VLANs to 2,
just like before.  The original, however had another issue
in that if we had more then 2 levels of VLANs, we would end
up generating incorrectly tagged traffic.  This is no longer
possible.

Fixes: fbd929f2 (bonding: support QinQ for bond arp interval)
CC: Jay Vosburgh <j.vosburgh@gmail.com>
CC: Veaceslav Falico <vfalico@redhat.com>
CC: Andy Gospodarek <andy@greyhouse.net>
CC: Ding Tianhong <dingtianhong@huawei.com>
CC: Patric McHardy <kaber@trash.net>
Signed-off-by: NVlad Yasevich <vyasevic@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Macvlan devices try to avoid stacking, but that's not always
successfull or even desired.  As an example, the following
configuration is perefectly legal and valid:

eth0 <--- macvlan0 <---- vlan0.10 <--- macvlan1

However, this configuration produces the following lockdep
trace:
[  115.620418] ======================================================
[  115.620477] [ INFO: possible circular locking dependency detected ]
[  115.620516] 3.15.0-rc1+ #24 Not tainted
[  115.620540] -------------------------------------------------------
[  115.620577] ip/1704 is trying to acquire lock:
[  115.620604]  (&vlan_netdev_addr_lock_key/1){+.....}, at: [<ffffffff815df49c>] dev_uc_sync+0x3c/0x80
[  115.620686]
but task is already holding lock:
[  115.620723]  (&macvlan_netdev_addr_lock_key){+.....}, at: [<ffffffff815da5be>] dev_set_rx_mode+0x1e/0x40
[  115.620795]
which lock already depends on the new lock.

[  115.620853]
the existing dependency chain (in reverse order) is:
[  115.620894]
-> #1 (&macvlan_netdev_addr_lock_key){+.....}:
[  115.620935]        [<ffffffff810d57f2>] lock_acquire+0xa2/0x130
[  115.620974]        [<ffffffff816f62e7>] _raw_spin_lock_nested+0x37/0x50
[  115.621019]        [<ffffffffa07296c3>] vlan_dev_set_rx_mode+0x53/0x110 [8021q]
[  115.621066]        [<ffffffff815da557>] __dev_set_rx_mode+0x57/0xa0
[  115.621105]        [<ffffffff815da5c6>] dev_set_rx_mode+0x26/0x40
[  115.621143]        [<ffffffff815da6be>] __dev_open+0xde/0x140
[  115.621174]        [<ffffffff815da9ad>] __dev_change_flags+0x9d/0x170
[  115.621174]        [<ffffffff815daaa9>] dev_change_flags+0x29/0x60
[  115.621174]        [<ffffffff815e7f11>] do_setlink+0x321/0x9a0
[  115.621174]        [<ffffffff815ea59f>] rtnl_newlink+0x51f/0x730
[  115.621174]        [<ffffffff815e6e75>] rtnetlink_rcv_msg+0x95/0x250
[  115.621174]        [<ffffffff81608b19>] netlink_rcv_skb+0xa9/0xc0
[  115.621174]        [<ffffffff815e6dca>] rtnetlink_rcv+0x2a/0x40
[  115.621174]        [<ffffffff81608150>] netlink_unicast+0xf0/0x1c0
[  115.621174]        [<ffffffff8160851f>] netlink_sendmsg+0x2ff/0x740
[  115.621174]        [<ffffffff815bc9db>] sock_sendmsg+0x8b/0xc0
[  115.621174]        [<ffffffff815bd4b9>] ___sys_sendmsg+0x369/0x380
[  115.621174]        [<ffffffff815bdbb2>] __sys_sendmsg+0x42/0x80
[  115.621174]        [<ffffffff815bdc02>] SyS_sendmsg+0x12/0x20
[  115.621174]        [<ffffffff816ffd69>] system_call_fastpath+0x16/0x1b
[  115.621174]
-> #0 (&vlan_netdev_addr_lock_key/1){+.....}:
[  115.621174]        [<ffffffff810d4d43>] __lock_acquire+0x1773/0x1a60
[  115.621174]        [<ffffffff810d57f2>] lock_acquire+0xa2/0x130
[  115.621174]        [<ffffffff816f62e7>] _raw_spin_lock_nested+0x37/0x50
[  115.621174]        [<ffffffff815df49c>] dev_uc_sync+0x3c/0x80
[  115.621174]        [<ffffffffa0696d2a>] macvlan_set_mac_lists+0xca/0x110 [macvlan]
[  115.621174]        [<ffffffff815da557>] __dev_set_rx_mode+0x57/0xa0
[  115.621174]        [<ffffffff815da5c6>] dev_set_rx_mode+0x26/0x40
[  115.621174]        [<ffffffff815da6be>] __dev_open+0xde/0x140
[  115.621174]        [<ffffffff815da9ad>] __dev_change_flags+0x9d/0x170
[  115.621174]        [<ffffffff815daaa9>] dev_change_flags+0x29/0x60
[  115.621174]        [<ffffffff815e7f11>] do_setlink+0x321/0x9a0
[  115.621174]        [<ffffffff815ea59f>] rtnl_newlink+0x51f/0x730
[  115.621174]        [<ffffffff815e6e75>] rtnetlink_rcv_msg+0x95/0x250
[  115.621174]        [<ffffffff81608b19>] netlink_rcv_skb+0xa9/0xc0
[  115.621174]        [<ffffffff815e6dca>] rtnetlink_rcv+0x2a/0x40
[  115.621174]        [<ffffffff81608150>] netlink_unicast+0xf0/0x1c0
[  115.621174]        [<ffffffff8160851f>] netlink_sendmsg+0x2ff/0x740
[  115.621174]        [<ffffffff815bc9db>] sock_sendmsg+0x8b/0xc0
[  115.621174]        [<ffffffff815bd4b9>] ___sys_sendmsg+0x369/0x380
[  115.621174]        [<ffffffff815bdbb2>] __sys_sendmsg+0x42/0x80
[  115.621174]        [<ffffffff815bdc02>] SyS_sendmsg+0x12/0x20
[  115.621174]        [<ffffffff816ffd69>] system_call_fastpath+0x16/0x1b
[  115.621174]
other info that might help us debug this:

[  115.621174]  Possible unsafe locking scenario:

[  115.621174]        CPU0                    CPU1
[  115.621174]        ----                    ----
[  115.621174]   lock(&macvlan_netdev_addr_lock_key);
[  115.621174]                                lock(&vlan_netdev_addr_lock_key/1);
[  115.621174]                                lock(&macvlan_netdev_addr_lock_key);
[  115.621174]   lock(&vlan_netdev_addr_lock_key/1);
[  115.621174]
 *** DEADLOCK ***

[  115.621174] 2 locks held by ip/1704:
[  115.621174]  #0:  (rtnl_mutex){+.+.+.}, at: [<ffffffff815e6dbb>] rtnetlink_rcv+0x1b/0x40
[  115.621174]  #1:  (&macvlan_netdev_addr_lock_key){+.....}, at: [<ffffffff815da5be>] dev_set_rx_mode+0x1e/0x40
[  115.621174]
stack backtrace:
[  115.621174] CPU: 3 PID: 1704 Comm: ip Not tainted 3.15.0-rc1+ #24
[  115.621174] Hardware name: Hewlett-Packard HP xw8400 Workstation/0A08h, BIOS 786D5 v02.38 10/25/2010
[  115.621174]  ffffffff82339ae0 ffff880465f79568 ffffffff816ee20c ffffffff82339ae0
[  115.621174]  ffff880465f795a8 ffffffff816e9e1b ffff880465f79600 ffff880465b019c8
[  115.621174]  0000000000000001 0000000000000002 ffff880465b019c8 ffff880465b01230
[  115.621174] Call Trace:
[  115.621174]  [<ffffffff816ee20c>] dump_stack+0x4d/0x66
[  115.621174]  [<ffffffff816e9e1b>] print_circular_bug+0x200/0x20e
[  115.621174]  [<ffffffff810d4d43>] __lock_acquire+0x1773/0x1a60
[  115.621174]  [<ffffffff810d3172>] ? trace_hardirqs_on_caller+0xb2/0x1d0
[  115.621174]  [<ffffffff810d57f2>] lock_acquire+0xa2/0x130
[  115.621174]  [<ffffffff815df49c>] ? dev_uc_sync+0x3c/0x80
[  115.621174]  [<ffffffff816f62e7>] _raw_spin_lock_nested+0x37/0x50
[  115.621174]  [<ffffffff815df49c>] ? dev_uc_sync+0x3c/0x80
[  115.621174]  [<ffffffff815df49c>] dev_uc_sync+0x3c/0x80
[  115.621174]  [<ffffffffa0696d2a>] macvlan_set_mac_lists+0xca/0x110 [macvlan]
[  115.621174]  [<ffffffff815da557>] __dev_set_rx_mode+0x57/0xa0
[  115.621174]  [<ffffffff815da5c6>] dev_set_rx_mode+0x26/0x40
[  115.621174]  [<ffffffff815da6be>] __dev_open+0xde/0x140
[  115.621174]  [<ffffffff815da9ad>] __dev_change_flags+0x9d/0x170
[  115.621174]  [<ffffffff815daaa9>] dev_change_flags+0x29/0x60
[  115.621174]  [<ffffffff811e1db1>] ? mem_cgroup_bad_page_check+0x21/0x30
[  115.621174]  [<ffffffff815e7f11>] do_setlink+0x321/0x9a0
[  115.621174]  [<ffffffff810d394c>] ? __lock_acquire+0x37c/0x1a60
[  115.621174]  [<ffffffff815ea59f>] rtnl_newlink+0x51f/0x730
[  115.621174]  [<ffffffff815ea169>] ? rtnl_newlink+0xe9/0x730
[  115.621174]  [<ffffffff815e6e75>] rtnetlink_rcv_msg+0x95/0x250
[  115.621174]  [<ffffffff810d329d>] ? trace_hardirqs_on+0xd/0x10
[  115.621174]  [<ffffffff815e6dbb>] ? rtnetlink_rcv+0x1b/0x40
[  115.621174]  [<ffffffff815e6de0>] ? rtnetlink_rcv+0x40/0x40
[  115.621174]  [<ffffffff81608b19>] netlink_rcv_skb+0xa9/0xc0
[  115.621174]  [<ffffffff815e6dca>] rtnetlink_rcv+0x2a/0x40
[  115.621174]  [<ffffffff81608150>] netlink_unicast+0xf0/0x1c0
[  115.621174]  [<ffffffff8160851f>] netlink_sendmsg+0x2ff/0x740
[  115.621174]  [<ffffffff815bc9db>] sock_sendmsg+0x8b/0xc0
[  115.621174]  [<ffffffff8119d4af>] ? might_fault+0x5f/0xb0
[  115.621174]  [<ffffffff8119d4f8>] ? might_fault+0xa8/0xb0
[  115.621174]  [<ffffffff8119d4af>] ? might_fault+0x5f/0xb0
[  115.621174]  [<ffffffff815cb51e>] ? verify_iovec+0x5e/0xe0
[  115.621174]  [<ffffffff815bd4b9>] ___sys_sendmsg+0x369/0x380
[  115.621174]  [<ffffffff816faa0d>] ? __do_page_fault+0x11d/0x570
[  115.621174]  [<ffffffff810cfe9f>] ? up_read+0x1f/0x40
[  115.621174]  [<ffffffff816fab04>] ? __do_page_fault+0x214/0x570
[  115.621174]  [<ffffffff8120a10b>] ? mntput_no_expire+0x6b/0x1c0
[  115.621174]  [<ffffffff8120a0b7>] ? mntput_no_expire+0x17/0x1c0
[  115.621174]  [<ffffffff8120a284>] ? mntput+0x24/0x40
[  115.621174]  [<ffffffff815bdbb2>] __sys_sendmsg+0x42/0x80
[  115.621174]  [<ffffffff815bdc02>] SyS_sendmsg+0x12/0x20
[  115.621174]  [<ffffffff816ffd69>] system_call_fastpath+0x16/0x1b

Fix this by correctly providing macvlan lockdep class.
Signed-off-by: NVlad Yasevich <vyasevic@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This reverts commit dc8eaaa0.
	vlan: Fix lockdep warning when vlan dev handle notification

Instead we use the new new API to find the lock subclass of
our vlan device.  This way we can support configurations where
vlans are interspersed with other devices:
  bond -> vlan -> macvlan -> vlan
Signed-off-by: NVlad Yasevich <vyasevic@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Currently netif_addr_lock_nested assumes that there can be only
a single nesting level between 2 devices.  However, if we
have multiple devices of the same type stacked, this fails.
For example:
 eth0 <-- vlan0.10 <-- vlan0.10.20

A more complicated configuration may stack more then one type of
device in different order.
Ex:
  eth0 <-- vlan0.10 <-- macvlan0 <-- vlan1.10.20 <-- macvlan1

This patch adds an ndo_* function that allows each stackable
device to report its nesting level.  If the device doesn't
provide this function default subclass of 1 is used.
Signed-off-by: NVlad Yasevich <vyasevic@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Multiple devices in the kernel can be stacked/nested and they
need to know their nesting level for the purposes of lockdep.
This patch provides a generic function that determines a nesting
level of a particular device by its type (ex: vlan, macvlan, etc).
We only care about nesting of the same type of devices.

For example:
  eth0 <- vlan0.10 <- macvlan0 <- vlan1.20

The nesting level of vlan1.20 would be 1, since there is another vlan
in the stack under it.
Signed-off-by: NVlad Yasevich <vyasevic@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This patch adds UPDATE_QP SRIOV wrapper support.

The mechanism is a general one, but currently only source MAC
index changes are allowed for VFs.
Signed-off-by: NMatan Barak <matanb@mellanox.com>
Signed-off-by: NOr Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

RFC 4861 states in 7.2.5:

	The IsRouter flag in the cache entry MUST be set based on the
         Router flag in the received advertisement.  In those cases
         where the IsRouter flag changes from TRUE to FALSE as a result
         of this update, the node MUST remove that router from the
         Default Router List and update the Destination Cache entries
         for all destinations using that neighbor as a router as
         specified in Section 7.3.3.  This is needed to detect when a
         node that is used as a router stops forwarding packets due to
         being configured as a host.

Currently, when dealing with NA Message which IsRouter flag changes from
TRUE to FALSE, the kernel only removes router from the Default Router List,
and don't update the Destination Cache entries.

Now in order to update those Destination Cache entries, i introduce
function rt6_clean_tohost().
Signed-off-by: NDuan Jiong <duanj.fnst@cn.fujitsu.com>
Acked-by: NHannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

From: Cong Wang <cwang@twopensource.com>

commit 50624c93 (net: Delay default_device_exit_batch until no
devices are unregistering) introduced rtnl_lock_unregistering() for
default_device_exit_batch(). Same race could happen we when rmmod a driver
which calls rtnl_link_unregister() as we call dev->destructor without rtnl
lock.

For long term, I think we should clean up the mess of netdev_run_todo()
and net namespce exit code.

Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: NCong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: NCong Wang <cwang@twopensource.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Make the CONFIG_OF=n prototpe of of_node_full_name() mateh the CONFIG_OF=y
version.

Fixes compile warnings like this:

sound/soc/soc-core.c: In function 'soc_check_aux_dev':
sound/soc/soc-core.c:1667:3: warning: passing argument 1 of 'of_node_full_name' discards 'const' qualifier from pointer target type [enabled by default]
   codecname = of_node_full_name(aux_dev->codec_of_node);

when CONFIG_OF is not defined.
Signed-off-by: NStephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: NGrant Likely <grant.likely@linaro.org>

_STK_LIM_MAX could be used to override the RLIMIT_STACK hard limit from
an arch's include/uapi/asm-generic/resource.h file, but is no longer
used since both parisc and metag removed the override. Therefore remove
it entirely, setting the hard RLIMIT_STACK limit to RLIM_INFINITY
directly in include/asm-generic/resource.h.
Signed-off-by: NJames Hogan <james.hogan@imgtec.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: linux-arch@vger.kernel.org
Cc: Helge Deller <deller@gmx.de>
Cc: John David Anglin <dave.anglin@bell.net>

If the probed insn triggers a trap, ->si_addr = regs->ip is technically
correct, but this is not what the signal handler wants; we need to pass
the address of the probed insn, not the address of xol slot.

Add the new arch-agnostic helper, uprobe_get_trap_addr(), and change
fill_trap_info() and math_error() to use it. !CONFIG_UPROBES case in
uprobes.h uses a macro to avoid include hell and ensure that it can be
compiled even if an architecture doesn't define instruction_pointer().

Test-case:

	#include <signal.h>
	#include <stdio.h>
	#include <unistd.h>

	extern void probe_div(void);

	void sigh(int sig, siginfo_t *info, void *c)
	{
		int passed = (info->si_addr == probe_div);
		printf(passed ? "PASS\n" : "FAIL\n");
		_exit(!passed);
	}

	int main(void)
	{
		struct sigaction sa = {
			.sa_sigaction	= sigh,
			.sa_flags	= SA_SIGINFO,
		};

		sigaction(SIGFPE, &sa, NULL);

		asm (
			"xor %ecx,%ecx\n"
			".globl probe_div; probe_div:\n"
			"idiv %ecx\n"
		);

		return 0;
	}

it fails if probe_div() is probed.

Note: show_unhandled_signals users should probably use this helper too,
but we need to cleanup them first.
Signed-off-by: NOleg Nesterov <oleg@redhat.com>
Reviewed-by: NMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>

net_get_random_once depends on the static keys infrastructure to patch up
the branch to the slow path during boot. This was realized by abusing the
static keys api and defining a new initializer to not enable the call
site while still indicating that the branch point should get patched
up. This was needed to have the fast path considered likely by gcc.

The static key initialization during boot up normally walks through all
the registered keys and either patches in ideal nops or enables the jump
site but omitted that step on x86 if ideal nops where already placed at
static_key branch points. Thus net_get_random_once branches not always
became active.

This patch switches net_get_random_once to the ordinary static_key
api and thus places the kernel fast path in the - by gcc considered -
unlikely path.  Microbenchmarks on Intel and AMD x86-64 showed that
the unlikely path actually beats the likely path in terms of cycle cost
and that different nop patterns did not make much difference, thus this
switch should not be noticeable.

Fixes: a48e4292 ("net: introduce new macro net_get_random_once")
Reported-by: NTuomas Räsänen <tuomasjjrasanen@tjjr.fi>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: NHannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

A MIPS64 kernel may support ELF files for all 3 MIPS ABIs
(O32, N32, N64). Furthermore, the AUDIT_ARCH_MIPS{,EL}64 token
does not provide enough information about the ABI for the 64-bit
process. As a result of which, userland needs to use complex
seccomp filters to decide whether a syscall belongs to the o32 or n32
or n64 ABI. Therefore, a new arch token for MIPS64/n32 is added so it
can be used by seccomp to explicitely set syscall filters for this ABI.
Signed-off-by: NMarkos Chandras <markos.chandras@imgtec.com>
Acked-by: NEric Paris <eparis@redhat.com>
Acked-by: NPaul Moore <pmoore@redhat.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: linux-mips@linux-mips.org
Link: http://sourceforge.net/p/libseccomp/mailman/message/32239040/
Patchwork: https://patchwork.linux-mips.org/patch/6818/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Determining the css of a task usually requires RCU read lock as that's
the only thing which keeps the returned css accessible till its
reference is acquired; however, testing whether a task belongs to the
root can be performed without dereferencing the returned css by
comparing the returned pointer against the root one in init_css_set[]
which never changes.

Implement task_css_is_root() which can be invoked in any context.
This will be used by the scheduled cgroup_freezer change.

v2: cgroup no longer supports modular controllers.  No need to export
    init_css_set.  Pointed out by Li.
Signed-off-by: NTejun Heo <tj@kernel.org>
Acked-by: NLi Zefan <lizefan@huawei.com>

My commit removing that also removed it from the header file
which can break compilation of userspace that needed it, add
it back for API/ABI compatibility purposes (but no code to
implement anything for it.)
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

The kernfs open method - kernfs_fop_open() - inherited extra
permission checks from sysfs.  While the vfs layer allows ignoring the
read/write permissions checks if the issuer has CAP_DAC_OVERRIDE,
sysfs explicitly denied open regardless of the cap if the file doesn't
have any of the UGO perms of the requested access or doesn't implement
the requested operation.  It can be debated whether this was a good
idea or not but the behavior is too subtle and dangerous to change at
this point.

After cgroup got converted to kernfs, this extra perm check also got
applied to cgroup breaking libcgroup which opens write-only files with
O_RDWR as root.  This patch gates the extra open permission check with
a new flag KERNFS_ROOT_EXTRA_OPEN_PERM_CHECK and enables it for sysfs.
For sysfs, nothing changes.  For cgroup, root now can perform any
operation regardless of the permissions as it was before kernfs
conversion.  Note that kernfs still fails unimplemented operations
with -EINVAL.

While at it, add comments explaining KERNFS_ROOT flags.
Signed-off-by: NTejun Heo <tj@kernel.org>
Reported-by: NAndrey Wagin <avagin@gmail.com>
Tested-by: NAndrey Wagin <avagin@gmail.com>
Cc: Li Zefan <lizefan@huawei.com>
References: http://lkml.kernel.org/g/CANaxB-xUm3rJ-Cbp72q-rQJO5mZe1qK6qXsQM=vh0U8upJ44+A@mail.gmail.com
Fixes: 2bd59d48 ("cgroup: convert to kernfs")
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Similarly, when CONFIG_SYSCTL is not set, ping_group_range should still
work, just that no one can change it. Therefore we should move it out of
sysctl_net_ipv4.c. And, it should not share the same seqlock with
ip_local_port_range.

BTW, rename it to ->ping_group_range instead.

Cc: David S. Miller <davem@davemloft.net>
Cc: Francois Romieu <romieu@fr.zoreil.com>
Reported-by: NStefan de Konink <stefan@konink.de>
Signed-off-by: NCong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

When CONFIG_SYSCTL is not set, ip_local_port_range should still work,
just that no one can change it. Therefore we should move it out of sysctl_inet.c.
Also, rename it to ->ip_local_ports instead.

Cc: David S. Miller <davem@davemloft.net>
Cc: Francois Romieu <romieu@fr.zoreil.com>
Reported-by: NStefan de Konink <stefan@konink.de>
Signed-off-by: NCong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The replacement of the 'count' variable by two variables 'incs' and
'decs' to resolve some race conditions during module unloading was done
in parallel with some cleanup in the trace subsystem, and was integrated
as a merge.

Unfortunately, the formula for this replacement was wrong in the tracing
code, and the refcount in the traces was not usable as a result.

Use 'count = incs - decs' to compute the user count.

Link: http://lkml.kernel.org/p/1393924179-9147-1-git-send-email-romain.izard.pro@gmail.comAcked-by: NIngo Molnar <mingo@kernel.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: stable@vger.kernel.org # 2.6.35
Fixes: c1ab9cab "merge conflict resolution"
Signed-off-by: NRomain Izard <romain.izard.pro@gmail.com>
Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>

This reverts commit c42deffd.

commit <mmc: rtsx: add support for pre_req and post_req> did use
mutex_unlock() in tasklet, but mutex_unlock() can't be used in
tasklet(atomic context). The driver needs to use mutex to avoid
concurrency, so we can't use tasklet here, the patch need to be
removed.

The spinlock host->lock and pcr->lock may deadlock, one way to solve
the deadlock is remove host->lock in sd_isr_done_transfer(), but if
using workqueue the we can avoid using the spinlock and also avoid
the problem.
Signed-off-by: NMicky Ching <micky_ching@realsil.com.cn>
Acked-by: NUlf Hansson <ulf.hansson@linaro.org>
Signed-off-by: NLee Jones <lee.jones@linaro.org>

If CONFIG_OF is not set, make of_mdiobus_register() call
mdiobus_register() instead of returning -ENOSYS.

This way, we can just call of_mdiobus_register() from all DT-enabled
drivers to handle the compat cases.
Signed-off-by: NDaniel Mack <zonque@gmail.com>
Suggested-by: NFlorian Fainelli <f.fainelli@gmail.com>
Acked-by: NFlorian Fainelli <f.fainelli@gmail.com>
Acked-by: NMugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This reverts commit d2069403,
there are no more callers.
Signed-off-by: NFlorian Westphal <fw@strlen.de>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

ARC Linux (not supporting native unaligned access) was failing
to boot because __start_kprobe_blacklist was not aligned.

This was because per generated vmlinux.lds it was emitted right
next to .rodata with strings etc hence could be randomly
unaligned.

Fix that by ensuring a word alignment. While 4 would suffice for
32bit arches and problem at hand, it is probably better to put 8.

| Path: (null) CPU: 0 PID: 1 Comm: swapper Not tainted
| 3.15.0-rc3-next-20140430 #2
| task: 8f044000 ti: 8f01e000 task.ti: 8f01e000
|
| [ECR   ]: 0x00230400 => Misaligned r/w from 0x800fb0d3
| [EFA   ]: 0x800fb0d3
| [BLINK ]: do_one_initcall+0x86/0x1bc
| [ERET  ]: init_kprobes+0x52/0x120
Signed-off-by: NVineet Gupta <vgupta@synopsys.com>
Cc: <torvalds@linux-foundation.org>
Cc: <rusty@rustcorp.com.au>
Cc: <rdunlap@infradead.org>
Cc: <jeremy@goop.org>
Cc: <arnd@arndb.de>
Cc: <dl9pf@gmx.de>
Cc: <sparse@chrisli.org>
Cc: <anil.s.keshavamurthy@intel.com>
Cc: <davem@davemloft.net>
Cc: <ananth@in.ibm.com>
Cc: <masami.hiramatsu.pt@hitachi.com>
Cc: <chrisw@sous-sol.org>
Cc: <akataria@vmware.com>
Cc: anton Kolesov <Anton.Kolesov@synopsys.com>
Link: http://lkml.kernel.org/r/5361DB14.7010406@synopsys.comSigned-off-by: NIngo Molnar <mingo@kernel.org>

yield_task_dl() is broken:

 o it forces current to be throttled setting its runtime to zero;
 o it sets current's dl_se->dl_new to one, expecting that dl_task_timer()
   will queue it back with proper parameters at replenish time.

Unfortunately, dl_task_timer() has this check at the very beginning:

	if (!dl_task(p) || dl_se->dl_new)
		goto unlock;

So, it just bails out and the task is never replenished. It actually
yielded forever.

To fix this, introduce a new flag indicating that the task properly yielded
the CPU before its current runtime expired. While this is a little overdoing
at the moment, the flag would be useful in the future to discriminate between
"good" jobs (of which remaining runtime could be reclaimed, i.e. recycled)
and "bad" jobs (for which dl_throttled task has been set) that needed to be
stopped.
Reported-by: Nyjay.kim <yjay.kim@lge.com>
Signed-off-by: NJuri Lelli <juri.lelli@gmail.com>
Signed-off-by: NPeter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20140429103953.e68eba1b2ac3309214e3dc5a@gmail.comSigned-off-by: NIngo Molnar <mingo@kernel.org>

Patch 01f8fa4f "genirq: Allow forcing cpu affinity of interrupts" added
an irq_force_affinity() function, and 30ccf03b "clocksource: Exynos_mct:
Use irq_force_affinity() in cpu bringup" subsequently uses it. However, the
driver can be used with CONFIG_SMP disabled, but the function declaration
is only available for CONFIG_SMP, leading to this build error:

drivers/clocksource/exynos_mct.c:431:3: error: implicit declaration of function 'irq_force_affinity' [-Werror=implicit-function-declaration]
   irq_force_affinity(mct_irqs[MCT_L0_IRQ + cpu], cpumask_of(cpu));

This patch introduces a dummy helper function for the non-SMP case
that always returns success, to get rid of the build error.
Since the patches causing the problem are marked for stable backports,
this one should be as well.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Cc: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Acked-by: NKukjin Kim <kgene.kim@samsung.com>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/5619084.0zmrrIUZLV@wuerfelSigned-off-by: NThomas Gleixner <tglx@linutronix.de>

debugobjects warning during netfilter exit:

    ------------[ cut here ]------------
    WARNING: CPU: 6 PID: 4178 at lib/debugobjects.c:260 debug_print_object+0x8d/0xb0()
    ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x20
    Modules linked in:
    CPU: 6 PID: 4178 Comm: kworker/u16:2 Tainted: G        W 3.11.0-next-20130906-sasha #3984
    Workqueue: netns cleanup_net
    Call Trace:
      dump_stack+0x52/0x87
      warn_slowpath_common+0x8c/0xc0
      warn_slowpath_fmt+0x46/0x50
      debug_print_object+0x8d/0xb0
      __debug_check_no_obj_freed+0xa5/0x220
      debug_check_no_obj_freed+0x15/0x20
      kmem_cache_free+0x197/0x340
      kmem_cache_destroy+0x86/0xe0
      nf_conntrack_cleanup_net_list+0x131/0x170
      nf_conntrack_pernet_exit+0x5d/0x70
      ops_exit_list+0x5e/0x70
      cleanup_net+0xfb/0x1c0
      process_one_work+0x338/0x550
      worker_thread+0x215/0x350
      kthread+0xe7/0xf0
      ret_from_fork+0x7c/0xb0

Also during dcookie cleanup:

    WARNING: CPU: 12 PID: 9725 at lib/debugobjects.c:260 debug_print_object+0x8c/0xb0()
    ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x20
    Modules linked in:
    CPU: 12 PID: 9725 Comm: trinity-c141 Not tainted 3.15.0-rc2-next-20140423-sasha-00018-gc4ff6c4 #408
    Call Trace:
      dump_stack (lib/dump_stack.c:52)
      warn_slowpath_common (kernel/panic.c:430)
      warn_slowpath_fmt (kernel/panic.c:445)
      debug_print_object (lib/debugobjects.c:262)
      __debug_check_no_obj_freed (lib/debugobjects.c:697)
      debug_check_no_obj_freed (lib/debugobjects.c:726)
      kmem_cache_free (mm/slub.c:2689 mm/slub.c:2717)
      kmem_cache_destroy (mm/slab_common.c:363)
      dcookie_unregister (fs/dcookies.c:302 fs/dcookies.c:343)
      event_buffer_release (arch/x86/oprofile/../../../drivers/oprofile/event_buffer.c:153)
      __fput (fs/file_table.c:217)
      ____fput (fs/file_table.c:253)
      task_work_run (kernel/task_work.c:125 (discriminator 1))
      do_notify_resume (include/linux/tracehook.h:196 arch/x86/kernel/signal.c:751)
      int_signal (arch/x86/kernel/entry_64.S:807)

Sysfs has a release mechanism.  Use that to release the kmem_cache
structure if CONFIG_SYSFS is enabled.

Only slub is changed - slab currently only supports /proc/slabinfo and
not /sys/kernel/slab/*.  We talked about adding that and someone was
working on it.

[akpm@linux-foundation.org: fix CONFIG_SYSFS=n build]
[akpm@linux-foundation.org: fix CONFIG_SYSFS=n build even more]
Signed-off-by: NChristoph Lameter <cl@linux.com>
Reported-by: NSasha Levin <sasha.levin@oracle.com>
Tested-by: NSasha Levin <sasha.levin@oracle.com>
Acked-by: NGreg KH <greg@kroah.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Bart Van Assche <bvanassche@acm.org>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Currently, I am seeing the following when I `mount -t hugetlbfs /none
/dev/hugetlbfs`, and then simply do a `ls /dev/hugetlbfs`.  I think it's
related to the fact that hugetlbfs is properly not correctly setting
itself up in this state?:

  Unable to handle kernel paging request for data at address 0x00000031
  Faulting instruction address: 0xc000000000245710
  Oops: Kernel access of bad area, sig: 11 [#1]
  SMP NR_CPUS=2048 NUMA pSeries
  ....

In KVM guests on Power, in a guest not backed by hugepages, we see the
following:

  AnonHugePages:         0 kB
  HugePages_Total:       0
  HugePages_Free:        0
  HugePages_Rsvd:        0
  HugePages_Surp:        0
  Hugepagesize:         64 kB

HPAGE_SHIFT == 0 in this configuration, which indicates that hugepages
are not supported at boot-time, but this is only checked in
hugetlb_init().  Extract the check to a helper function, and use it in a
few relevant places.

This does make hugetlbfs not supported (not registered at all) in this
environment.  I believe this is fine, as there are no valid hugepages
and that won't change at runtime.

[akpm@linux-foundation.org: use pr_info(), per Mel]
[akpm@linux-foundation.org: fix build when HPAGE_SHIFT is undefined]
Signed-off-by: NNishanth Aravamudan <nacc@linux.vnet.ibm.com>
Reviewed-by: NAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Acked-by: NMel Gorman <mgorman@suse.de>
Cc: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

too many places open-code it
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>