linux.git/arch, branch v3.18.64

ARM: 8632/1: ftrace: fix syscall name matching

2017-08-11T16:30:16+00:00

[ Upstream commit 270c8cf1cacc69cb8d99dea812f06067a45e4609 ]

ARM has a few system calls (most notably mmap) for which the names of
the functions which are referenced in the syscall table do not match the
names of the syscall tracepoints.  As a consequence of this, these
tracepoints are not made available.  Implement
arch_syscall_match_sym_name to fix this and allow tracing even these
system calls.

Signed-off-by: Rabin Vincent 
Signed-off-by: Russell King 
Signed-off-by: Sasha Levin 
Signed-off-by: Greg Kroah-Hartman

x86/boot: Add missing declaration of string functions

2017-08-11T16:30:15+00:00

[ Upstream commit fac69d0efad08fc15e4dbfc116830782acc0dc9a ]

Add the missing declarations of basic string functions to string.h to allow
a clean build.

Fixes: 5be865661516 ("String-handling functions for the new x86 setup code.")
Signed-off-by: Nicholas Mc Guire 
Link: http://lkml.kernel.org/r/1483781911-21399-1-git-send-email-hofrat@osadl.org
Signed-off-by: Thomas Gleixner 
Signed-off-by: Sasha Levin 
Signed-off-by: Greg Kroah-Hartman

KVM: async_pf: make rcu irq exit if not triggered from idle task

2017-08-11T16:30:13+00:00

commit 337c017ccdf2653d0040099433fc1a2b1beb5926 upstream.

 WARNING: CPU: 5 PID: 1242 at kernel/rcu/tree_plugin.h:323 rcu_note_context_switch+0x207/0x6b0
 CPU: 5 PID: 1242 Comm: unity-settings- Not tainted 4.13.0-rc2+ #1
 RIP: 0010:rcu_note_context_switch+0x207/0x6b0
 Call Trace:
  __schedule+0xda/0xba0
  ? kvm_async_pf_task_wait+0x1b2/0x270
  schedule+0x40/0x90
  kvm_async_pf_task_wait+0x1cc/0x270
  ? prepare_to_swait+0x22/0x70
  do_async_page_fault+0x77/0xb0
  ? do_async_page_fault+0x77/0xb0
  async_page_fault+0x28/0x30
 RIP: 0010:__d_lookup_rcu+0x90/0x1e0

I encounter this when trying to stress the async page fault in L1 guest w/
L2 guests running.

Commit 9b132fbe5419 (Add rcu user eqs exception hooks for async page
fault) adds rcu_irq_enter/exit() to kvm_async_pf_task_wait() to exit cpu
idle eqs when needed, to protect the code that needs use rcu.  However,
we need to call the pair even if the function calls schedule(), as seen
from the above backtrace.

This patch fixes it by informing the RCU subsystem exit/enter the irq
towards/away from idle for both n.halted and !n.halted.

Cc: Paolo Bonzini 
Cc: Radim Krčmář 
Cc: Paul E. McKenney 
Signed-off-by: Wanpeng Li 
Reviewed-by: Paolo Bonzini 
Signed-off-by: Radim Krčmář 
Signed-off-by: Greg Kroah-Hartman

tile: use global strscpy() rather than private copy

2017-08-11T16:30:13+00:00

commit 30059d494a72603d066baf55c748803df968aa08 upstream.

Now that strscpy() is a standard API, remove the local copy.

Signed-off-by: Chris Metcalf 
Signed-off-by: Greg Kroah-Hartman

arch/powerpc: provide zero_bytemask() for big-endian

2017-08-11T16:30:13+00:00

commit 7a5692e6e533fd379081ab06fb58f3f5ee4d80bc upstream.

For some reason, only the little-endian flavor of
powerpc provided the zero_bytemask() implementation.

Reported-by: Michal Sojka 
Acked-by: Michael Ellerman 
Signed-off-by: Chris Metcalf 
Signed-off-by: Greg Kroah-Hartman

Make asm/word-at-a-time.h available on all architectures

2017-08-11T16:30:13+00:00

commit a6e2f029ae34f41adb6ae3812c32c5d326e1abd2 upstream.

Added the x86 implementation of word-at-a-time to the
generic version, which previously only supported big-endian.

Omitted the x86-specific load_unaligned_zeropad(), which in
any case is also not present for the existing BE-only
implementation of a word-at-a-time, and is only used under
CONFIG_DCACHE_WORD_ACCESS.

Added as a "generic-y" to the Kbuilds of all architectures
that didn't previously have it.

Signed-off-by: Chris Metcalf 
Signed-off-by: Greg Kroah-Hartman

word-at-a-time.h: support zero_bytemask() on alpha and tile

2017-08-11T16:30:13+00:00

commit c753bf34c94e5ac901e625e52f47320eeec4de2d upstream.

Both alpha and tile needed implementations of zero_bytemask.

The alpha version is untested.

Signed-off-by: Chris Metcalf 
Signed-off-by: Greg Kroah-Hartman

tile: add and enable support functions

2017-08-11T16:30:12+00:00

commit 5bf6c07a1843813d0065feaaecba622d49148d7e upstream.

This change enables the generic strncpy_from_user() and strnlen_user()
using word-at-a-time.h.  The tile implementation is trivial since
both tilepro and tilegx have SIMD operations that do byte-wise
comparisons against immediate zero for each byte, and return an
0x01 byte in each position where there is a 0x00 byte.

Signed-off-by: Chris Metcalf 
Signed-off-by: Greg Kroah-Hartman

ARM: dts: n900: Mark eMMC slot with no-sdio and no-sd flags

2017-08-11T16:30:12+00:00

[ Upstream commit 4cf48f1d7520a4d325af58eded4d8090e1b40be7 ]

Trying to initialize eMMC slot as SDIO or SD cause failure in n900 port of
qemu. eMMC itself is not detected and is not working.

Real Nokia N900 harware does not have this problem. As eMMC is really not
SDIO or SD based such change is harmless and will fix support for qemu.

Signed-off-by: Pali Rohár 
Acked-by: Pavel Machek 
Signed-off-by: Tony Lindgren 
Signed-off-by: Sasha Levin 
Signed-off-by: Greg Kroah-Hartman

x86/mce/AMD: Make the init code more robust

2017-08-11T16:30:11+00:00

[ Upstream commit 0dad3a3014a0b9e72521ff44f17e0054f43dcdea ]

If mce_device_init() fails then the mce device pointer is NULL and the
AMD mce code happily dereferences it.

Add a sanity check.

Reported-by: Markus Trippelsdorf 
Reported-by: Boris Ostrovsky 
Signed-off-by: Thomas Gleixner 
Signed-off-by: Linus Torvalds 
Signed-off-by: Sasha Levin 
Signed-off-by: Greg Kroah-Hartman