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  1. 21 1月, 2016 15 次提交
  3. 20 1月, 2016 2 次提交
  5. 19 1月, 2016 7 次提交
    • C
      numa: remove stale node_has_online_mem() define · 00d27c63
      由 Chris Metcalf 提交于 
      This isn't used anywhere, so delete it.

Looks like the last usage (in x86-specific code) was removed by Tejun
in 2011 in commit bd6709a9 ("x86, NUMA: Make 32bit use common NUMA
init path").
Signed-off-by: NChris Metcalf <cmetcalf@ezchip.com>
      00d27c63
    • C
      arch/tile: move user_exit() to early kernel entry sequence · 1bb50cad
      由 Chris Metcalf 提交于 
      This ensures that we always notify context tracking that we
have exited from user space no matter how we enter the kernel.
It is similar to how arm64 handles context tracking, for example.

This allows the removal of all the exception_enter() calls that
were added in commit 49e4e156 ("tile: support CONTEXT_TRACKING and
thus NOHZ_FULL").
Signed-off-by: NChris Metcalf <cmetcalf@ezchip.com>
      1bb50cad
    • C
      tile: fix bug in setting PT_FLAGS_DISABLE_IRQ on kernel entry · 9ce815ed
      由 Chris Metcalf 提交于 
      This flag value is saved in ptregs and used to decide whether
to disable irqs when returning from the kernel.  Commit 1168df528fe4
("tile: don't assume user privilege is zero") performed a bad
merge from some KVM-enabled code that had not yet been upstreamed.

The only issue with the old code is that we will read the interrupt
mask in more conditions than we need to (e.g., coming from user
space when user space has the Interrupt Critical Section bit set, or
coming from a guest kernel), which is a slow multi-cycle operation.
This change saves those few cycles in the common case.
Signed-off-by: NChris Metcalf <cmetcalf@ezchip.com>
      9ce815ed
    • C
      tile: fix tilepro casts for readl, writel, etc · acfb699e
      由 Chris Metcalf 提交于 
      Missing parentheses could cause an argument of the form
"integer + pointer" to get cast to "(long)integer + pointer"
and remain a pointer type, causing compiler warnings.
Signed-off-by: NChris Metcalf <cmetcalf@ezchip.com>
      acfb699e
    • C
      tile: fix a -Wframe-larger-than warning · f3a26163
      由 Chris Metcalf 提交于 
      The warning occurs in setup.c, where it is known that it can't be
a problem, but it's still a good idea to silence the warning.
The onstack array is converted from an s32 to a u8, which still
is plenty of range for the values being managed there.
Signed-off-by: NChris Metcalf <cmetcalf@ezchip.com>
      f3a26163
    • C
      tile: include the syscall number in the backtrace · 5ac65abd
      由 Chris Metcalf 提交于 
      This information is easily available in the backtrace data and can
be helpful when trying to figure out the backtrace, particularly
if we're early in kernel entry or late in kernel exit.
Signed-off-by: NChris Metcalf <cmetcalf@ezchip.com>
      5ac65abd
    • C
      arch/tile: adopt prepare_exit_to_usermode() model from x86 · 583b24a2
      由 Chris Metcalf 提交于 
      This change is a prerequisite change for TASK_ISOLATION but also
stands on its own for readability and maintainability.  The existing
tile do_work_pending() was called in a loop from assembly on
the slow path; this change moves the loop into C code as well.
For the x86 version see commit c5c46f59 ("x86/entry: Add new,
comprehensible entry and exit handlers written in C").

This change exposes a pre-existing bug on the older tilepro platform;
the singlestep processing is done last, but on tilepro (unlike tilegx)
we enable interrupts while doing that processing, so we could in
theory miss a signal or other asynchronous event.  A future change
could fix this by breaking the singlestep work into a "prepare"
step done in the main loop, and a "trigger" step done after exiting
the loop.  Since this change is intended as purely a restructuring
change, we call out the bug explicitly now, but don't yet fix it.
Signed-off-by: NChris Metcalf <cmetcalf@ezchip.com>
      583b24a2
  7. 18 1月, 2016 2 次提交
  9. 17 1月, 2016 2 次提交
    • W
      Kconfig: remove HAVE_LATENCYTOP_SUPPORT · da48d094
      由 Will Deacon 提交于 
      As illustrated by commit a3afe70b ("[S390] latencytop s390
support."), HAVE_LATENCYTOP_SUPPORT is defined by an architecture to
advertise an implementation of save_stack_trace_tsk.

However, as of 9212ddb5 ("stacktrace: provide save_stack_trace_tsk()
weak alias") a dummy implementation is provided if STACKTRACE=y.  Given
that LATENCYTOP already depends on STACKTRACE_SUPPORT and selects
STACKTRACE, we can remove HAVE_LATENCYTOP_SUPPORT altogether.
Signed-off-by: NWill Deacon <will.deacon@arm.com>
Acked-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Helge Deller <deller@gmx.de>
Acked-by: NMichael Ellerman <mpe@ellerman.id.au>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Cc: Ingo Molnar <mingo@redhat.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      da48d094
    • H
      parisc: Protect huge page pte changes with spinlocks · b0e55131
      由 Helge Deller 提交于 
      PA-RISC doesn't have atomic instructions to modify page table entries, so it
takes spinlock in the TLB handler and modifies the page table entry
non-atomically. If you modify the page table entry without the spinlock, you
may race with TLB handler on another CPU and your modification may be lost.
Protect against that with usage of purge_tlb_start() and purge_tlb_end() which
handles the TLB spinlock.
Signed-off-by: NHelge Deller <deller@gmx.de>
Cc: stable@vger.kernel.org # v4.4
      b0e55131
  11. 16 1月, 2016 12 次提交