linux-toradex.git/arch/mips/kernel/signal.c, branch v3.4.67

MIPS: Use set_current_blocked() and block_sigmask()

2012-04-26T23:12:47+00:00

As described in e6fa16ab ("signal: sigprocmask() should do
retarget_shared_pending()") the modification of current->blocked is
incorrect as we need to check whether the signal we're about to block
is pending in the shared queue.

Also, use the new helper function introduced in commit 5e6292c0f28f
("signal: add block_sigmask() for adding sigmask to current->blocked")
which centralises the code for updating current->blocked after
successfully delivering a signal and reduces the amount of duplicate
code across architectures. In the past some architectures got this
code wrong, so using this helper function should stop that from
happening again.

Cc: Oleg Nesterov 
Cc: Andrew Morton 
Cc: linux-kernel@vger.kernel.org
Cc: Al Viro 
Cc: David Daney 
Cc: linux-mips@linux-mips.org
Signed-off-by: Matt Fleming 
Patchwork: https://patchwork.linux-mips.org/patch/3363/
Signed-off-by: Ralf Baechle

Disintegrate asm/system.h for MIPS

2012-03-28T17:30:02+00:00

Disintegrate asm/system.h for MIPS.

Signed-off-by: David Howells 
Acked-by: Ralf Baechle 
cc: linux-mips@linux-mips.org

MIPS: Handle __put_user() sleeping.

2011-09-21T15:52:38+00:00

do_signal() does __put_user() which can fault, resulting in a might_sleep()
warning in down_read(&mm->mmap_sem) and a "scheduling while atomic" warning
when mmap_sem is contented. On Swarm this also results in:

WARNING: at kernel/smp.c:459 smp_call_function_many+0x148/0x398()
Modules linked in:
Call Trace:

[] dump_stack+0x1c/0x50
[] warn_slowpath_common+0x8c/0xc8
[] warn_slowpath_null+0x2c/0x40
[] smp_call_function_many+0x148/0x398
[] smp_call_function+0x58/0xa8
[] r4k_flush_data_cache_page+0x54/0xd8
[] handle_pte_fault+0xa9c/0xad0
[] handle_mm_fault+0x158/0x200
[] do_page_fault+0x218/0x3b0
[] ret_from_exception+0x0/0x10
[] copy_siginfo_to_user32+0x50/0x298
[] setup_rt_frame_32+0x90/0x250
[] do_notify_resume+0x154/0x358
[] work_notifysig+0xc/0x14

Fixed by enabling interrupts in do_notify_resume before delivering signals.

[ralf@linux-mips.org: Reported and original fix by tglx but I wanted to
minimize the amount of code being run with interrupts disabled so I moved
the local_irq_disable() call right into do_notify_resume.  Which is saner
than doing it in entry.S.]

Reported-by: Thomas Gleixner 
Signed-off-by: Ralf Baechle

MIPS: Fix GCC-4.6 'set but not used' warning in signal*.c

2011-03-14T20:07:25+00:00

GCC-4.6 can find more unused code than previous versions could.

In the case of protected_restore_fp_context{,32}, the variable tmp is
really used.  Its use is tricky in that we really care about the side
effects of the __put_user() calls.  So we must mark tmp with
__maybe_unused to quiet the warning.

Signed-off-by: David Daney 
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2035/
Signed-off-by: Ralf Baechle

MIPS: do_sigaltstack() expects userland pointers

2010-10-18T15:59:03+00:00

o32 compat does the right thing, native and n32 compat do not...

Signed-off-by: Al Viro 
Cc: linux-kernel@vger.kernel.org
Cc: linux-arch@vger.kernel.org
Cc: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/1700/
Signed-off-by: Ralf Baechle

MIPS: Sanitize restart logics

2010-10-18T15:59:02+00:00

Put the original syscall number into ->regs[0] when we leave syscall
with error.  Use it in restart logics.  Everything else will have
it 0 since we pass through SAVE_SOME on all the ways in.  Note that
in places like bad_stack and inllegal_syscall we leave it 0 - it's not
restartable.

Signed-off-by: Al Viro 
Cc: linux-kernel@vger.kernel.org
Cc: linux-arch@vger.kernel.org
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/1698/
Signed-off-by: Ralf Baechle

MIPS: Don't block signals if we'd failed to setup a sigframe

2010-10-18T15:59:02+00:00

Signed-off-by: Al Viro 
Cc: linux-kernel@vger.kernel.org
Cc: linux-arch@vger.kernel.org
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/1696/
Signed-off-by: Ralf Baechle

MIPS: Move signal trampolines off of the stack.

2010-04-12T16:26:15+00:00

This is a follow on to the vdso patch.

Since all processes now have signal trampolines permanently mapped, we
can use those instead of putting the trampoline on the stack and
invalidating the corresponding icache across all CPUs.  We also get rid
of a bunch of ICACHE_REFILLS_WORKAROUND_WAR code.

[Ralf: GDB 7.1 which has the necessary modifications to allow backtracing
over signal frames will supposedly be released tomorrow.  The old signal
frame format obsoleted by this patch exists in two variations, for sane
processors and for those requiring ICACHE_REFILLS_WORKAROUND_WAR.  So
there was never a GDB which did support backtracing over signal frames
on all MIPS systems.  This convinved me this series should be applied and
pushed upstream as soon as possible.]

Signed-off-by: David Daney 
To: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/974/
Signed-off-by: Ralf Baechle

MIPS: Cleanup signal code initialization

2009-12-17T01:57:32+00:00

Signed-off-by: Ralf Baechle 
Cc: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/709/

KEYS: Add missing linux/tracehook.h #inclusions

2009-09-09T08:30:02+00:00

Add #inclusions of linux/tracehook.h to those arch files that had the tracehook
call for TIF_NOTIFY_RESUME added when support for that flag was added to that
arch.

Signed-off-by: David Howells 
Signed-off-by: James Morris