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authorMichal Hocko <mhocko@suse.com>2016-04-07 18:12:30 +0300
committerIngo Molnar <mingo@kernel.org>2016-04-13 11:42:22 +0300
commit664b4e24c6145830885e854195376351b0eb3eee (patch)
treef82c5b229e33eb1c848085bc75d3fca4e885791c /arch/x86/lib
parent4edab14ec66fae5b3c7c4969295facf70365f39d (diff)
downloadlinux-664b4e24c6145830885e854195376351b0eb3eee.tar.xz
locking/rwsem, x86: Provide __down_write_killable()
which uses the same fast path as __down_write() except it falls back to call_rwsem_down_write_failed_killable() slow path and return -EINTR if killed. To prevent from code duplication extract the skeleton of __down_write() into a helper macro which just takes the semaphore and the slow path function to be called. Signed-off-by: Michal Hocko <mhocko@suse.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Chris Zankel <chris@zankel.net> Cc: David S. Miller <davem@davemloft.net> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Signed-off-by: Davidlohr Bueso <dbueso@suse.de> Cc: Signed-off-by: Jason Low <jason.low2@hp.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tony Luck <tony.luck@intel.com> Cc: linux-alpha@vger.kernel.org Cc: linux-arch@vger.kernel.org Cc: linux-ia64@vger.kernel.org Cc: linux-s390@vger.kernel.org Cc: linux-sh@vger.kernel.org Cc: linux-xtensa@linux-xtensa.org Cc: sparclinux@vger.kernel.org Link: http://lkml.kernel.org/r/1460041951-22347-11-git-send-email-mhocko@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/lib')
-rw-r--r--arch/x86/lib/rwsem.S8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/lib/rwsem.S b/arch/x86/lib/rwsem.S
index be110efa0096..4534a7e912f3 100644
--- a/arch/x86/lib/rwsem.S
+++ b/arch/x86/lib/rwsem.S
@@ -106,6 +106,14 @@ ENTRY(call_rwsem_down_write_failed)
ret
ENDPROC(call_rwsem_down_write_failed)
+ENTRY(call_rwsem_down_write_failed_killable)
+ save_common_regs
+ movq %rax,%rdi
+ call rwsem_down_write_failed_killable
+ restore_common_regs
+ ret
+ENDPROC(call_rwsem_down_write_failed_killable)
+
ENTRY(call_rwsem_wake)
FRAME_BEGIN
/* do nothing if still outstanding active readers */