path: root/arch/alpha/include/asm/rwsem.h
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authorMichal Hocko <>2016-04-07 17:12:26 +0200
committerIngo Molnar <>2016-04-13 10:42:20 +0200
commitd47996082f52baa0ca8b48d26b3cbef5ede70a73 (patch)
tree4cf040a0e47c09d28c974ab775613f461650e1f8 /arch/alpha/include/asm/rwsem.h
parent938072e32ce13e5537ef001cdabcb8a6932b09a0 (diff)
locking/rwsem: Introduce basis for down_write_killable()
Introduce a generic implementation necessary for down_write_killable(). This is a trivial extension of the already existing down_write() call which can be interrupted by SIGKILL. This patch doesn't provide down_write_killable() yet because arches have to provide the necessary pieces before. rwsem_down_write_failed() which is a generic slow path for the write lock is extended to take a task state and renamed to __rwsem_down_write_failed_common(). The return value is either a valid semaphore pointer or ERR_PTR(-EINTR). rwsem_down_write_failed_killable() is exported as a new way to wait for the lock and be killable. For rwsem-spinlock implementation the current __down_write() it updated in a similar way as __rwsem_down_write_failed_common() except it doesn't need new exports just visible __down_write_killable(). Architectures which are not using the generic rwsem implementation are supposed to provide their __down_write_killable() implementation and use rwsem_down_write_failed_killable() for the slow path. Signed-off-by: Michal Hocko <> Cc: Andrew Morton <> Cc: Chris Zankel <> Cc: David S. Miller <> Cc: Linus Torvalds <> Cc: Max Filippov <> Cc: Paul E. McKenney <> Cc: Peter Zijlstra <> Cc: Signed-off-by: Davidlohr Bueso <> Cc: Signed-off-by: Jason Low <> Cc: Thomas Gleixner <> Cc: Tony Luck <> Cc: Cc: Cc: Cc: Cc: Cc: Cc: Link: Signed-off-by: Ingo Molnar <>
Diffstat (limited to 'arch/alpha/include/asm/rwsem.h')
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