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authorWill Deacon <will.deacon@arm.com>2017-10-03 21:25:27 +0300
committerIngo Molnar <mingo@kernel.org>2017-10-10 12:50:18 +0300
commita8a217c22116eff6c120d753c9934089fb229af0 (patch)
treed56f1283ba7153f9ead9fb92c1a1794143c6e4a3 /include/linux/rwlock.h
parent26c4eb192c6224e5297496cead36404b62fb071b (diff)
downloadlinux-a8a217c22116eff6c120d753c9934089fb229af0.tar.xz
locking/core: Remove {read,spin,write}_can_lock()
Outside of the locking code itself, {read,spin,write}_can_lock() have no users in tree. Apparmor (the last remaining user of write_can_lock()) got moved over to lockdep by the previous patch. This patch removes the use of {read,spin,write}_can_lock() from the BUILD_LOCK_OPS macro, deferring to the trylock operation for testing the lock status, and subsequently removes the unused macros altogether. They aren't guaranteed to work in a concurrent environment and can give incorrect results in the case of qrwlock. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: paulmck@linux.vnet.ibm.com Link: http://lkml.kernel.org/r/1507055129-12300-2-git-send-email-will.deacon@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/rwlock.h')
-rw-r--r--include/linux/rwlock.h3
1 files changed, 0 insertions, 3 deletions
diff --git a/include/linux/rwlock.h b/include/linux/rwlock.h
index bc2994ed66e1..766c5ca5cbd1 100644
--- a/include/linux/rwlock.h
+++ b/include/linux/rwlock.h
@@ -50,9 +50,6 @@ do { \
# define do_raw_write_unlock(rwlock) do {arch_write_unlock(&(rwlock)->raw_lock); __release(lock); } while (0)
#endif
-#define read_can_lock(rwlock) arch_read_can_lock(&(rwlock)->raw_lock)
-#define write_can_lock(rwlock) arch_write_can_lock(&(rwlock)->raw_lock)
-
/*
* Define the various rw_lock methods. Note we define these
* regardless of whether CONFIG_SMP or CONFIG_PREEMPT are set. The various