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authorPeter Zijlstra <peterz@infradead.org>2016-04-04 10:57:12 +0200
committerIngo Molnar <mingo@kernel.org>2016-06-14 11:54:27 +0200
commit1f03e8d2919270bd6ef64f39a45ce8df8a9f012a (patch)
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parent245050c287a9176cee9f98109df101909c1eeef4 (diff)
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locking/barriers: Replace smp_cond_acquire() with smp_cond_load_acquire()
This new form allows using hardware assisted waiting. Some hardware (ARM64 and x86) allow monitoring an address for changes, so by providing a pointer we can use this to replace the cpu_relax() with hardware optimized methods in the future. Requested-by: Will Deacon <will.deacon@arm.com> Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'ipc/sem.c')
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