Will Deacon 03e3c2b7ed locking/barriers, arch/arm64: Implement LDXR+WFE based smp_cond_load_acquire() ... smp_cond_load_acquire() is used to spin on a variable until some expression involving that variable becomes true. On arm64, we can build this using the LDXR and WFE instructions, since clearing of the exclusive monitor as a result of the variable being changed by another CPU generates an event, which will wake us up out of WFE. This patch implements smp_cond_load_acquire() using LDXR and WFE, which themselves are contained in an internal __cmpwait() function. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: catalin.marinas@arm.com Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1467049434-30451-1-git-send-email-will.deacon@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>		2016-07-07 09:10:53 +02:00
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asm	locking/barriers, arch/arm64: Implement LDXR+WFE based smp_cond_load_acquire()	2016-07-07 09:10:53 +02:00
uapi/asm	asm-generic: Drop renameat syscall from default list	2016-05-05 00:42:21 +02:00