x86, tsc, locking/static_keys: Employ static_branch_likely()

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Because of the static_key restrictions we had to take an unconditional
jump for the most likely case, causing $I bloat.

Rewrite to use the new primitives.

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: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

...

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Peter Zijlstra 2015-07-24 16:34:32 +02:00 • committed by Ingo Molnar

parent 1987c947d9

commit 3bbfafb77a

1 changed files with 10 additions and 12 deletions

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arch/x86/kernel/tsc.c

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