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locking/qspinlock/x86: Only emit the test-and-set fallback when building guest support 

Only emit the test-and-set fallback for Hypervisors lacking
PARAVIRT_SPINLOCKS support when building for guests.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Cc: stable@vger.kernel.org # 4.2
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra 2015-09-05 16:55:05 +02:00 committed by Ingo Molnar
parent 43b3f02899
commit a6b277857f
1 changed files with 2 additions and 1 deletions
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3
arch/x86/include/asm/qspinlock.h
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@ -39,8 +39,8 @@ static inline void queued_spin_unlock(struct qspinlock *lock)
}
#endif
#ifdef CONFIG_PARAVIRT
#define virt_spin_lock virt_spin_lock
static inline bool virt_spin_lock(struct qspinlock *lock)
{
if (!static_cpu_has(X86_FEATURE_HYPERVISOR))
@ -59,6 +59,7 @@ static inline bool virt_spin_lock(struct qspinlock *lock)
return true;
}
#endif /* CONFIG_PARAVIRT */
#include <asm-generic/qspinlock.h>