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x86: spinlocks: define dummy __raw_spin_is_contended

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Architectures other than mips and x86 are not using ticket spinlocks.
Therefore, the contention on the lock is meaningless, since there is
nobody known to be waiting on it (arguably /fairly/ unfair locks).

Dummy it out to return 0 on other architectures.

Signed-off-by: Kyle McMartin <kyle@redhat.com>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kyle McMartin
2009-02-08 17:39:58 -05:00
committed by Linus Torvalds
parent d5b562330e
commit a5ef7ca0e2
4 changed files with 8 additions and 0 deletions
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arch/x86/include/asm/spinlock.h
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@ -245,6 +245,7 @@ static inline int __raw_spin_is_contended(raw_spinlock_t *lock)
{
return __ticket_spin_is_contended(lock);
}
#define __raw_spin_is_contended __raw_spin_is_contended
static __always_inline void __raw_spin_lock(raw_spinlock_t *lock)
{