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| author |   Kyle McMartin <kyle@redhat.com> | 2009-02-08 17:39:58 -0500 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2009-02-09 08:15:39 -0800 |
| commit | a5ef7ca0e2636bad0ccd07b996d775348ae2b65e (patch) | |
| tree | fcc1ef7e4bd95ce58d5bbb74ad129bdc248252ca /include/linux/spinlock.h | |
| parent | mm: fix error case in mlock downgrade reversion (diff) | |
| download | linux-dev-a5ef7ca0e2636bad0ccd07b996d775348ae2b65e.tar.xz linux-dev-a5ef7ca0e2636bad0ccd07b996d775348ae2b65e.zip | |
x86: spinlocks: define dummy __raw_spin_is_contended
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>
Diffstat (limited to 'include/linux/spinlock.h')
| -rw-r--r-- | include/linux/spinlock.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h index e0c0fccced46..a0c66a2e00ad 100644 --- a/include/linux/spinlock.h +++ b/include/linux/spinlock.h @@ -124,7 +124,12 @@ do { \ #ifdef CONFIG_GENERIC_LOCKBREAK #define spin_is_contended(lock) ((lock)->break_lock) #else + +#ifdef __raw_spin_is_contended #define spin_is_contended(lock) __raw_spin_is_contended(&(lock)->raw_lock) +#else +#define spin_is_contended(lock) (((void)(lock), 0)) +#endif /*__raw_spin_is_contended*/ #endif /** |