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>
diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
index ba3e2ff..c09a141 100644
--- a/arch/x86/include/asm/paravirt.h
+++ b/arch/x86/include/asm/paravirt.h
@@ -1402,6 +1402,7 @@
{
return PVOP_CALL1(int, pv_lock_ops.spin_is_contended, lock);
}
+#define __raw_spin_is_contended __raw_spin_is_contended
static __always_inline void __raw_spin_lock(struct raw_spinlock *lock)
{