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authorEric Dumazet <dada1@cosmosbay.com>2007-02-13 15:26:21 +0300
committerAndi Kleen <andi@basil.nowhere.org>2007-02-13 15:26:21 +0300
commit5809f9d442e9dbb23859e2c37d8c47043f6b5cc9 (patch)
tree24c634f6de962734a1a6a8b94504d9555a35fcea /kernel/timer.c
parent26054ed02bb20f5b2e02d92cb6f0be0e2b0196d5 (diff)
downloadlinux-5809f9d442e9dbb23859e2c37d8c47043f6b5cc9.tar.xz
[PATCH] x86-64: get rid of ARCH_HAVE_XTIME_LOCK
ARCH_HAVE_XTIME_LOCK is used by x86_64 arch . This arch needs to place a read only copy of xtime_lock into vsyscall page. This read only copy is named __xtime_lock, and xtime_lock is defined in arch/x86_64/kernel/vmlinux.lds.S as an alias. So the declaration of xtime_lock in kernel/timer.c was guarded by ARCH_HAVE_XTIME_LOCK define, defined to true on x86_64. We can get same result with _attribute__((weak)) in the declaration. linker should do the job. Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: Andi Kleen <ak@suse.de> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org>
Diffstat (limited to 'kernel/timer.c')
-rw-r--r--kernel/timer.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/kernel/timer.c b/kernel/timer.c
index 8533c3796082..4902181e10e6 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -1162,11 +1162,9 @@ static inline void calc_load(unsigned long ticks)
* This read-write spinlock protects us from races in SMP while
* playing with xtime and avenrun.
*/
-#ifndef ARCH_HAVE_XTIME_LOCK
-__cacheline_aligned_in_smp DEFINE_SEQLOCK(xtime_lock);
+__attribute__((weak)) __cacheline_aligned_in_smp DEFINE_SEQLOCK(xtime_lock);
EXPORT_SYMBOL(xtime_lock);
-#endif
/*
* This function runs timers and the timer-tq in bottom half context.