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authorDavid Howells <dhowells@redhat.com>2008-04-10 16:11:05 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-10 13:41:29 -0700
commitf17520e1f19172057328e50ffed01a42534921e9 (patch)
tree34d23d8bfff4511687b91c93d9bb09b4fa9d931f /include/asm-frv
parented9b949f55bc8a6bb6083ce0eddb53d06aee302a (diff)
FRV: Don't make smp_{r, w, }mb() interpolate MEMBAR when CONFIG_SMP=n [try #2]
Don't make smp_{r,w,}mb() interpolate a MEMBAR instruction when CONFIG_SMP=n as SMP memory barries on UP systems should interpolate a compiler barrier only. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-frv')
-rw-r--r--include/asm-frv/system.h21
1 files changed, 15 insertions, 6 deletions
diff --git a/include/asm-frv/system.h b/include/asm-frv/system.h
index 2c57f4734746..30a67a9da11a 100644
--- a/include/asm-frv/system.h
+++ b/include/asm-frv/system.h
@@ -179,14 +179,23 @@ do { \
#define mb() asm volatile ("membar" : : :"memory")
#define rmb() asm volatile ("membar" : : :"memory")
#define wmb() asm volatile ("membar" : : :"memory")
-#define set_mb(var, value) do { var = value; mb(); } while (0)
+#define read_barrier_depends() barrier()
-#define smp_mb() mb()
-#define smp_rmb() rmb()
-#define smp_wmb() wmb()
-
-#define read_barrier_depends() do {} while(0)
+#ifdef CONFIG_SMP
+#define smp_mb() mb()
+#define smp_rmb() rmb()
+#define smp_wmb() wmb()
#define smp_read_barrier_depends() read_barrier_depends()
+#define set_mb(var, value) \
+ do { xchg(&var, (value)); } while (0)
+#else
+#define smp_mb() barrier()
+#define smp_rmb() barrier()
+#define smp_wmb() barrier()
+#define smp_read_barrier_depends() do {} while(0)
+#define set_mb(var, value) \
+ do { var = (value); barrier(); } while (0)
+#endif
#define HARD_RESET_NOW() \
do { \