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authorPekka Enberg <penberg@kernel.org>2011-03-11 18:10:45 +0200
committerPekka Enberg <penberg@kernel.org>2011-03-11 18:10:45 +0200
commitc9149556756d56c68451a4a8735c37e7062fd3d7 (patch)
treea2dae56b22adaa9a23c8f92f30c3b3ad3b610850 /arch/sh/lib/delay.c
parentd71f606f687ef9d0cdddfd3619ca7cb9a0b3fb63 (diff)
parent5bfe53a77e8a3ffce4a10003c75f464a138e272d (diff)
downloadop-kernel-dev-c9149556756d56c68451a4a8735c37e7062fd3d7.zip
op-kernel-dev-c9149556756d56c68451a4a8735c37e7062fd3d7.tar.gz
Merge branch 'slab/rcu' into slab/next
Conflicts: mm/slub.c
Diffstat (limited to 'arch/sh/lib/delay.c')
-rw-r--r--arch/sh/lib/delay.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/sh/lib/delay.c b/arch/sh/lib/delay.c
index faa8f86..0901b2f 100644
--- a/arch/sh/lib/delay.c
+++ b/arch/sh/lib/delay.c
@@ -10,6 +10,16 @@
void __delay(unsigned long loops)
{
__asm__ __volatile__(
+ /*
+ * ST40-300 appears to have an issue with this code,
+ * normally taking two cycles each loop, as with all
+ * other SH variants. If however the branch and the
+ * delay slot straddle an 8 byte boundary, this increases
+ * to 3 cycles.
+ * This align directive ensures this doesn't occur.
+ */
+ ".balign 8\n\t"
+
"tst %0, %0\n\t"
"1:\t"
"bf/s 1b\n\t"
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