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| author | Tzachi Perelstein <tzachi@marvell.com> | 2007-09-09 14:24:59 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2007-09-13 15:10:27 +0100 |
| commit | b9338a78fc21e980d33c58b31f3bb37cd48a68f6 (patch) | |
| tree | a70c8ce2b23ddc383f3908e71b1dfa1141363b88 | |
| parent | a53d6fb83efc75bbd7876459e6e1291c4925103d (diff) | |
| download | blackbird-op-linux-b9338a78fc21e980d33c58b31f3bb37cd48a68f6.tar.gz blackbird-op-linux-b9338a78fc21e980d33c58b31f3bb37cd48a68f6.zip | |
[ARM] 4567/1: Fix 'Oops - undefined instruction' when CONFIG_VFP=y on non VFP device
vfp_init() takes care of the condition when CONFIG_VFP=y but no real VFP
device exists. However, when this condition is true, a compiler might
misplace code lines in a way that will break this support. (To be more
specific - fmrx(FPSID) might be executed before vfp_testing_entry
assignment, which will end up with Oops - undefined instruction).
This patch adds a barrier() to guarantee the right execution ordering.
Signed-off-by: Assaf Hoffman
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| -rw-r--r-- | arch/arm/vfp/vfpmodule.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c index 04ddab2bd876..eea3f50743d5 100644 --- a/arch/arm/vfp/vfpmodule.c +++ b/arch/arm/vfp/vfpmodule.c @@ -323,6 +323,7 @@ static int __init vfp_init(void) * we just need to read the VFPSID register. */ vfp_vector = vfp_testing_entry; + barrier(); vfpsid = fmrx(FPSID); barrier(); vfp_vector = vfp_null_entry; |
