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[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>
This commit is contained in:
Tzachi Perelstein 2007-09-09 14:24:59 +01:00 committed by Russell King
parent a53d6fb83e
commit b9338a78fc
1 changed files with 1 additions and 0 deletions
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1
arch/arm/vfp/vfpmodule.c
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@ -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;