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authorWill Deacon <will.deacon@arm.com>2013-02-28 17:48:40 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2013-03-03 22:54:16 +0000
commit89c7e4b8bbb3d4fa52df5746a8ad38e610143651 (patch)
treef6d3d835f5fca88fd4de01f166d782f16c2fe3c9 /arch/arm/kernel/smp.c
parent862c588f062fe9339a180cf6429e4df1855c376a (diff)
downloadvexpress-lsk-89c7e4b8bbb3d4fa52df5746a8ad38e610143651.tar.gz
ARM: 7661/1: mm: perform explicit branch predictor maintenance when required
The ARM ARM requires branch predictor maintenance if, for a given ASID, the instructions at a specific virtual address appear to change. From the kernel's point of view, that means: - Changing the kernel's view of memory (e.g. switching to the identity map) - ASID rollover (since ASIDs will be re-allocated to new tasks) This patch adds explicit branch predictor maintenance when either of the two conditions above are met. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/kernel/smp.c')
-rw-r--r--arch/arm/kernel/smp.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 1bdfd87c8e4..31644f1978d 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -285,6 +285,7 @@ asmlinkage void __cpuinit secondary_start_kernel(void)
* switch away from it before attempting any exclusive accesses.
*/
cpu_switch_mm(mm->pgd, mm);
+ local_flush_bp_all();
enter_lazy_tlb(mm, current);
local_flush_tlb_all();