diff options
author | Will Deacon <will.deacon@arm.com> | 2013-02-28 17:48:40 +0100 |
---|---|---|
committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2013-03-03 22:54:16 +0000 |
commit | 89c7e4b8bbb3d4fa52df5746a8ad38e610143651 (patch) | |
tree | f6d3d835f5fca88fd4de01f166d782f16c2fe3c9 /arch/arm/kernel/smp.c | |
parent | 862c588f062fe9339a180cf6429e4df1855c376a (diff) | |
download | linux-89c7e4b8bbb3d4fa52df5746a8ad38e610143651.tar.bz2 |
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.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index 1bdfd87c8e41..31644f1978d5 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(); |