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 23:54:16 +0100 |
| commit | 89c7e4b8bbb3d4fa52df5746a8ad38e610143651 (patch) | |
| tree | f6d3d835f5fca88fd4de01f166d782f16c2fe3c9 /arch/arm/mm | |
| parent | ARM: 7660/1: tlb: add branch predictor maintenance operations (diff) | |
| download | linux-89c7e4b8bbb3d4fa52df5746a8ad38e610143651.tar.xz linux-89c7e4b8bbb3d4fa52df5746a8ad38e610143651.zip | |
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/mm')
| -rw-r--r-- | arch/arm/mm/context.c | 4 | ||||
| -rw-r--r-- | arch/arm/mm/idmap.c | 1 |
2 files changed, 4 insertions, 1 deletions
diff --git a/arch/arm/mm/context.c b/arch/arm/mm/context.c index 44d4ee52f3e2..a5a4b2bc42ba 100644 --- a/arch/arm/mm/context.c +++ b/arch/arm/mm/context.c @@ -212,8 +212,10 @@ void check_and_switch_context(struct mm_struct *mm, struct task_struct *tsk) atomic64_set(&mm->context.id, asid); } - if (cpumask_test_and_clear_cpu(cpu, &tlb_flush_pending)) + if (cpumask_test_and_clear_cpu(cpu, &tlb_flush_pending)) { + local_flush_bp_all(); local_flush_tlb_all(); + } atomic64_set(&per_cpu(active_asids, cpu), asid); cpumask_set_cpu(cpu, mm_cpumask(mm)); diff --git a/arch/arm/mm/idmap.c b/arch/arm/mm/idmap.c index 2dffc010cc41..5ee505c937d1 100644 --- a/arch/arm/mm/idmap.c +++ b/arch/arm/mm/idmap.c @@ -141,6 +141,7 @@ void setup_mm_for_reboot(void) { /* Switch to the identity mapping. */ cpu_switch_mm(idmap_pgd, &init_mm); + local_flush_bp_all(); #ifdef CONFIG_CPU_HAS_ASID /* |