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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/mm/idmap.c
parent862c588f062fe9339a180cf6429e4df1855c376a (diff)
downloadlinux-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/mm/idmap.c')
-rw-r--r--arch/arm/mm/idmap.c1
1 files changed, 1 insertions, 0 deletions
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
/*