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authorRussell King <rmk+kernel@arm.linux.org.uk>2011-06-09 10:10:27 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2011-06-09 10:13:04 +0100
commit07989b7ad63af424886ff922fd3bcca9e00ffa78 (patch)
tree5c3107ae9a50906de180addf6a111dab60e2427d /arch/arm/mm/proc-v7.S
parent17ee083b7897ab27b4949c42de805889ebd2b4c5 (diff)
Revert "ARM: 6943/1: mm: use TTBR1 instead of reserved context ID"
This reverts commit 52af9c6cd863fe37d1103035ec7ee22ac1296458. Will Deacon reports that: In 52af9c6c ("ARM: 6943/1: mm: use TTBR1 instead of reserved context ID") I updated the ASID rollover code to use only the kernel page tables whilst updating the ASID. Unfortunately, the code to restore the user page tables was part of a later patch which isn't yet in mainline, so this leaves the code quite broken. We're also in the process of eliminating __ARCH_WANT_INTERRUPTS_ON_CTXSW from ARM, so lets revert these until we can properly sort out what we're doing with the ARM context switching. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mm/proc-v7.S')
-rw-r--r--arch/arm/mm/proc-v7.S10
1 files changed, 6 insertions, 4 deletions
diff --git a/arch/arm/mm/proc-v7.S b/arch/arm/mm/proc-v7.S
index b3b566ec83d..3c3867850a3 100644
--- a/arch/arm/mm/proc-v7.S
+++ b/arch/arm/mm/proc-v7.S
@@ -108,16 +108,18 @@ ENTRY(cpu_v7_switch_mm)
#ifdef CONFIG_ARM_ERRATA_430973
mcr p15, 0, r2, c7, c5, 6 @ flush BTAC/BTB
#endif
- mrc p15, 0, r2, c2, c0, 1 @ load TTB 1
- mcr p15, 0, r2, c2, c0, 0 @ into TTB 0
+#ifdef CONFIG_ARM_ERRATA_754322
+ dsb
+#endif
+ mcr p15, 0, r2, c13, c0, 1 @ set reserved context ID
+ isb
+1: mcr p15, 0, r0, c2, c0, 0 @ set TTB 0
isb
#ifdef CONFIG_ARM_ERRATA_754322
dsb
#endif
mcr p15, 0, r1, c13, c0, 1 @ set context ID
isb
- mcr p15, 0, r0, c2, c0, 0 @ set TTB 0
- isb
#endif
mov pc, lr
ENDPROC(cpu_v7_switch_mm)