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-rw-r--r--arch/arm/kernel/entry-armv.S11
-rw-r--r--arch/arm/kernel/iwmmxt.S2
-rw-r--r--arch/arm/mach-ep93xx/crunch-bits.S2
-rw-r--r--arch/arm/vfp/entry.S3
4 files changed, 10 insertions, 8 deletions
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index 1879e8dd2acc..5fc897cf409b 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -413,6 +413,11 @@ __und_usr:
@
adr r9, BSYM(ret_from_exception)
+ @ IRQs must be enabled before attempting to read the instruction from
+ @ user space since that could cause a page/translation fault if the
+ @ page table was modified by another CPU.
+ enable_irq
+
tst r3, #PSR_T_BIT @ Thumb mode?
bne __und_usr_thumb
sub r4, r2, #4 @ ARM instr at LR - 4
@@ -517,7 +522,7 @@ ENDPROC(__und_usr)
* r9 = normal "successful" return address
* r10 = this threads thread_info structure
* lr = unrecognised instruction return address
- * IRQs disabled, FIQs enabled.
+ * IRQs enabled, FIQs enabled.
*/
@
@ Fall-through from Thumb-2 __und_usr
@@ -624,7 +629,6 @@ call_fpe:
#endif
do_fpe:
- enable_irq
ldr r4, .LCfp
add r10, r10, #TI_FPSTATE @ r10 = workspace
ldr pc, [r4] @ Call FP module USR entry point
@@ -652,8 +656,7 @@ __und_usr_fault_32:
b 1f
__und_usr_fault_16:
mov r1, #2
-1: enable_irq
- mov r0, sp
+1: mov r0, sp
adr lr, BSYM(ret_from_exception)
b __und_fault
ENDPROC(__und_usr_fault_32)
diff --git a/arch/arm/kernel/iwmmxt.S b/arch/arm/kernel/iwmmxt.S
index fcb33a70a35f..4bb029ea8917 100644
--- a/arch/arm/kernel/iwmmxt.S
+++ b/arch/arm/kernel/iwmmxt.S
@@ -62,7 +62,7 @@
* r9 = ret_from_exception
* lr = undefined instr exit
*
- * called from prefetch exception handler with interrupts disabled
+ * called from prefetch exception handler with interrupts enabled
*/
ENTRY(iwmmxt_task_enable)
diff --git a/arch/arm/mach-ep93xx/crunch-bits.S b/arch/arm/mach-ep93xx/crunch-bits.S
index eaa5e34729d3..e96923a3017b 100644
--- a/arch/arm/mach-ep93xx/crunch-bits.S
+++ b/arch/arm/mach-ep93xx/crunch-bits.S
@@ -63,7 +63,7 @@
* r9 = ret_from_exception
* lr = undefined instr exit
*
- * called from prefetch exception handler with interrupts disabled
+ * called from prefetch exception handler with interrupts enabled
*/
ENTRY(crunch_task_enable)
inc_preempt_count r10, r3
diff --git a/arch/arm/vfp/entry.S b/arch/arm/vfp/entry.S
index f0759e70fb86..fe6ca574d093 100644
--- a/arch/arm/vfp/entry.S
+++ b/arch/arm/vfp/entry.S
@@ -22,11 +22,10 @@
@ r9 = normal "successful" return address
@ r10 = this threads thread_info structure
@ lr = unrecognised instruction return address
-@ IRQs disabled.
+@ IRQs enabled.
@
ENTRY(do_vfp)
inc_preempt_count r10, r4
- enable_irq
ldr r4, .LCvfp
ldr r11, [r10, #TI_CPU] @ CPU number
add r10, r10, #TI_VFPSTATE @ r10 = workspace