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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2012-03-07 16:48:45 +1100
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2012-03-09 10:55:08 +1100
commita546498f3bf9aac311c66f965186373aee2ca0b0 (patch)
tree86fb9a778aba26df3810acd8e52a921a2d84489b /arch/powerpc/kernel/exceptions-64e.S
parent1b70117924a4f254840ed70fbe3020d4519a1a9a (diff)
powerpc: Call do_page_fault() with interrupts off
We currently turn interrupts back to their previous state before calling do_page_fault(). This can be annoying when debugging as a bad fault will potentially have lost some processor state before getting into the debugger. We also end up calling some generic code with interrupts enabled such as notify_page_fault() with interrupts enabled, which could be unexpected. This changes our code to behave more like other architectures, and make the assembly entry code call into do_page_faults() with interrupts disabled. They are conditionally re-enabled from within do_page_fault() in the same spot x86 does it. While there, add the might_sleep() test in the case of a successful trylock of the mmap semaphore, again like x86. Also fix a bug in the existing assembly where r12 (_MSR) could get clobbered by C calls (the DTL accounting in the exception common macro and DISABLE_INTS) in some cases. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> --- v2. Add the r12 clobber fix
Diffstat (limited to 'arch/powerpc/kernel/exceptions-64e.S')
-rw-r--r--arch/powerpc/kernel/exceptions-64e.S5
1 files changed, 2 insertions, 3 deletions
diff --git a/arch/powerpc/kernel/exceptions-64e.S b/arch/powerpc/kernel/exceptions-64e.S
index 429983c06f91..573613d747ac 100644
--- a/arch/powerpc/kernel/exceptions-64e.S
+++ b/arch/powerpc/kernel/exceptions-64e.S
@@ -313,7 +313,7 @@ interrupt_end_book3e:
NORMAL_EXCEPTION_PROLOG(0x300, PROLOG_ADDITION_2REGS)
mfspr r14,SPRN_DEAR
mfspr r15,SPRN_ESR
- EXCEPTION_COMMON(0x300, PACA_EXGEN, INTS_KEEP)
+ EXCEPTION_COMMON(0x300, PACA_EXGEN, INTS_DISABLE_ALL)
b storage_fault_common
/* Instruction Storage Interrupt */
@@ -321,7 +321,7 @@ interrupt_end_book3e:
NORMAL_EXCEPTION_PROLOG(0x400, PROLOG_ADDITION_2REGS)
li r15,0
mr r14,r10
- EXCEPTION_COMMON(0x400, PACA_EXGEN, INTS_KEEP)
+ EXCEPTION_COMMON(0x400, PACA_EXGEN, INTS_DISABLE_ALL)
b storage_fault_common
/* External Input Interrupt */
@@ -591,7 +591,6 @@ storage_fault_common:
mr r5,r15
ld r14,PACA_EXGEN+EX_R14(r13)
ld r15,PACA_EXGEN+EX_R15(r13)
- INTS_RESTORE_HARD
bl .do_page_fault
cmpdi r3,0
bne- 1f