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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2012-03-07 16:48:45 +1100 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2012-03-09 10:55:08 +1100 |
| commit | a546498f3bf9aac311c66f965186373aee2ca0b0 (patch) | |
| tree | 86fb9a778aba26df3810acd8e52a921a2d84489b /arch/powerpc/kernel/head_fsl_booke.S | |
| parent | 1b70117924a4f254840ed70fbe3020d4519a1a9a (diff) | |
| download | op-kernel-dev-a546498f3bf9aac311c66f965186373aee2ca0b0.zip op-kernel-dev-a546498f3bf9aac311c66f965186373aee2ca0b0.tar.gz | |
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/head_fsl_booke.S')
| -rw-r--r-- | arch/powerpc/kernel/head_fsl_booke.S | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S index d5d78c4..28e6259 100644 --- a/arch/powerpc/kernel/head_fsl_booke.S +++ b/arch/powerpc/kernel/head_fsl_booke.S @@ -319,7 +319,7 @@ interrupt_base: mfspr r4,SPRN_DEAR /* Grab the DEAR, save it, pass arg2 */ andis. r10,r5,(ESR_ILK|ESR_DLK)@h bne 1f - EXC_XFER_EE_LITE(0x0300, handle_page_fault) + EXC_XFER_LITE(0x0300, handle_page_fault) 1: addi r3,r1,STACK_FRAME_OVERHEAD EXC_XFER_EE_LITE(0x0300, CacheLockingException) |
