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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/head_40x.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/head_40x.S')
-rw-r--r--arch/powerpc/kernel/head_40x.S4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S
index 872a6af83ba..4989661b710 100644
--- a/arch/powerpc/kernel/head_40x.S
+++ b/arch/powerpc/kernel/head_40x.S
@@ -394,7 +394,7 @@ label:
NORMAL_EXCEPTION_PROLOG
mr r4,r12 /* Pass SRR0 as arg2 */
li r5,0 /* Pass zero as arg3 */
- EXC_XFER_EE_LITE(0x400, handle_page_fault)
+ EXC_XFER_LITE(0x400, handle_page_fault)
/* 0x0500 - External Interrupt Exception */
EXCEPTION(0x0500, HardwareInterrupt, do_IRQ, EXC_XFER_LITE)
@@ -747,7 +747,7 @@ DataAccess:
mfspr r5,SPRN_ESR /* Grab the ESR, save it, pass arg3 */
stw r5,_ESR(r11)
mfspr r4,SPRN_DEAR /* Grab the DEAR, save it, pass arg2 */
- EXC_XFER_EE_LITE(0x300, handle_page_fault)
+ EXC_XFER_LITE(0x300, handle_page_fault)
/* Other PowerPC processors, namely those derived from the 6xx-series
* have vectors from 0x2100 through 0x2F00 defined, but marked as reserved.