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| author | Michael Ellerman <michael@ellerman.id.au> | 2012-02-20 21:32:30 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2012-02-22 16:48:49 +1100 |
| commit | 922b9f86a020258d3ea3bfed27251efaed7a03a3 (patch) | |
| tree | 5cdb92aed142e9d96c0e38352cbc0d6cb2dd581f /arch | |
| parent | 07d2f1a54a78a648093f4f3a33aa86b03cf9e25f (diff) | |
| download | lwn-922b9f86a020258d3ea3bfed27251efaed7a03a3.tar.gz lwn-922b9f86a020258d3ea3bfed27251efaed7a03a3.zip | |
powerpc: Fix program check handling when lockdep is enabled
In commit 54321242afe ("Disable interrupts early in Program Check"), we
switched from enabling to disabling interrupts in program_check_common.
Whereas ENABLE_INTS leaves r3 untouched, if lockdep is enabled DISABLE_INTS
calls into lockdep code and will clobber r3. That means we pass a bogus
struct pt_regs* into program_check_exception() and all hell breaks loose.
So load our regs pointer into r3 after we call DISABLE_INTS.
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/kernel/exceptions-64s.S | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S index 3844ca7c5099..15c5a4f6de01 100644 --- a/arch/powerpc/kernel/exceptions-64s.S +++ b/arch/powerpc/kernel/exceptions-64s.S @@ -774,8 +774,8 @@ alignment_common: program_check_common: EXCEPTION_PROLOG_COMMON(0x700, PACA_EXGEN) bl .save_nvgprs - addi r3,r1,STACK_FRAME_OVERHEAD DISABLE_INTS + addi r3,r1,STACK_FRAME_OVERHEAD bl .program_check_exception b .ret_from_except |