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powerpc: Fix program check handling when lockdep is enabled 

In commit 54321242af ("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>
This commit is contained in:
Michael Ellerman 2012-02-20 21:32:30 +00:00 committed by Benjamin Herrenschmidt
parent 07d2f1a54a
commit 922b9f86a0
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc/kernel/exceptions-64s.S
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@ -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