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powerpc: Fix might-sleep warning in program check exception handler

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On 32-bit, the exception prolog for the program check exception doesn't
enable interrupts early on.  If it is an illegal instruction exception,
we read the instruction in order to emulate certain instructions, and
the get_user of the instruction triggers a WARN_ON since interrupts
are still disabled.  This adds a local_irq_enable() to enable
interrupts before reading the instruction.

Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Paul Mackerras 2006-03-03 17:11:40 +11:00
parent c499ec24c3
commit cd8a5673e9
1 changed files with 2 additions and 0 deletions
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2
arch/powerpc/kernel/traps.c
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@ -814,6 +814,8 @@ void __kprobes program_check_exception(struct pt_regs *regs)
return;
}
local_irq_enable();
/* Try to emulate it if we should. */
if (reason & (REASON_ILLEGAL | REASON_PRIVILEGED)) {
switch (emulate_instruction(regs)) {