From cd8a5673e9abb3fde0a1c25ee63a60fe1908c6f5 Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Fri, 3 Mar 2006 17:11:40 +1100 Subject: [PATCH] powerpc: Fix might-sleep warning in program check exception handler 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 --- arch/powerpc/kernel/traps.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c index 7509aa6474f2..98660aedeeb7 100644 --- a/arch/powerpc/kernel/traps.c +++ b/arch/powerpc/kernel/traps.c @@ -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)) {