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Message-ID: <F7C8A4D3A9905B45A80E4C194793FA6515538BDFC7@PDSMSX501.ccr.corp.intel.com> Date: Thu, 1 Oct 2009 11:23:20 +0800 From: "Shi, Alex" <alex.shi@...el.com> To: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> CC: "Shi, Alex" <alex.shi@...el.com>, "Chen, Tim C" <tim.c.chen@...el.com> Subject: [PATCH] Fix kernel panic on i386 machine when booting with profile=2 Latest kernel has a kernel panic in booting on i386 machine when profile=2 setting in cmdline. Find it is due to 'sp' incorrect in profile_pc function. BUG: unable to handle kernel NULL pointer dereference at 00000246 IP: [<c01288b6>] profile_pc+0x2a/0x48 *pde = 00000000 Oops: 0000 [#1] SMP Signed-off-by: Alex Shi <alex.shi@...el.com> --- arch/x86/kernel/time.c | 5 +++++ 1 files changed, 5 insertions(+), 0 deletions(-) diff --git a/arch/x86/kernel/time.c b/arch/x86/kernel/time.c index dcb00d2..c4fedca 100644 --- a/arch/x86/kernel/time.c +++ b/arch/x86/kernel/time.c @@ -38,7 +38,12 @@ unsigned long profile_pc(struct pt_regs *regs) #ifdef CONFIG_FRAME_POINTER return *(unsigned long *)(regs->bp + sizeof(long)); #else +#ifdef CONFIG_X86_32 + unsigned long *sp = (unsigned long *)®s->sp; +#else unsigned long *sp = (unsigned long *)regs->sp; + +#endif /* * Return address is either directly at stack pointer * or above a saved flags. Eflags has bits 22-31 zero, -- 1.5.6.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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