Hi Steven, Steven Rostedt hat am Wed 22. Dec, 21:42 (-0500) geschrieben: > On Sun, 2010-12-19 at 14:27 +0100, Jörg Sommer wrote: > > Did you've fixed this problem? The bug report is still marked as open. > > https://bugzilla.kernel.org/show_bug.cgi?id=16573 > > > > I just posted a patch to that BZ. I have it here below too. Could you > see if it fixes you problem. I only fixed the one place that you > reported, it may need more fixes (and in that case a macro to do the > work). > > I hit the same bug on my ppc64 box, and have a fix for that, that I'll > post to LKML tomorrow. > > -- Steve > > diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S > index ed4aeb9..915cc03 100644 > --- a/arch/powerpc/kernel/entry_32.S > +++ b/arch/powerpc/kernel/entry_32.S > @@ -879,7 +879,18 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_TYPE_47x) > */ > andi. r10,r9,MSR_EE > beq 1f > + /* > + * Since the ftrace irqsoff latency trace checks CALLER_ADDR1, > + * which is the stack frame here, we need to force a stack frame > + * in case we came from user space. > + */ > + stwu r1,-32(r1) > + mflr r0 > + stw r0,4(r1) > + stwu r1,-32(r1) > bl trace_hardirqs_on > + lwz r1,0(r1) > + lwz r1,0(r1) > lwz r9,_MSR(r1) > 1: > #endif /* CONFIG_TRACE_IRQFLAGS */
This patch eliminates the oopses. Bye, Jörg. -- Der Klügere gibt so lange nach bis er der Dumme ist.
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