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Red Hat Bugzilla – Attachment 314376 Details for
Bug 458500
Badness at kernel/lockdep.c:2079 during installation
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Fix lockdep irq tracing bug on powerpc
powerpc-lockdep-problem.diff (text/plain), 1.25 KB, created by
IBM Bug Proxy
on 2008-08-15 07:20:39 UTC
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Description:
Fix lockdep irq tracing bug on powerpc
Filename:
MIME Type:
Creator:
IBM Bug Proxy
Created:
2008-08-15 07:20:39 UTC
Size:
1.25 KB
patch
obsolete
>powerpc: Fix lockdep IRQ tracing bug > >A small bogon sneaked into the ppc64 lockdep support. A test is >branching slightly off causing a clobbered register value to >overwrite the irq state under some circumstances. > >Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> >--- > >This explains some of the reported weird lockdep errors, maybe >even all of them, we'll see. > >We should probably backport that to 2.6.26-stable too, any candidate ? > >Index: linux-work/arch/powerpc/include/asm/irqflags.h >=================================================================== >--- linux-work.orig/arch/powerpc/include/asm/irqflags.h 2008-08-15 16:48:43.000000000 +1000 >+++ linux-work/arch/powerpc/include/asm/irqflags.h 2008-08-15 16:51:02.000000000 +1000 >@@ -20,7 +20,7 @@ > #define TRACE_ENABLE_INTS bl .trace_hardirqs_on > #define TRACE_DISABLE_INTS bl .trace_hardirqs_off > #define TRACE_AND_RESTORE_IRQ_PARTIAL(en,skip) \ >- cmpdi en, 0; \ >+ cmpdi en,0; \ > bne 95f; \ > stb en,PACASOFTIRQEN(r13); \ > bl .trace_hardirqs_off; \ >@@ -29,7 +29,8 @@ > li en,1; > #define TRACE_AND_RESTORE_IRQ(en) \ > TRACE_AND_RESTORE_IRQ_PARTIAL(en,96f); \ >-96: stb en,PACASOFTIRQEN(r13) >+ stb en,PACASOFTIRQEN(r13); \ >+96: > #else > #define TRACE_ENABLE_INTS > #define TRACE_DISABLE_INTS
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bug 458500
: 314376