* Björn Steinbrink <[email protected]> wrote:
> > and of course i'm happy to test any patch that is simpler than the
> > brutal revert i sent.
>
> wrmsrl() looks broken, dropping the upper 32bits of the value to be
> written. Does this help?
this did the trick, rc6 plus your fix and the NMI watchdog works again!
Thanks! I suspect other code (oprofile?) broke due to this too.
below is a tidied up patch for upstream application. Must-have for
2.6.22.
Ingo
----------------->
From: Björn Steinbrink <[email protected]>
Subject: [patch, 2.6.22-rc6] fix nmi_watchdog=2 bootup hang, take #2
wrmsrl() is broken, dropping the upper 32bits of the value to be
written. This broke the NMI watchdog on AMD hardware. (and it
probably broke other code too.)
Signed-off-by: Ingo Molnar <[email protected]>
---
include/asm-i386/paravirt.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
Index: linux/include/asm-i386/paravirt.h
===================================================================
--- linux.orig/include/asm-i386/paravirt.h
+++ linux/include/asm-i386/paravirt.h
@@ -539,7 +539,7 @@ static inline int paravirt_write_msr(uns
val = paravirt_read_msr(msr, &_err); \
} while(0)
-#define wrmsrl(msr,val) ((void)paravirt_write_msr(msr, val, 0))
+#define wrmsrl(msr,val) wrmsr(msr, (u32)((u64)(val)), ((u64)(val))>>32)
#define wrmsr_safe(msr,a,b) paravirt_write_msr(msr, a, b)
/* rdmsr with exception handling */
-
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