From: "Andi Kleen" <ak@suse.de>
The test in in_exception_stack was done the wrong way round, which lead to
incorrect exception stack detection in the kernel backtracer.
Also fix a off by one in the test.
Noticed by Jan Beulich
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: <jbeulich@novell.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---
25-akpm/arch/x86_64/kernel/traps.c | 6 +++---
1 files changed, 3 insertions(+), 3 deletions(-)
diff -puN arch/x86_64/kernel/traps.c~x86_64-fix-exception-stack-detection-during-backtraces arch/x86_64/kernel/traps.c
--- 25/arch/x86_64/kernel/traps.c~x86_64-fix-exception-stack-detection-during-backtraces Wed Mar 23 15:39:10 2005
+++ 25-akpm/arch/x86_64/kernel/traps.c Wed Mar 23 15:39:10 2005
@@ -124,10 +124,10 @@ unsigned long *in_exception_stack(int cp
int k;
for (k = 0; k < N_EXCEPTION_STACKS; k++) {
struct tss_struct *tss = &per_cpu(init_tss, cpu);
- unsigned long end = tss->ist[k] + EXCEPTION_STKSZ;
+ unsigned long start = tss->ist[k] - EXCEPTION_STKSZ;
- if (stack >= tss->ist[k] && stack <= end)
- return (unsigned long *)end;
+ if (stack >= start && stack < tss->ist[k])
+ return (unsigned long *)tss->ist[k];
}
return NULL;
}
_