ChangeSet 1.2231.1.83, 2005/03/28 19:39:37-08:00, [EMAIL PROTECTED]
[PATCH] x86_64: Fix exception stack detection during backtraces
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 <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
traps.c | 6 +++---
1 files changed, 3 insertions(+), 3 deletions(-)
diff -Nru a/arch/x86_64/kernel/traps.c b/arch/x86_64/kernel/traps.c
--- a/arch/x86_64/kernel/traps.c 2005-03-28 21:24:42 -08:00
+++ b/arch/x86_64/kernel/traps.c 2005-03-28 21:24:42 -08:00
@@ -124,10 +124,10 @@
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;
}
-
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