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[S390] incomplete stack traces. 

show_stack() passes a pointer to the current stack frame to show_trace().
Because of tail call optimization the pointer doesn't point to the original
stack frame anymory and therefore traces are wrong. Don't pass the pointer
of the current stack frame to show_trace(). Instead let show_trace()
calculate the pointer on its own.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2006-06-29 14:56:23 +02:00 committed by Martin Schwidefsky
parent c406abd3a6
commit 7380534314
1 changed files with 3 additions and 5 deletions
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8
arch/s390/kernel/traps.c
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@ -150,13 +150,11 @@ void show_stack(struct task_struct *task, unsigned long *sp)
unsigned long *stack;
int i;
// debugging aid: "show_stack(NULL);" prints the
// back trace for this cpu.
if (!sp)
sp = task ? (unsigned long *) task->thread.ksp : __r15;
stack = task ? (unsigned long *) task->thread.ksp : __r15;
else
stack = sp;
stack = sp;
for (i = 0; i < kstack_depth_to_print; i++) {
if (((addr_t) stack & (THREAD_SIZE-1)) == 0)
break;