show_stack(current or NULL, NULL) is used by arch-independent code to
dump backtrace of the current task; however, sparc32 show_stack()
doesn't implement it and wouldn't print any backtrace when NULL @_ksp
is specfied.
Make show_stack() acquire and use %fp if @tsk is NULL or current and
@_ksp is NULL. This makes %fp fetching in dump_stack() unnecessary.
Make it use NULL for @_ksp instead.
Only compile tested.
Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
---
arch/sparc/kernel/process_32.c | 16 +++++++---------
1 file changed, 7 insertions(+), 9 deletions(-)
diff --git a/arch/sparc/kernel/process_32.c b/arch/sparc/kernel/process_32.c
index 62eede1..0d57b24 100644
--- a/arch/sparc/kernel/process_32.c
+++ b/arch/sparc/kernel/process_32.c
@@ -153,11 +153,13 @@ void show_stack(struct task_struct *tsk, unsigned long *_ksp)
struct reg_window32 *rw;
int count = 0;
- if (tsk != NULL)
- task_base = (unsigned long) task_stack_page(tsk);
- else
- task_base = (unsigned long) current_thread_info();
+ if (!tsk)
+ tsk = current;
+ if (tsk == current && !_ksp)
+ __asm__ __volatile__("mov %%fp, %0" : "=r" (_ksp));
+
+ task_base = (unsigned long) task_stack_page(tsk);
fp = (unsigned long) _ksp;
do {
/* Bogus frame pointer? */
@@ -175,11 +177,7 @@ void show_stack(struct task_struct *tsk, unsigned long *_ksp)
void dump_stack(void)
{
- unsigned long *ksp;
-
- __asm__ __volatile__("mov %%fp, %0"
- : "=r" (ksp));
- show_stack(current, ksp);
+ show_stack(current, NULL);
}
EXPORT_SYMBOL(dump_stack);
--
1.8.1.4
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