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powerpc: Fix MAX_STACK_TRACE_ENTRIES too low warning again

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Saw this warning again, and this time from the ret_from_fork path.

It seems we could clear the back chain earlier in copy_thread(), which
could cover both path, and also fix potential lockdep usage in
schedule_tail(), or exception occurred before we clear the back chain.

Signed-off-by: Li Zhong <zhong@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Li Zhong 2013-05-06 22:44:41 +00:00 committed by Benjamin Herrenschmidt
parent b80ec3dc8e
commit af945cf4bf
3 changed files with 1 additions and 4 deletions
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2
arch/powerpc/kernel/entry_32.S
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@ -439,8 +439,6 @@ ret_from_fork:
ret_from_kernel_thread:
REST_NVGPRS(r1)
bl schedule_tail
li r3,0
stw r3,0(r1)
mtlr r14
mr r3,r15
PPC440EP_ERR42

2
arch/powerpc/kernel/entry_64.S
View File

@ -376,8 +376,6 @@ _GLOBAL(ret_from_fork)
_GLOBAL(ret_from_kernel_thread)
bl .schedule_tail
REST_NVGPRS(r1)
li r3,0
std r3,0(r1)
ld r14, 0(r14)
mtlr r14
mr r3,r15

1
arch/powerpc/kernel/process.c
View File

@ -971,6 +971,7 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
* do some house keeping and then return from the fork or clone
* system call, using the stack frame created above.
*/
((unsigned long *)sp)[0] = 0;
sp -= sizeof(struct pt_regs);
kregs = (struct pt_regs *) sp;
sp -= STACK_FRAME_OVERHEAD;