powerpc: Fix MAX_STACK_TRACE_ENTRIES too low warning again
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>
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@ -439,8 +439,6 @@ ret_from_fork:
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ret_from_kernel_thread:
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ret_from_kernel_thread:
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REST_NVGPRS(r1)
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REST_NVGPRS(r1)
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bl schedule_tail
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bl schedule_tail
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li r3,0
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stw r3,0(r1)
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mtlr r14
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mtlr r14
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mr r3,r15
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mr r3,r15
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PPC440EP_ERR42
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PPC440EP_ERR42
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@ -376,8 +376,6 @@ _GLOBAL(ret_from_fork)
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_GLOBAL(ret_from_kernel_thread)
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_GLOBAL(ret_from_kernel_thread)
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bl .schedule_tail
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bl .schedule_tail
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REST_NVGPRS(r1)
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REST_NVGPRS(r1)
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li r3,0
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std r3,0(r1)
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ld r14, 0(r14)
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ld r14, 0(r14)
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mtlr r14
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mtlr r14
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mr r3,r15
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mr r3,r15
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@ -971,6 +971,7 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
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* do some house keeping and then return from the fork or clone
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* do some house keeping and then return from the fork or clone
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* system call, using the stack frame created above.
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* system call, using the stack frame created above.
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*/
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*/
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((unsigned long *)sp)[0] = 0;
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sp -= sizeof(struct pt_regs);
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sp -= sizeof(struct pt_regs);
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kregs = (struct pt_regs *) sp;
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kregs = (struct pt_regs *) sp;
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sp -= STACK_FRAME_OVERHEAD;
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sp -= STACK_FRAME_OVERHEAD;
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