[PATCH] powerpc: Fix MAX_STACK_TRACE_ENTRIES too low warning again

[Li Zhong]

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 at linux.vnet.ibm.com>
---
 arch/powerpc/kernel/entry_32.S |    2 --
 arch/powerpc/kernel/entry_64.S |    2 --
 arch/powerpc/kernel/process.c  |    1 +
 3 files changed, 1 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index e514de5..d22e73e 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -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
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index 3fe5259..48e8a86 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -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
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index ceb4e7b..2c9fc5e 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -973,6 +973,7 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
 	 */
 	sp -= sizeof(struct pt_regs);
 	kregs = (struct pt_regs *) sp;
+	kregs->gpr[1] = 0;
 	sp -= STACK_FRAME_OVERHEAD;
 	p->thread.ksp = sp;
 	p->thread.ksp_limit = (unsigned long)task_stack_page(p) +
-- 
1.7.1