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| author | Li Zhong <zhong@linux.vnet.ibm.com> | 2013-05-06 22:44:41 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-05-14 14:36:35 +1000 |
| commit | af945cf4bfc6586f0739b8c7f67af75576dec25e (patch) | |
| tree | 1b9221a0cd507aef6f62e4874fc33947e549923e /arch/powerpc/kernel/process.c | |
| parent | b80ec3dc8e100f6c8b27c02cbb6079d401c3a054 (diff) | |
| download | blackbird-op-linux-af945cf4bfc6586f0739b8c7f67af75576dec25e.tar.gz blackbird-op-linux-af945cf4bfc6586f0739b8c7f67af75576dec25e.zip | |
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>
Diffstat (limited to 'arch/powerpc/kernel/process.c')
| -rw-r--r-- | arch/powerpc/kernel/process.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index ceb4e7b62cf4..21981a89e394 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -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; |
