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| author |   Ingo Molnar <mingo@kernel.org> | 2015-10-28 13:17:01 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-10-28 13:17:20 +0100 |
| commit | e4340bbb07dd38339c0773543dd928886e512a57 (patch) | |
| tree | f38d9d2f929037325362328415b2a1e7bfe52a15 /kernel/trace/trace_stack.c | |
| parent | Merge branch 'for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcu (diff) | |
| parent | block: re-add discard_granularity and alignment checks (diff) | |
| download | wireguard-linux-e4340bbb07dd38339c0773543dd928886e512a57.tar.xz wireguard-linux-e4340bbb07dd38339c0773543dd928886e512a57.zip | |
Merge branch 'linus' into core/rcu, to fix up a semantic conflict
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/trace/trace_stack.c')
| -rw-r--r-- | kernel/trace/trace_stack.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c index b746399ab59c..8abf1ba18085 100644 --- a/kernel/trace/trace_stack.c +++ b/kernel/trace/trace_stack.c @@ -85,9 +85,19 @@ check_stack(unsigned long ip, unsigned long *stack) if (!object_is_on_stack(stack)) return; + /* Can't do this from NMI context (can cause deadlocks) */ + if (in_nmi()) + return; + local_irq_save(flags); arch_spin_lock(&max_stack_lock); + /* + * RCU may not be watching, make it see us. + * The stack trace code uses rcu_sched. + */ + rcu_irq_enter(); + /* In case another CPU set the tracer_frame on us */ if (unlikely(!frame_size)) this_size -= tracer_frame; @@ -169,6 +179,7 @@ check_stack(unsigned long ip, unsigned long *stack) } out: + rcu_irq_exit(); arch_spin_unlock(&max_stack_lock); local_irq_restore(flags); } |