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authorThomas Gleixner <tglx@linutronix.de>2019-07-02 17:53:35 +0200
committerThomas Gleixner <tglx@linutronix.de>2019-07-03 09:04:06 +0200
commit7e8e6816c6495a1168f9a7a50125d82c23e59300 (patch)
treed608fc97cbbec910699dd53f473cb9813caad020 /kernel/stacktrace.c
parent6fbc7275c7a9ba97877050335f290341a1fd8dbf (diff)
stacktrace: Use PF_KTHREAD to check for kernel threads
!current->mm is not a reliable indicator for kernel threads as they might temporarily use a user mm. Check for PF_KTHREAD instead. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Mark Rutland <mark.rutland@arm.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Link: https://lkml.kernel.org/r/alpine.DEB.2.21.1907021750100.1802@nanos.tec.linutronix.de
Diffstat (limited to 'kernel/stacktrace.c')
-rw-r--r--kernel/stacktrace.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/stacktrace.c b/kernel/stacktrace.c
index 36139de0a3c4..c8d0f05721a1 100644
--- a/kernel/stacktrace.c
+++ b/kernel/stacktrace.c
@@ -228,7 +228,7 @@ unsigned int stack_trace_save_user(unsigned long *store, unsigned int size)
};
/* Trace user stack if not a kernel thread */
- if (!current->mm)
+ if (current->flags & PF_KTHREAD)
return 0;
arch_stack_walk_user(consume_entry, &c, task_pt_regs(current));

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