ftrace: do_each_pid_task() needs rcu lock

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"ftrace: use struct pid" commit 978f3a45d9
converted ftrace_pid_trace to "struct pid*".

But we can't use do_each_pid_task() without rcu_read_lock() even if
we know the pid itself can't go away (it was pinned in ftrace_pid_write).
The exiting task can detach itself from this pid at any moment.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

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Oleg Nesterov 2009-02-03 20:39:04 +01:00 • committed by Ingo Molnar

parent b1792e3670

commit 229c4ef8ae

1 changed files with 5 additions and 0 deletions

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kernel/trace/ftrace.c

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