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(parent: b1792e3) | patch
ftrace: do_each_pid_task() needs rcu lock
authorOleg Nesterov <oleg@redhat.com>
Tue, 3 Feb 2009 19:39:04 +0000 (20:39 +0100)
committerIngo Molnar <mingo@elte.hu>
Tue, 3 Feb 2009 21:50:58 +0000 (22:50 +0100)
commit229c4ef8ae56d69f8dec64533bf1c7f8070c1a4a
treee13a9ef3602f945ae51b73b592c8ae4d29e67ca3tree | snapshot (tar.gz zip)
parentb1792e367053968f2ddb48bc911d314143ce6242commit | diff
ftrace: do_each_pid_task() needs rcu lock

"ftrace: use struct pid" commit 978f3a45d9499c7a447ca7615455cefb63d44165
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>
kernel/trace/ftrace.c diff | blob | blame | history