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kasan: Record work creation stack trace with interrupts enabled

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Recording the work creation stack trace for KASAN reports in
call_rcu() is expensive, due to unwinding the stack, but also
due to acquiring depot_lock inside stackdepot (which may be contended).
Because calling kasan_record_aux_stack_noalloc() does not require
interrupts to already be disabled, this may unnecessarily extend
the time with interrupts disabled.

Therefore, move calling kasan_record_aux_stack() before the section
with interrupts disabled.

Acked-by: Marco Elver <elver@google.com>
Signed-off-by: Zqiang <qiang1.zhang@intel.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Zqiang 2021-12-26 08:52:04 +08:00 • committed by Paul E. McKenney
parent 1fe09ebe7a
commit d818cc76e2
1 changed files with 1 additions and 1 deletions
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2
kernel/rcu/tree.c
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@ -3060,8 +3060,8 @@ void call_rcu(struct rcu_head *head, rcu_callback_t func)
}
head->func = func;
head->next = NULL;
local_irq_save(flags);
kasan_record_aux_stack_noalloc(head);
local_irq_save(flags);
rdp = this_cpu_ptr(&rcu_data);
/* Add the callback to our list. */