Commit 3983da39 authored by Sebastian Andrzej Siewior's avatar Sebastian Andrzej Siewior Committed by Petr Pavlu
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static_call: Use RCU in all users of __module_text_address(). 



__module_text_address() can be invoked within a RCU section, there is no
requirement to have preemption disabled.

Replace the preempt_disable() section around __module_text_address()
with RCU.

Signed-off-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250108090457.512198-28-bigeasy@linutronix.de


Signed-off-by: default avatarPetr Pavlu <petr.pavlu@suse.com>
parent 7e74a7c0

kernel/static_call_inline.c

+6 −7
Original line number Diff line number Diff line
@@ -325,13 +325,12 @@ static int __static_call_mod_text_reserved(void *start, void *end) 
	struct module *mod;

	int ret;



	preempt_disable();

	scoped_guard(rcu) {

		mod = __module_text_address((unsigned long)start);

		WARN_ON_ONCE(__module_text_address((unsigned long)end) != mod);

		if (!try_module_get(mod))

			mod = NULL;

	preempt_enable();



	}

	if (!mod)

		return 0;