diff mbox series

[v3,26/28] kprobes: Use RCU in all users of __module_text_address().

Message ID 20250108090457.512198-27-bigeasy@linutronix.de (mailing list archive)
State New
Headers show
Series module: Use RCU instead of RCU-sched. | expand

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Commit Message

Sebastian Andrzej Siewior Jan. 8, 2025, 9:04 a.m. UTC 
__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.

Cc: David S. Miller <davem@davemloft.net>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Naveen N Rao <naveen@kernel.org>
Cc: linux-trace-kernel@vger.kernel.org
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 kernel/kprobes.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index b027a4030976a..22e47a27df4aa 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -1566,7 +1566,7 @@  static int check_kprobe_address_safe(struct kprobe *p,
 	if (ret)
 		return ret;
 	jump_label_lock();
-	preempt_disable();
+	rcu_read_lock();
 
 	/* Ensure the address is in a text area, and find a module if exists. */
 	*probed_mod = NULL;
@@ -1612,7 +1612,7 @@  static int check_kprobe_address_safe(struct kprobe *p,
 	}
 
 out:
-	preempt_enable();
+	rcu_read_unlock();
 	jump_label_unlock();
 
 	return ret;