diff mbox series

[v2,23/28] jump_label: Use RCU in all users of __module_text_address().

Message ID 20241220174731.514432-24-bigeasy@linutronix.de (mailing list archive)
State New
Headers show
Series module: Use RCU instead of RCU-sched. | expand

Commit Message

Sebastian Andrzej Siewior Dec. 20, 2024, 5:41 p.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: Ard Biesheuvel <ardb@kernel.org>
Cc: Jason Baron <jbaron@akamai.com>
Cc: Josh Poimboeuf <jpoimboe@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 kernel/jump_label.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)
diff mbox series

Patch

diff --git a/kernel/jump_label.c b/kernel/jump_label.c
index 7fcf4017cb383..7cb19e6014266 100644
--- a/kernel/jump_label.c
+++ b/kernel/jump_label.c
@@ -653,13 +653,12 @@  static int __jump_label_mod_text_reserved(void *start, void *end)
 	struct module *mod;
 	int ret;
 
-	preempt_disable();
-	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();
-
+	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;
+	}
 	if (!mod)
 		return 0;