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[v3,08/28] module: Use RCU in module_kallsyms_on_each_symbol().

Message ID 20250108090457.512198-9-bigeasy@linutronix.de (mailing list archive)
State New
Headers show
Series module: Use RCU instead of RCU-sched. | expand

Commit Message

Sebastian Sewior Jan. 8, 2025, 9:04 a.m. UTC 
module::kallsyms can be accessed under RCU assumption.

Use rcu_dereference() to access module::kallsyms.
Update callers.

Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 kernel/module/kallsyms.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/kernel/module/kallsyms.c b/kernel/module/kallsyms.c
index e3c55bc879c11..0e8ec6486d95c 100644
--- a/kernel/module/kallsyms.c
+++ b/kernel/module/kallsyms.c
@@ -476,10 +476,8 @@  int module_kallsyms_on_each_symbol(const char *modname,
 		if (modname && strcmp(modname, mod->name))
 			continue;
 
-		/* Use rcu_dereference_sched() to remain compliant with the sparse tool */
-		preempt_disable();
-		kallsyms = rcu_dereference_sched(mod->kallsyms);
-		preempt_enable();
+		kallsyms = rcu_dereference_check(mod->kallsyms,
+						 lockdep_is_held(&module_mutex));
 
 		for (i = 0; i < kallsyms->num_symtab; i++) {
 			const Elf_Sym *sym = &kallsyms->symtab[i];