From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Wed, 8 Jan 2025 10:04:37 +0100
Subject: [PATCH 08/28] module: Use RCU in module_kallsyms_on_each_symbol().

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>
Link: https://lore.kernel.org/r/20250108090457.512198-9-bigeasy@linutronix.de
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 kernel/module/kallsyms.c |    6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

@ kernel/module/kallsyms.c:479 @ int module_kallsyms_on_each_symbol(const
 		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];