Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
module: Use RCU in __find_kallsyms_symbol_value().
module::kallsyms can be accessed under RCU assumption.
Use rcu_dereference() to access module::kallsyms.
Update callers.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250108090457.512198-8-bigeasy@linutronix.de
Signed-off-by: Petr Pavlu <petr.pavlu@suse.com>
authored by
Sebastian Andrzej Siewior
and committed by
Petr Pavlu
f27d8ed6
febaa65c
+4
-13
+4
-13
kernel/module/kallsyms.c
+4
-13
kernel/module/kallsyms.c
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static unsigned long __find_kallsyms_symbol_value(struct module *mod, const char *name)
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{
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unsigned int i;
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struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms);
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struct mod_kallsyms *kallsyms = rcu_dereference(mod->kallsyms);
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for (i = 0; i < kallsyms->num_symtab; i++) {
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const Elf_Sym *sym = &kallsyms->symtab[i];
···
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/* Look for this name: can be of form module:name. */
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unsigned long module_kallsyms_lookup_name(const char *name)
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{
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unsigned long ret;
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/* Don't lock: we're in enough trouble already. */
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guard(rcu)();
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preempt_disable();
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ret = __module_kallsyms_lookup_name(name);
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preempt_enable();
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return ret;
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return __module_kallsyms_lookup_name(name);
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}
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unsigned long find_kallsyms_symbol_value(struct module *mod, const char *name)
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{
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unsigned long ret;
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preempt_disable();
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ret = __find_kallsyms_symbol_value(mod, name);
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preempt_enable();
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return ret;
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guard(rcu)();
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return __find_kallsyms_symbol_value(mod, name);
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}
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int module_kallsyms_on_each_symbol(const char *modname,