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module: Use RCU in __is_module_percpu_address().

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The modules list can be accessed under RCU assumption.

Use RCU protection instead preempt_disable().

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250108090457.512198-12-bigeasy@linutronix.de
Signed-off-by: Petr Pavlu <petr.pavlu@suse.com>
This commit is contained in:
Sebastian Andrzej Siewior
2025-01-08 10:04:40 +01:00
committed by Petr Pavlu
parent 2ff49f8931
commit 2bee017741
1 changed files with 1 additions and 5 deletions
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6
kernel/module/main.c
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@@ -450,8 +450,7 @@ bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr)
struct module *mod;
unsigned int cpu;
preempt_disable();
guard(rcu)();
list_for_each_entry_rcu(mod, &modules, list) {
if (mod->state == MODULE_STATE_UNFORMED)
continue;
@@ -468,13 +467,10 @@ bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr)
per_cpu_ptr(mod->percpu,
get_boot_cpu_id());
}
preempt_enable();
return true;
}
}
}
preempt_enable();
return false;
}