From: rmingming <mingming.nk@gmail.com>
To: linux-kernel@vger.kernel.org
Subject: Qustion on function try_module_get()
Date: Sat, 12 Jan 2008 13:52:20 +0800 [thread overview]
Message-ID: <4cc25cb20801112152q324c94aegb71a357d47ba3590@mail.gmail.com> (raw)
Hi,
I have a problem about the try_module_get function, I don't know if someone
removed the module just AFTER line 372 and BEFORE line 373, then
what happens? Because in this situation, the variable "module" will be
incorrect, and module_is_live function will lead to unpredicatable behaviour.
368 static inline int try_module_get(struct module *module)
369 {
370 int ret = 1;
371
372 if (module) {
373 unsigned int cpu = get_cpu();
374 if (likely(module_is_live(module)))
375 local_inc(&module->ref[cpu].count);
376 else
377 ret = 0;
378 put_cpu();
379 }
380 return ret;
381 }
Best wishes to all,
rmingming
reply other threads:[~2008-01-12 5:52 UTC|newest]
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