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Message-Id: <20071114123513.fbff2683.wjiang@resilience.com>
Date: Wed, 14 Nov 2007 12:35:13 +0800
From: Jerry Jiang <wjiang@...ilience.com>
To: linux-kernel@...r.kernel.org
Subject: [LOCK] Is it really necessary to use a "big module lock"?
Hi all,
I came across a question when review other's module code.
something like:
int __init module_init()
{
down_interruptible(the_big_module_sem);
// code for init...
up(the_big_module_sem);
}
void __exit module_exit()
{
down_interruptible(the_big_module_sem);
// code for exit...
up(the_big_module_sem);
}
My question is:
- Is the lock truly necessary?
- If adding it into code, what happens?
Thank you
-- Jerry
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