linux-kernel - Re: Is per_cpu_ptr_to

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Message-ID: <CAOS58YP8o9xQvZJtpEJobChhJ+pSDQ9PqDwaXFS_h+JFd65jOw@mail.gmail.com>
Date:	Thu, 15 Dec 2011 10:40:42 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Petr Tesarik <ptesarik@...e.cz>
Cc:	Cong Wang <xiyou.wangcong@...il.com>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>,
	Vivek Goyal <vgoyal@...hat.com>, surovegin@...gle.com,
	gthelen@...gle.com
Subject: Re: Is per_cpu_ptr_to_phys broken?

Hello,

> Now, per_cpu_ptr() gives the correct virtual address, but
> per_cpu_ptr_to_phys() gets the result wrong, regardless whether it thinks that
> the address is in the first chunk or not:

Yeah, that's me forgetting "+ offset_in_page()" after vmalloc page
translation, which incidentally was also discovered by surovegin last
night. It has been broken forever, by which I mean longer than six
months. I wonder why this is coming up only now. Anyways, please send
me a patch, I'll be push it mainline & to stable.

Thanks.

-- 
tejun
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