linux-kernel - Re: Return value of __mm

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Message-ID: <516A5A02.9090606@gmail.com>
Date:	Sun, 14 Apr 2013 09:25:54 +0200
From:	Marco Stornelli <marco.stornelli@...il.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
CC:	linux-mm@...ck.org, lkml <linux-kernel@...r.kernel.org>
Subject: Re: Return value of __mm_populate

Hi,

Il 14/04/2013 02:18, KOSAKI Motohiro ha scritto:
> (4/13/13 5:14 AM), Marco Stornelli wrote:
>> Hi,
>>
>> I was seeing the code of __mm_populate (in -next) and I've got a doubt
>> about the return value. The function __mlock_posix_error_return should
>> return a proper error for mlock, converting the return value from
>> __get_user_pages. It checks for EFAULT and ENOMEM. Actually
>> __get_user_pages could return, in addition, ERESTARTSYS and EHWPOISON.
>
> __get_user_pages doesn't return EHWPOISON if FOLL_HWPOISON is not specified.
> I'm not expert ERESTARTSYS. I understand correctly, ERESTARTSYS is only returned
> when signal received, and signal handling routine (e.g. do_signal) modify EIP and
> hidden ERESTARTSYS from userland generically.
>

Yep, you're right, the "magic" is inside the signal management. Thanks!!

Marco
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