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Date:	Sun, 14 Apr 2013 09:25:54 +0200
From:	Marco Stornelli <>
To:	KOSAKI Motohiro <>
CC:, lkml <>
Subject: Re: Return value of __mm_populate


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!!

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