linux-kernel - Re: Return value of __mm

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Message-ID: <51695273.6080800@alice.it>
Date:	Sat, 13 Apr 2013 14:41:23 +0200
From:	Marco <firefox82@...ce.it>
To:	linux-mm@...ck.org
CC:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: Return value of __mm_populate

Adding in cc: lkml

Il 13/04/2013 14:14, Marco Stornelli ha scritto:
> 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.
> So it seems to me that we could return to user space not expected value.
> I can't see them on the man page. In addition we shouldn't ever return
> ERESTARTSYS to the user space but EINTR. According to the man pages
> maybe we should return EAGAIN in these cases. Am I missing something?
>
> Thanks,
>
> Marco
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