linux-kernel - Re: mlock() return value issue in kernel 2.6.23.17

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Message-Id: <20081008094111.9BBF.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Wed,  8 Oct 2008 09:59:13 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	"Yanping Du" <Yanping.Du@...adomain.com>
Cc:	kosaki.motohiro@...fujitsu.com, <linux-kernel@...r.kernel.org>,
	<yanping.du@...il.com>
Subject: Re: mlock() return value issue in kernel 2.6.23.17

Hi Yanping,

> Hi Kosaki,
> 
>   Seems SUSv3 has more requirements beyond errno return code. Upon
> failure (EAGAIN, etc), it requires .no change is made to any locks in
> the address space of the process., but Linux mlock(2) will set vma flag
> as VM_LOCKED even if make_pages_present() fails for some pages in the
> vma. Any comment on this ?
> 
> SUSv3: http://www.unix.org/single_unix_specification/
> 
> "Upon successful completion, the mlock() and munlock() functions shall
> return a value of zero. Otherwise, no change is made to any locks in the
> address space of the process, and the function shall return a value of
> -1 and set errno to indicate the error."

Correct.

However, I haven't seen this behavior cause any trouble.
Do you know any case?

So, if nobody feel awful, I don't interest it so much ;)



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