From: WANG Cong <xiyou.wangcong@gmail.com>
To: Jeff Dike <jdike@addtoit.com>
Cc: akpm@osdl.org, WANG Cong <xiyou.wangcong@gmail.com>,
linux-kernel@vger.kernel.org,
user-mode-linux-devel@lists.sourceforge.net
Subject: Re: [uml-devel] [PATCH 2/19] UML - Tidy stub management code
Date: Tue, 29 Apr 2008 15:57:24 +0800 (CST) [thread overview]
Message-ID: <alpine.LFD.1.00.0804291556550.2548@localhost.localdomain> (raw)
In-Reply-To: <20080428154524.GE7334@c2.user-mode-linux.org>
On Mon, 28 Apr 2008, Jeff Dike wrote:
> On Sat, Apr 26, 2008 at 06:01:12PM +0800, WANG Cong wrote:
>> > + /*
>> > + * When the stub stops, we find the following values on the
>> > + * beginning of the stack:
>> > + * (long) return_value
>> > + * (long) offset to failed sycall data (0 if no error)
>> > + */
>> > + ret = *((unsigned long *) stack);
>>
>>
>> I am afraid the value will be truncated on 64bit machine, since
>> 'ret' is 'int' while 'stack' points to an 'unsigned long'.
>>
>> Is this expected?
>
> That's dubious, but I don't think it breaks anything. On LE, *(int *)
> and *(long *) will give you the same answer, and the value here is an
> error code, which fits into 32 bits.
So it's safe here.
OK. Thanks!
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prev parent reply other threads:[~2008-04-29 7:58 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-25 17:56 [uml-devel] [PATCH 2/19] UML - Tidy stub management code Jeff Dike
2008-04-26 10:01 ` WANG Cong
2008-04-28 15:45 ` Jeff Dike
2008-04-29 7:57 ` WANG Cong [this message]
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