linux-kernel - Re: [ 016/173] use clamp

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Message-ID: <20121229080742.GD18903@elie.Belkin>
Date:	Sat, 29 Dec 2012 00:07:43 -0800
From:	Jonathan Nieder <jrnieder@...il.com>
To:	Ben Hutchings <ben@...adent.org.uk>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Kees Cook <keescook@...omium.org>,
	Fengguang Wu <fengguang.wu@...el.com>,
	David Howells <dhowells@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [ 016/173] use clamp_t in UNAME26 fix

Ben Hutchings wrote:

> The min/max call needed to have explicit types on some architectures
> (e.g. mn10300). Use clamp_t instead to avoid the warning:
> 
>   kernel/sys.c: In function 'override_release':
>   kernel/sys.c:1287:10: warning: comparison of distinct pointer types lacks a cast [enabled by default]
>
> Reported-by: Fengguang Wu <fengguang.wu@...el.com>
[...]
> -		copy = min(sizeof(buf), max_t(size_t, 1, len));

I don't understand how this happens given that v2.6.36-rc1~68
(MN10300: Fix size_t and ssize_t, 2010-08-12) was supposed to fix this
kind of thing.  Doesn't sizeof(buf) have type size_t already (C99
§6.5.3.4 "the sizeof operator" ¶4)?

What version of gcc produces this warning?

Puzzled,
Jonathan
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