linux-kernel - Re: [PATCH] openrisc: Define __kernel_size

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Message-ID: <871sx28bl0.fsf@linux-m68k.org>
Date:   Tue, 20 Dec 2016 23:44:43 +0100
From:   Andreas Schwab <schwab@...ux-m68k.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     kbuild test robot <lkp@...el.com>,
        Stafford Horne <shorne@...il.com>,
        "kbuild-all\@01.org" <kbuild-all@...org>,
        Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>,
        openrisc@...ts.librecores.org,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] openrisc: Define __kernel_size_t to suppress compiler warnings

On Dez 20 2016, Geert Uytterhoeven <geert@...ux-m68k.org> wrote:

> When I saw this patch, I was already a bit skeptical about it, but I noticed
> other architectures (e.g. avr32) are doing the same, so I didn't reply.
>
> In my experience, "format '%zu' expects argument of type 'size_t', but
> argument 3 has type 'unsigned int'" happens when using a compiler that
> was not configured to use the correct type (should be unsigned long) for
> size_t. Typically this happens when using a compiler not configured for
> a Linux target.

32-bit targets typically use unsigned int for size_t.  It is part of the
ABI, so all compilers must agree.  Since or32 is a out-of-tree port, and
gcc defaults to unsigned long for size_t, mismatches can happen if
people are using incomplete patches.

Andreas.

-- 
Andreas Schwab, schwab@...ux-m68k.org
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