linux-kernel - Re: [PATCH] m68k: Use generic strncpy_from_user(), strlen_user(), and strnlen

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Message-ID: <CAMuHMdV5GVZR1BvGD3EncDFfPt=Bt9ndkKE8Mp7euE9KoSaGNQ@mail.gmail.com>
Date:	Wed, 30 May 2012 13:20:02 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Philippe De Muyter <phdm@...qel.be>
Cc:	linux-m68k@...ts.linux-m68k.org, Greg Ungerer <gerg@...inux.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] m68k: Use generic strncpy_from_user(), strlen_user(), and strnlen_user()

On Wed, May 30, 2012 at 12:22 PM, Philippe De Muyter <phdm@...qel.be> wrote:
> On Tue, May 29, 2012 at 11:33:36PM +0200, Geert Uytterhoeven wrote:
>> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
>> ---
>> Do we also want
>>
>>     select HAVE_EFFICIENT_UNALIGNED_ACCESS if (!COLDFIRE && !M68000)
>
> Sorry, I did not follow what happened to unaligned accesses, but
> CPU32 family (at least 68340) crashes on unaligned accesses.

We don't seem to have CONFIG_M68340 in arch/m68k/Kconfig.cpu?
But Freescale's website confirms both 68340 and 68360 are CPU32.

arch/m68k/include/asm/unaligned.h assumes CPU32 (CONFIG_MCPU32)
can do unaligned accesses:

#if defined(CONFIG_COLDFIRE) || defined(CONFIG_M68000)
#include <linux/unaligned/be_struct.h>
#include <linux/unaligned/le_byteshift.h>
#include <linux/unaligned/generic.h>

#define get_unaligned   __get_unaligned_be
#define put_unaligned   __put_unaligned_be

#else
/*
 * The m68k can do unaligned accesses itself.
 */
#include <linux/unaligned/access_ok.h>
#include <linux/unaligned/generic.h>

#define get_unaligned   __get_unaligned_be
#define put_unaligned   __put_unaligned_be

#endif

Is this wrong?

However, for CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS,
the question is not whether unaligned accesses are supported, but
whether they are more efficient than byte copies when copying larger blocks.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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