linux-kernel - Re: [PATCH] move jazzsonic's probe function to .devinit.text

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Message-ID: <10f740e80903290155se064adan1fd07e0102b79c38@mail.gmail.com>
Date:	Sun, 29 Mar 2009 10:55:27 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Cc:	linux-kernel@...r.kernel.org, Ralf Baechle <ralf@...ux-mips.org>,
	Jeff Garzik <jeff@...zik.org>,
	"David S. Miller" <davem@...emloft.net>,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	Finn Thain <fthain@...egraphics.com.au>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] move jazzsonic's probe function to .devinit.text

2009/3/28 Uwe Kleine-König <u.kleine-koenig@...gutronix.de>:
> A pointer to jazz_sonic_probe is passed to the core via
> platform_driver_register and so the function must not disappear when the
> .init sections are discarded.  Otherwise (if also having HOTPLUG=y)
> unbinding and binding a device to the driver via sysfs will result in an
> oops as does a device being registered late.
>
> As noticed by Geert Uytterhoeven sonic_probe1 is called by
> jazz_sonic_probe, so the former has to move to .devinit.text, too.
>
> An alternative to this patch is using platform_driver_probe instead of
> platform_driver_register plus removing the pointer to the probe function
> from the struct platform_driver.
>
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> Cc: Ralf Baechle <ralf@...ux-mips.org>
> Cc: Jeff Garzik <jeff@...zik.org>
> Cc: David S. Miller <davem@...emloft.net>
> Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
> Cc: Finn Thain <fthain@...egraphics.com.au>
> Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> ---
> Hi Geert and Ralf,
>
> thanks for your feed-back.
>
> @Geert: Did you notice this, or your compiler?

I noticed this in macsonic, when I reviewed your patch.
As jazzsonic is very similar to macsonic, I suspected your patch had the
same issue there ;-)

Probably the compiler didn't tell you, because it inlined the other functions.
Still wondering why my compiler didn't tell me before. Maybe I just forgot to
build for Mac with CONFIG_DEBUG_SECTION_MISMATCH=y...

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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