linux-kernel - Re: [PATCH] ARM: orion: fix orion_ge00_switch_board

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Date:   Thu, 22 Feb 2018 14:30:43 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Jason Cooper <jason@...edaemon.net>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Gregory Clement <gregory.clement@...e-electrons.com>,
        linux-arm-kernel@...ts.infradead.org, stable@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: orion: fix orion_ge00_switch_board_info
 initialization

On Wed, Feb 21, 2018 at 01:18:49PM +0100, Arnd Bergmann wrote:
> A section type mismatch warning shows up when building with LTO,
> since orion_ge00_mvmdio_bus_name was put in __initconst but not marked
> const itself:
> 
> include/linux/of.h: In function 'spear_setup_of_timer':
> arch/arm/mach-spear/time.c:207:34: error: 'timer_of_match' causes a section type conflict with 'orion_ge00_mvmdio_bus_name'
>  static const struct of_device_id timer_of_match[] __initconst = {
>                                   ^
> arch/arm/plat-orion/common.c:475:32: note: 'orion_ge00_mvmdio_bus_name' was declared here
>  static __initconst const char *orion_ge00_mvmdio_bus_name = "orion-mii";
>                                 ^
> 
> As pointed out by Andrew Lunn, it should in fact be 'const' but not
> '__initconst' because the string is never copied but may be accessed
> after the init sections are freed. To fix that, I get rid of the
> extra symbol and rewrite the initialization in a simpler way that
> assigns both the bus_id and modalias statically.
> 
> I spotted another theoretical bug in the same place, where d->netdev[i]
> may be an out of bounds access, this can be fixed by moving the device
> assignment into the loop.
> 
> Cc: stable@...r.kernel.org
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew