linux-kernel - Re: [PATCH -next] xtensa: Fix fix linker script transformation for .text / .text.fixup

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Message-ID: <CAMo8BfKyu+PRg3PmxP1aRt2vSpcZtA0ZmddzjE4h4GKi4vrfYw@mail.gmail.com>
Date:	Wed, 8 Apr 2015 09:14:22 +0300
From:	Max Filippov <jcmvbkbc@...il.com>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Chris Zankel <chris@...kel.net>,
	"linux-xtensa@...ux-xtensa.org" <linux-xtensa@...ux-xtensa.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH -next] xtensa: Fix fix linker script transformation for
 .text / .text.fixup

Hi Guenter,

On Wed, Apr 8, 2015 at 8:49 AM, Guenter Roeck <linux@...ck-us.net> wrote:
> Commit 779c88c94c34 ("ARM: 8321/1: asm-generic: introduce .text.fixup
> input section") introduced a new .text.fixup section which is merged
> with .text at link time. This causes xtensa builds to fail with lots
> of error messages similar to the following.
>
> lib/lib.a(kobject.o): In function `kobject_create':
> (.text+0x498): dangerous relocation: l32r: literal placed after use:
>                                      (.literal+0x150)
>
> Linker script transformation needs to be updated to detect and handle
> the new section.

I've posted a patch for it to the linux-xtensa ML a while ago:
http://lists.linux-xtensa.org/pipermail/linux-xtensa/Week-of-Mon-20150330/001913.html

> Fixes: 779c88c94c34 ("ARM: 8321/1: asm-generic: introduce .text.fixup
>                      input section")
> Cc: Ard Biesheuvel <ard.biesheuvel@...aro.org>
> Cc: Arnd Bergmann <arnd@...db.de>
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> ---
>  arch/xtensa/kernel/Makefile | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/arch/xtensa/kernel/Makefile b/arch/xtensa/kernel/Makefile
> index 18d962a..d3a0f0f 100644
> --- a/arch/xtensa/kernel/Makefile
> +++ b/arch/xtensa/kernel/Makefile
> @@ -29,6 +29,7 @@ AFLAGS_head.o += -mtext-section-literals
>
>  sed-y = -e 's/\*(\(\.[a-z]*it\|\.ref\|\)\.text)/*(\1.literal \1.text)/g' \
>         -e 's/\.text\.unlikely/.literal.unlikely .text.unlikely/g'       \
> +       -e 's/\*(\(\.text .*\))/*(.literal \1)/g'                        \

This doesn't handle literals for .text.fixup AFAICT.

-- 
Thanks.
-- Max
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