linux-kernel - Re: [microblaze-uclinux] [RFC PATCH] linker script: unify usage of discard definition

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Message-ID: <4A519708.80608@monstr.eu>
Date:	Mon, 06 Jul 2009 08:17:44 +0200
From:	Michal Simek <monstr@...str.eu>
To:	microblaze-uclinux@...e.uq.edu.au
CC:	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Michal Simek <monstr@...str.eu>,
	Sam Ravnborg <sam@...nborg.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	Tony Luck <tony.luck@...el.com>,
	John Williams <john.williams@...alogix.com>
Subject: Re: [microblaze-uclinux] [RFC PATCH] linker script: unify usage of
 discard definition



Tejun Heo wrote:
> Discarded sections in different archs share some commonality but have
> considerable differences.  This led to linker script for each arch
> implementing its own /DISCARD/ definition, which makes maintaining
> tedious and adding new entries error-prone.
> 
> This patch makes all linker scripts to move discard definitions to the
> end of the linker script and use the common DISCARDS macro.  As ld
> uses the first matching section definition, archs can include default
> discarded sections by including them earlier in the linker script.
> 
> On x86-64 which explicitly includes EXIT_TEXT, this produces identical
> output as before and all but one archs included directives (include or
> discard) for all default discarded sections, so this patch shouldn't
> cause any behavior difference.
> 
> The only problem case is microblaze, which didn't explicitly included
> EXIT_TEXT and DATA but didn't discard them either leaving ld to create
> identically names output sections for them.  This patch will make the
> end result different by throwing away exit text and data.  It looks
> like the ommission was accidental and throwing away is the right thing
> to do, but I won't push it till someone who knows microblaze confirms
> it.

Please include EXIT_TEXT to .text section. EXIT_DATA can be discard. Patch is below.

Tested-by: Michal Simek <monstr@...str.eu>

Thanks,
Michal


diff --git a/arch/microblaze/kernel/vmlinux.lds.S b/arch/microblaze/kernel/vmlinux.lds.S
index aa5b0e9..39c0d0b 100644
--- a/arch/microblaze/kernel/vmlinux.lds.S
+++ b/arch/microblaze/kernel/vmlinux.lds.S
@@ -23,8 +23,8 @@ SECTIONS {
                _stext = . ;
                *(.text .text.*)
                *(.fixup)
-
-               *(.exitcall.exit)
+               EXIT_TEXT
+               EXIT_CALL
                SCHED_TEXT
                LOCK_TEXT
                KPROBES_TEXT


-- 
Michal Simek, Ing. (M.Eng)
w: www.monstr.eu p: +42-0-721842854
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