linux-kernel - [PATCH 3/3] build system: section garbage collection for vmlinux

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Date:	Wed, 5 Sep 2007 14:55:05 +0100
From:	Denys Vlasenko <vda.linux@...glemail.com>
To:	sam@...nborg.org
Cc:	kai@...maschewski.name, linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] build system: section garbage collection for vmlinux

On Wednesday 05 September 2007 14:49, Denys Vlasenko wrote:
> On Wednesday 05 September 2007 14:47, Denys Vlasenko wrote:
> > On Wednesday 05 September 2007 14:43, Denys Vlasenko wrote:
> > > These patches fix section names and add
> > > CONFIG_DISCARD_UNUSED_SECTIONS. It is not enabled
> > > unconditionally because only newest binutils have
> > > ld --gc-sections which is stable enough for kernel use.
> > > IOW: this is an experimental feature for now.
> > 
> > Part 1: fix section names over entire source (all arches).
> 
> Part 2: fix x86_64 vdso linker script to not produce
> broken vdso image with gcc -ffunction-sections -fdata-sections.

Part 3:

Makefile:
init/Kconfig:
  add config DISCARD_UNUSED_SECTIONS with appropriate
  big scary warning. It enables gcc and ld options
  for section garbage collection.

arch/x86_64/kernel/vmlinux.lds.S:
include/asm-generic/vmlinux.lds.h:
  add KEEP and SORT_BY_ALIGNMENT directives, as needed.

arch/frv/Makefile:
  had half-baked option similar to DISCARD_UNUSED_SECTIONS,
  replace it.

DISCARD_UNUSED_SECTIONS=n should be safe for all arches.

DISCARD_UNUSED_SECTIONS=y is usable only for x86_64 at the moment.
--
vda

View attachment "linux-2.6.23-rc4.3.gc.patch" of type "text/x-diff" (15679 bytes)