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[PATCH 1/4] build system: section garbage collection for vmlinux

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From: Denys Vlasenko <vda.linux@...>
To: Sam Ravnborg <sam@...>
Cc: <linux-kernel@...>
Subject: [PATCH 1/4] build system: section garbage collection for vmlinux
Date: Tuesday, September 11, 2007 - 4:07 pm

This patch is needed for --gc-sections to work, regardless
of which final form that support will have.

This patch renames .text.xxx and .data.xxx sections
into .xxx.text and .xxx.data, respectively.

.bss.page_aligned (the only .bss.xxx -like section we have)
is renamed .bss.k.page_aligned. ".page_aligned.bss"
wouldn't work - gcc will assign such section attributes
which make it unmergeable with .bss. In fact, binutils ld
had a bug and instead of complaining was producing
broken vmlinux. The bug is fixed in binutils. Amazingly
fast reaction from binutils folks to bug reports! Thanks!

.bss.k.page_aligned is more-or-less ok, since it cannot collide
with gcc-produced sections due to second dot in the name. However,
should we want to do this in linker script:

.bss : { *(.bss) *(.bss.*) *(.bss.k.page_aligned))

it wouldn't work. But currently we don't need that.

If patch doesn't apply to a newer kernel,
you can regenerate it by running linux-2.6.23-rc4.0.fixname.sh
in a kernel free and rediffing it against unmodified one.

Please apply.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
--
vda
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Messages in current thread:
[PATCH 0/4] build system: section garbage collection for vml..., Denys Vlasenko, (Tue Sep 11, 4:05 pm)
Re: [PATCH 0/4] build system: section garbage collection for..., Abhishek Sagar, (Thu Sep 13, 2:26 pm)
Re: [PATCH 0/4] build system: section garbage collection for..., Sam Ravnborg, (Thu Sep 13, 2:35 pm)
Re: [PATCH 0/4] build system: section garbage collection for..., Abhishek Sagar, (Fri Sep 14, 2:06 pm)
Re: [PATCH 0/4] build system: section garbage collection for..., Andi Kleen, (Tue Sep 11, 5:03 pm)
Re: [PATCH 0/4] build system: section garbage collection for..., Denys Vlasenko, (Wed Sep 12, 4:19 pm)
[PATCH 1/4] build system: section garbage collection for vml..., Denys Vlasenko, (Tue Sep 11, 4:07 pm)
Re: [PATCH 1/4] build system: section garbage collection for..., Daniel Walker, (Tue Sep 11, 5:47 pm)
Re: [PATCH 1/4] build system: section garbage collection for..., Denys Vlasenko, (Wed Sep 12, 4:18 pm)
Re: [PATCH 1/4] build system: section garbage collection for..., Daniel Walker, (Wed Sep 12, 4:52 pm)
[PATCH 2/4] build system: section garbage collection for vml..., Denys Vlasenko, (Tue Sep 11, 4:10 pm)
[PATCH 3/4] build system: section garbage collection for vml..., Denys Vlasenko, (Tue Sep 11, 4:11 pm)
[PATCH 4/4] build system: section garbage collection for vml..., Denys Vlasenko, (Tue Sep 11, 4:22 pm)