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Date: Fri, 24 Apr 2009 09:14:40 +0900 From: Paul Mundt <lethal@...ux-sh.org> To: Tim Abbott <tabbott@....EDU> Cc: Linus Torvalds <torvalds@...ux-foundation.org>, Linux kernel mailing list <linux-kernel@...r.kernel.org>, Anders Kaseorg <andersk@....edu>, Waseem Daher <wdaher@....edu>, Denys Vlasenko <vda.linux@...glemail.com>, Rusty Russell <rusty@...tcorp.com.au>, Andi Kleen <andi@...stfloor.org>, "H. Peter Anvin" <hpa@...or.com>, Stephen Rothwell <sfr@...b.auug.org.au>, Jeff Arnold <jbarnold@....edu>, Andrew Morton <akpm@...ux-foundation.org>, Jon Masters <jonathan@...masters.org>, Masami Hiramatsu <mhiramat@...hat.com>, Theodore Ts'o <tytso@....edu>, Nikanth Karthikesan <knikanth@...e.de>, Arjan van de Ven <arjan@...radead.org>, Am?rico Wang <xiyou.wangcong@...il.com>, Ralf Baechle <ralf@...ux-mips.org>, Kyle McMartin <kyle@...artin.ca>, David Howells <dhowells@...hat.com> Subject: Re: [PATCH v3 0/3] Add support for compiling with -ffunction-sections -fdata-sections On Thu, Apr 23, 2009 at 04:48:52PM -0400, Tim Abbott wrote: > On Mon, 20 Apr 2009, Linus Torvalds wrote: > > > I'd be ok with merging it, but I haven't really gotten a strong feeling > > that anybody is going to enable it or use it. > > Linus, > > Would you be willing to merge the first 3 patches in this patch series at > this point? I'm resending these patches to resolve some conflicts that > was recently introduced. > > To summarize the discussion, there are three uses for this code that have > significant interest. > > One is decreasing the kernel size. Denys Vlasenko has numbers that using > the linker's --gc-sections option (for which these patches are a > prerequisite) saves 10% of the kernel size when CONFIG_MODULES=n, and 1% > when CONFIG_MODULES=y. Paul Mundt thinks many embedded users would use > this if it were available. > > A related use is cleaning up a lot of ifdefs that exist only to decrease > the kernel size. Several developers commented favorably on the direction > of using section garbage collection for dead code removal. > > Finally, Ksplice depends on the option added by this patch series. > > The first 3 patches in this patch series fix problems associated with > using -ffunction-sections. As there are some architectures currently > using -ffunction-sections, these should ideally be merged now, especially > the first patch which involves scattered changes. > Given that this fixes issues with the existing in-tree users, it would help to make them aware of this also.. added to the CC. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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