Re: [PATCH] split UTS_RELEASE to a separate header.

[Brian Gerst <bgerst@didntduck.org>]

Michael S. Tsirkin wrote:
> Hello!
> Quoting r. Sam Ravnborg (sam@ravnborg.org) "Re: changing local version requires full rebuild":
> 
>>On Sun, Jan 16, 2005 at 05:22:42PM +0200, Michael S. Tsirkin wrote:
>>
>>>Hi!
>>>Is it just me, or does changing the local version always require
>>>a full kernel rebuild?
>>>
>>>If so, I'd like to fix it, since I like copying
>>>my kernel source with --preserve and changing the
>>>local version, then going back to the old version in case of
>>>a crash.
>>>Its important to change the local version to force 
>>>make install and make modules_install to put things in a separate
>>>directory.
>>
>>Just tried it out here.
>>After cp -Ra only a limited part of the kernel rebuilds.
>>o oiu.c in ieee directory - because it dependson the shell script
>>o A number of drivers that include version.h
>>	- This should be changed so local version does not affect
>>	  the reast of version.h.
>>o Other stuff that is always build if kernel has changed
>>
>>Do you use "echo -mylocalver > localversion" to change the local version?
>>
>>	Sam
> 
> 
> Well, we have
> /usr/src/linux-2.6.10-gold # grep -l UTS_RELEASE -rI . | wc -l
> 29
> grep -l version.h -rI . | fgrep -v .cmd | fgrep -v '.mod' | fgrep -e '.c' -e '.h' | wc -l
> 354
> 
> This means that about 300 files are compiled each time localversion changes,
> which do not actually use the local version.
> 
> So, let us split UTS_RELEASE to a separate header: release.h
> The following patch over 2.6.10 does that, and fixed the in-tree files that
> really need to include it.
> Works for me, and helps me cut down compilation time. Comments?
> 

Most of the stuff using UTS_RELEASE can use system_utsname.release 
instead (except boot code).  Most cases in drivers/ can simply be removed.

--
				Brian Gerst