linux-kernel - Re: 2.6.20: Rebuild after trivial patch rebuilds way too much

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Message-Id: <200702131057.l1DAvqaw012898@sullivan.realtime.net>
Date:	Tue, 13 Feb 2007 04:57:52 -0600 (CST)
From:	Milton Miller <miltonm@....com>
To:	Andrey Borzenkov <arvidjaar@...l.ru>
Cc:	<linux-kernel@...r.kernel.org>
Subject: Re: 2.6.20: Rebuild after trivial patch rebuilds way too much

On Mon, 12 Feb 2007 12:38:15 -0500 (EST), Andrey Borzenkov wrote:
> Is not it too much fore a trivial two lines patch to a single file?
> 
> {pts/1}% stg import
> ~/patch/Re_2_6_20_rc6_libata_PATA_ATAPI_CDROM_is_not_working.patch
> Importing
> patch "Re_2_6_20_rc6_libata_PATA_ATAPI_CDROM_is_not_working.patch"... done
> Now at patch "Re_2_6_20_rc6_libata_PATA_ATAPI_CDROM_is_not_working.patch"
> {pts/1}% make -C ~/src/linux-git O=$HOME/build/linux-2.6.20
> make: Entering directory `/home/bor/src/linux-git'
.. 120 lines of make ...

You can ask Kbuild why its building with make V=2.

make V=2 -C ~/src/linux-git O=$HOME/build/linux-2.6.20

from scripts/Kbuild.include:
###
# why - tell why a a target got build
#       enabled by make V=2
#       Output (listed in the order they are checked):
#          (1) - due to target is PHONY
#          (2) - due to target missing
#          (3) - due to: file1.h file2.h
#          (4) - due to command line change
#          (5) - due to missing .cmd file
#          (6) - due to target not in $(targets)
# (1) PHONY targets are always build
# (2) No target, so we better build it
# (3) Prerequisite is newer than target
# (4) The command line stored in the file named dir/.target.cmd
#     differed from actual command line. This happens when compiler
#     options changes
# (5) No dir/.target.cmd file (used to store command line)
# (6) No dir/.target.cmd file and target not listed in $(targets)
#     This is a good hint that there is a bug in the kbuild file

Regards,
milton
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