linux-kernel - Re: [PATCH 2/3]: Remove perl from make headers

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Date:	Fri, 2 Jan 2009 10:09:14 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Rob Landley <rob@...dley.net>
Cc:	Embedded Linux mailing list <linux-embedded@...r.kernel.org>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH 2/3]: Remove perl from make headers_install

On Fri, Jan 02, 2009 at 02:14:32AM -0600, Rob Landley wrote:
> From: Rob Landley <rob@...dley.net>
> 
> Remove perl from make headers_install by replacing a perl script (doing
> a simple regex search and replace) with a smaller and faster shell script
> implementation.  The new shell script is a single for loop calling sed and
> piping its output through unifdef to produce the target file.

OK
> 
> Sam Ravnborg added this perl to 2.6.27.

Drop this part - this is just to make you happy and for no use for others.

> 
> Signed-off-by: Rob Landley <rob@...dley.net>
> ---
> 
>  scripts/Makefile.headersinst |    6 ++--
>  scripts/headers_install.pl   |   46 ---------------------------------
>  scripts/headers_install.sh   |   23 ++++++++++++++++
>  3 files changed, 26 insertions(+), 49 deletions(-)
> 
> --- /dev/null	2008-11-21 04:46:41.000000000 -0600
> +++ b/scripts/headers_install.sh	2008-12-15 22:09:45.000000000 -0600
> @@ -0,0 +1,23 @@
> +#!/bin/bash
> +
> +# Grab arguments
> +
> +INDIR="$1"
> +shift
> +OUTDIR="$1"
> +shift
> +ARCH="$1"
> +shift

Please add a short explanation what this file is used for
and what it does.
You can take more or less a direct copy from headers_install.pl

> +
> +# Iterate through files listed on command line
> +
> +for i in "$@"
> +do
> +	sed -r \
> +		-e 's/([ \t(])(__user|__force|__iomem)[ \t]/\1/g' \
> +		-e 's/__attribute_const__([ \t]|$)/\1/g' \
> +		-e 's@...nclude <linux/compiler.h>@@' "$INDIR/$i" |
> +	scripts/unifdef -U__KERNEL__ - > "$OUTDIR/$i"
> +done
> +
> +exit 0
> diff -r d9b501c91442 scripts/Makefile.headersinst
> --- a/scripts/Makefile.headersinst	Sun Dec 14 16:25:19 2008 -0800
> +++ b/scripts/Makefile.headersinst	Mon Dec 15 23:30:15 2008 -0600
> @@ -44,8 +44,8 @@
>  quiet_cmd_install = INSTALL $(printdir) ($(words $(all-files))\
>                              file$(if $(word 2, $(all-files)),s))
>        cmd_install = \
> -        $(PERL) $< $(srctree)/$(obj) $(install) $(SRCARCH) $(header-y); \
> -        $(PERL) $< $(objtree)/$(obj) $(install) $(SRCARCH) $(objhdr-y); \
> +		$(CONFIG_SHELL) $< $(srctree)/$(obj) $(install) $(SRCARCH) $(header-y); \
> +		$(CONFIG_SHELL) $< $(objtree)/$(obj) $(install) $(SRCARCH) $(objhdr-y); \

Stick to the coding style i the file and do not add your own.
Makefile.headersinst uses tabs for commands and not for indent.



	Sam
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