From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1cgU3o-0002Z0-Cz for barebox@lists.infradead.org; Wed, 22 Feb 2017 10:22:14 +0000 Date: Wed, 22 Feb 2017 11:21:49 +0100 From: Sascha Hauer Message-ID: <20170222102149.anazwahf4adk2zai@pengutronix.de> References: <20170221144751.27760-1-yegorslists@googlemail.com> <0CEC428C-E1EE-48A7-85CF-6FC90A22F47C@jcrosoft.com> <20170222100350.anjucafhspmwsa2c@pengutronix.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: Re: [PATCH] lib: xz: add support for bcj filters To: Yegor Yefremov Cc: Falco Hyfing , barebox On Wed, Feb 22, 2017 at 11:10:36AM +0100, Yegor Yefremov wrote: > On Wed, Feb 22, 2017 at 11:03 AM, Sascha Hauer wrote: > > On Wed, Feb 22, 2017 at 09:15:36AM +0100, Yegor Yefremov wrote: > >> On Wed, Feb 22, 2017 at 5:29 AM, Jean-Christophe PLAGNIOL-VILLARD > >> wrote: > >> > > >> >> On Feb 21, 2017, at 10:47 PM, yegorslists@googlemail.com wrote: > >> >> > >> >> From: Yegor Yefremov > >> >> > >> >> Add missing configuration options for various bcj filters. Without > >> >> these options the lib/xz/xz_dec_bcj.c file will be compiled, but all > >> >> filters will be disabled. > >> >> > >> >> Signed-off-by: Yegor Yefremov > >> >> --- > >> >> lib/Kconfig | 28 ++++++++++++++++++++++++++++ > >> >> 1 file changed, 28 insertions(+) > >> >> > >> >> diff --git a/lib/Kconfig b/lib/Kconfig > >> >> index f9f25bdef..83dd8e0a4 100644 > >> >> --- a/lib/Kconfig > >> >> +++ b/lib/Kconfig > >> >> @@ -22,6 +22,34 @@ config XZ_DECOMPRESS > >> >> bool "include xz uncompression support" > >> >> select UNCOMPRESS > >> >> > >> >> +if XZ_DECOMPRESS > >> >> + > >> >> +config XZ_DEC_X86 > >> >> + bool "x86 BCJ filter decoder" > >> >> + default y > >> > this need to be ARCH dependant > >> > >> Why? In Linux kernel it is not arch dependent, because AFAIK it > >> describes only compression particularities. This way you can extract > >> sqaushfs images on your ARM machine, that were compressed on SPARK > >> etc. > > > > So xz uses the Sparc bcj filter even when compressing ARM binaries? That > > doesn't sound very mature to me. > > This is just an xz command line option. So it is completely in the > user responsibility. I see. What's the default for this option? The architecture xz is running on? Otherwise we could do a: config XZ_DEC_ARM bool "ARM BCJ filter decoder" default y if ARCH_ARM On the other hand I'm not sure if the potential image size gain for disabling the unused bcj filters is even worth thinking about the problem... Sascha -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox