linux-kernel - Re: [PATCH 09/34] x86: Allow to override the ROOT

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Message-ID: <20110411150820.GA22004@sepie.suse.cz>
Date:	Mon, 11 Apr 2011 17:08:21 +0200
From:	Michal Marek <mmarek@...e.cz>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org
Subject: Re: [PATCH 09/34] x86: Allow to override the ROOT_DEV variable

On Wed, Apr 06, 2011 at 09:47:44AM +0200, Michal Marek wrote:
> On 5.4.2011 17:30, H. Peter Anvin wrote:
> >> --- a/arch/x86/boot/Makefile
> >> +++ b/arch/x86/boot/Makefile
> >> @@ -13,7 +13,7 @@
> >>  # This can be either FLOPPY, CURRENT, /dev/xxxx or empty, in which case
> >>  # the default of FLOPPY is used by 'build'.
> >>  
> >> -ROOT_DEV	:= CURRENT
> >> +ROOT_DEV	?= CURRENT
> >>  
> >>  # If you want to preset the SVGA mode, uncomment the next line and
> >>  # set SVGA_MODE to whatever number you want.
> > 
> > Is this a good thing?  As far as I understand ?= it may mean picking
> > something up from the outside environment.
> > 
> > Since ROOT_DEV has been obsolete for 15 years or more, this would seem
> > to be a needless new error mode.
> 
> So can we just set the default root device to (0, 0)?

Like this?

Subject: [PATCH] x86: Do not set the rood_dev field in bzImage

This has been obsoleted by the root= commandline for several years.
People who still depend on this will surely have a copy of the rdev
command around, the rest of the world gets rid of another piece of
buildhost-dependent data in the build.

Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: x86@...nel.org
Signed-off-by: Michal Marek <mmarek@...e.cz>
---
 arch/x86/boot/Makefile |    9 +--------
 1 files changed, 1 insertions(+), 8 deletions(-)

diff --git a/arch/x86/boot/Makefile b/arch/x86/boot/Makefile
index f7cb086..95365a8 100644
--- a/arch/x86/boot/Makefile
+++ b/arch/x86/boot/Makefile
@@ -9,12 +9,6 @@
 # Changed by many, many contributors over the years.
 #
 
-# ROOT_DEV specifies the default root-device when making the image.
-# This can be either FLOPPY, CURRENT, /dev/xxxx or empty, in which case
-# the default of FLOPPY is used by 'build'.
-
-ROOT_DEV	:= CURRENT
-
 # If you want to preset the SVGA mode, uncomment the next line and
 # set SVGA_MODE to whatever number you want.
 # Set it to -DSVGA_MODE=NORMAL_VGA if you just want the EGA/VGA mode.
@@ -75,8 +69,7 @@ GCOV_PROFILE := n
 $(obj)/bzImage: asflags-y  := $(SVGA_MODE)
 
 quiet_cmd_image = BUILD   $@
-cmd_image = $(obj)/tools/build $(obj)/setup.bin $(obj)/vmlinux.bin \
-	$(ROOT_DEV) > $@
+cmd_image = $(obj)/tools/build $(obj)/setup.bin $(obj)/vmlinux.bin > $@
 
 $(obj)/bzImage: $(obj)/setup.bin $(obj)/vmlinux.bin $(obj)/tools/build FORCE
 	$(call if_changed,image)
-- 
1.7.4.1

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