linux-kernel - Re: [PATCH] kbuild: Do not unnecessarily regenerate modules.builtin

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Date:	Thu, 11 Mar 2010 09:12:46 +0100
From:	Michal Marek <mmarek@...e.cz>
To:	Stephen Rothwell <sfr@...b.auug.org.au>
Cc:	linux-kbuild@...r.kernel.org, Eric Miao <eric.y.miao@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kbuild: Do not unnecessarily regenerate modules.builtin

Hi Stephen,

On Thu, Mar 11, 2010 at 04:03:26PM +1100, Stephen Rothwell wrote:
> This breaks a "make modules modules_install" type build:
[...]
> $ make O=../ntest.obj INSTALL_MOD_PATH=../ -s modules modules_install
> cp: cannot stat `/home/sfr/kernels/ntest.obj/modules.builtin': No such file or directory

Andrew reported this yesterday, too. The followin patch should fix it
(added to the for-next branch):

>From 73d1393eb8507ed5fd7f8e696f6b1ecc18035ebe Mon Sep 17 00:00:00 2001
From: Michal Marek <mmarek@...e.cz>
Date: Wed, 10 Mar 2010 12:28:58 +0100
Subject: [PATCH] kbuild: Generate modules.builtin in make modules_install

The previous approach didn't work if one did
make modules && make modules_install
Add modules.builtin as dependency of _modinst_, which is the target that
actually needs the file.

Reported-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Michal Marek <mmarek@...e.cz>
---
 Makefile |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/Makefile b/Makefile
index 160cada..b98943a 100644
--- a/Makefile
+++ b/Makefile
@@ -1086,7 +1086,7 @@ ifdef CONFIG_MODULES
 
 # By default, build modules as well
 
-all: modules modules.builtin
+all: modules
 
 #	Build modules
 #
@@ -1104,7 +1104,7 @@ modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
 	$(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
 
-%/modules.builtin: include/config/auto.conf | modules
+%/modules.builtin: include/config/auto.conf
 	$(Q)$(MAKE) $(modbuiltin)=$*
 
 
@@ -1117,7 +1117,7 @@ PHONY += modules_install
 modules_install: _modinst_ _modinst_post
 
 PHONY += _modinst_
-_modinst_:
+_modinst_: modules.builtin
 	@if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
 		echo "Warning: you may need to install module-init-tools"; \
 		echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
-- 
1.6.6.1

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