linux-kernel - Re: [GIT] kbuild

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Message-ID: <20090420024954.GW26366@ZenIV.linux.org.uk>
Date:	Mon, 20 Apr 2009 03:49:54 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Sam Ravnborg <sam@...nborg.org>, Paul Mundt <lethal@...ux-sh.org>,
	linux-kbuild <linux-kbuild@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Russell King <rmk+lkml@....linux.org.uk>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [GIT] kbuild

On Mon, Apr 20, 2009 at 02:41:58AM +0100, Al Viro wrote:
> On Sun, Apr 19, 2009 at 05:52:32PM -0700, Linus Torvalds wrote:
> > 
> > 
> > On Mon, 20 Apr 2009, Sam Ravnborg wrote:
> > > 
> > > You will soon see a path from me where I fix sh too.
> > 
> > Can we do a global 'sed s:asm/asm-offsets.h:generated/asm-offsets.h:g' 
> > thing too? And then get rid of the include/asm symlink?
> > 
> > That asm-offsets.h mess is scary. I don't quite know why kvm on ia64 seems 
> > to do it's own asm-offsets.h file, for example. And arch/blackfin/Makefile 
> > mentions arch/$(ARCH)/include/asm/asm-offsets.h (but does it actually do 
> > one?).
> 
> We'll need to update uml as well (contents of shared/kern_constants.h)

BTW, while we are at it...  There's a way to deal with arch/um without
that kind of contortions, provided that we are willing to use -idirafter.

For the current tree the minimal patch would be just this, and after that
we can simply replace all kern_constants.h includes with asm/asm-offsets.h
or generated/asm-offsets.h.  And remove kern_constants.h completely once
that is done.

Moreover, once include/generated gets in, we can move user_constants.h
over there and lose the "add -I$(SHARED_HEADERS) to ARCH_INCLUDE for
O=... builds bit" in arch/um/Makefile as well.


diff --git a/arch/um/Makefile b/arch/um/Makefile
index 0728def..dce2d7f 100644
--- a/arch/um/Makefile
+++ b/arch/um/Makefile
@@ -47,7 +47,7 @@ KBUILD_AFLAGS += $(ARCH_INCLUDE)
 
 USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -D__KERNEL__,,\
 	$(patsubst -I%,,$(KBUILD_CFLAGS)))) $(ARCH_INCLUDE) $(MODE_INCLUDE) \
-	$(filter -I%,$(CFLAGS)) -D_FILE_OFFSET_BITS=64
+	$(filter -I%,$(CFLAGS)) -D_FILE_OFFSET_BITS=64 -idirafter include
 
 include $(srctree)/$(ARCH_DIR)/Makefile-$(SUBARCH)
 
@@ -150,6 +150,6 @@ $(SHARED_HEADERS)/user_constants.h: $(ARCH_DIR)/sys-$(SUBARCH)/user-offsets.s
 
 $(SHARED_HEADERS)/kern_constants.h:
 	$(Q)mkdir -p $(dir $@)
-	$(Q)echo '#include "../../../../include/asm/asm-offsets.h"' >$@
+	$(Q)echo '#include <asm/asm-offsets.h>' >$@
 
 export SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS HEADER_ARCH DEV_NULL_PATH
--
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