linux-kernel - Re: [pp] kbuild: asm-offsets generalized

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Date:	Fri, 16 Feb 2007 19:56:35 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Oleg Verych <olecom@...wer.upol.cz>
Cc:	LKML <linux-kernel@...r.kernel.org>, Andi Kleen <ak@....de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [pp] kbuild: asm-offsets generalized

On Fri, Feb 16, 2007 at 04:59:29PM +0100, Oleg Verych wrote:
> > > 
> > > Proposition will follow.
> > > 
> > []
> > 
> > [patch proposition] kbuild: lguest with private asm-offsets
> [] 
> >  * needs "asm-offsets magic demystified, generalized".
> [] 

To make asm-offset generic I had in mind something like the
following.
It uses the currect functionality, and allows for architecture override
as needed - but default not used. And architecture override is kept in a
architecture specific location.

	Sam

commit df95bb04b04ff2f64805dfa8459099ffe469c8a5
Author: Sam Ravnborg <sam@...nus.ravnborg.org>
Date:   Fri Feb 16 19:51:29 2007 +0100

    kbuild: Make asm-offset generic
    
    Signed-off-by: Sam Ravnborg <sam@...nborg.org>

diff --git a/include/asm-generic/asm-offset b/include/asm-generic/asm-offset
new file mode 100644
index 0000000..5e5629e
--- /dev/null
+++ b/include/asm-generic/asm-offset
@@ -0,0 +1,30 @@
+#
+# Support generating constant useable from assembler but defined on C-level
+#
+# See usage in top-level Kbuild file
+
+# Default sed regexp - multiline due to syntax constraints
+define sed-y
+	"/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"
+endef
+
+# let architectures override the sed expression as needed
+-include include/asm/asm-offset
+
+quiet_cmd_offsets = GEN     $@
+define cmd_offsets
+	(set -e; \
+	 echo "#ifndef __ASM_OFFSETS_H__"; \
+	 echo "#define __ASM_OFFSETS_H__"; \
+	 echo "/*"; \
+	 echo " * DO NOT MODIFY."; \
+	 echo " *"; \
+	 echo " * This file was generated by Kbuild"; \
+	 echo " *"; \
+	 echo " */"; \
+	 echo ""; \
+	 sed -ne $(sed-y) $<; \
+	 echo ""; \
+	 echo "#endif" ) > $@
+endef
+
diff --git a/include/asm-mips/asm-offset b/include/asm-mips/asm-offset
new file mode 100644
index 0000000..b2eb959
--- /dev/null
+++ b/include/asm-mips/asm-offset
@@ -0,0 +1,4 @@
+# Override default sed for MIPS when generating asm-offset
+sed-$(CONFIG_MIPS) := "/^@@@/{s/^@@@//; s/ \#.*\$$//; p;}"
+
+
diff --git a/Kbuild b/Kbuild
index 0451f69..0a32f5f 100644
--- a/Kbuild
+++ b/Kbuild
@@ -1,5 +1,8 @@
 #
 # Kbuild for top-level directory of the kernel
+
+
+
 # This file takes care of the following:
 # 1) Generate asm-offsets.h
 
@@ -7,36 +10,14 @@ #####
 # 1) Generate asm-offsets.h
 #
 
+include include/asm-generic/asm-offset
+
 offsets-file := include/asm-$(ARCH)/asm-offsets.h
 
 always  := $(offsets-file)
 targets := $(offsets-file)
 targets += arch/$(ARCH)/kernel/asm-offsets.s
 
-# Default sed regexp - multiline due to syntax constraints
-define sed-y
-	"/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"
-endef
-# Override default regexp for specific architectures
-sed-$(CONFIG_MIPS) := "/^@@@/{s/^@@@//; s/ \#.*\$$//; p;}"
-
-quiet_cmd_offsets = GEN     $@
-define cmd_offsets
-	(set -e; \
-	 echo "#ifndef __ASM_OFFSETS_H__"; \
-	 echo "#define __ASM_OFFSETS_H__"; \
-	 echo "/*"; \
-	 echo " * DO NOT MODIFY."; \
-	 echo " *"; \
-	 echo " * This file was generated by Kbuild"; \
-	 echo " *"; \
-	 echo " */"; \
-	 echo ""; \
-	 sed -ne $(sed-y) $<; \
-	 echo ""; \
-	 echo "#endif" ) > $@
-endef
-
 # We use internal kbuild rules to avoid the "is up to date" message from make
 arch/$(ARCH)/kernel/asm-offsets.s: arch/$(ARCH)/kernel/asm-offsets.c FORCE
 	$(Q)mkdir -p $(dir $@)
-
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