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

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Date:	Fri, 16 Feb 2007 22:56:17 +0100
From:	Oleg Verych <olecom@...wer.upol.cz>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, Andi Kleen <ak@....de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [pp] kbuild: asm-offsets generalized

Hallo.

On Fri, Feb 16, 2007 at 07:56:35PM +0100, Sam Ravnborg wrote:
> 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.

Then i misunderstood, what you mean, sorry.

> 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 $@)

Thanks.

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