linux-kernel - Re: [PATCH v2 3/5] kbuild/extable: Hook up sortextable into the build system.

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Date:	Fri, 20 Apr 2012 17:02:01 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	David Daney <ddaney.cavm@...il.com>
Cc:	Ralf Baechle <ralf@...ux-mips.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Michal Marek <mmarek@...e.cz>, linux-kernel@...r.kernel.org,
	linux-mips@...ux-mips.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Daney <david.daney@...ium.com>
Subject: Re: [PATCH v2 3/5] kbuild/extable: Hook up sortextable into the
	build system.

On Thu, Apr 19, 2012 at 02:59:57PM -0700, David Daney wrote:
> From: David Daney <david.daney@...ium.com>
> 
> Define a config variable BUILDTIME_EXTABLE_SORT to control build time
> sorting of the kernel's exception table.
> 
> Patch Makefile to do the sorting when BUILDTIME_EXTABLE_SORT is
> selected.
> 
> Signed-off-by: David Daney <david.daney@...ium.com>
> ---
>  Makefile     |   10 ++++++++++
>  init/Kconfig |    3 +++
>  2 files changed, 13 insertions(+), 0 deletions(-)
> 
> diff --git a/Makefile b/Makefile
> index ae947cc..e3bbca9 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -784,6 +784,10 @@ quiet_cmd_vmlinux_version = GEN     .version
>  quiet_cmd_sysmap = SYSMAP
>        cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
>  
> +# Sort exception table at build time
> +quiet_cmd_sortextable = SORTEX
> +      cmd_sortextable = $(objtree)/scripts/sortextable
> +
>  # Link of vmlinux
>  # If CONFIG_KALLSYMS is set .version is already updated
>  # Generate System.map and verify that the content is consistent
> @@ -796,6 +800,12 @@ define rule_vmlinux__
>  	$(call cmd,vmlinux__)
>  	$(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
>  
> +	$(if $(CONFIG_BUILDTIME_EXTABLE_SORT),				\
> +	  $(Q)$(if $($(quiet)cmd_sortextable),				\
> +	    echo '  $($(quiet)cmd_sortextable)  vmlinux' &&)		\
> +	  $(cmd_sortextable)  vmlinux)
> +
> +

Anything that add complexity to the top-level Makefile is bad :-(
I once looked at moving all the final link stuff to a script.
Maybe it is time to open that again...


> +config BUILDTIME_EXTABLE_SORT
> +	bool
> +
Please add a comment about what this symbol is used for.
Also we often name such symbols: HAVE_*

	Sam
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