linux-kernel - Re: [PATCH] x86: fix unconditional arch/x86/kernel/pcspeaker.c compiling

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Date:	Thu, 17 Jan 2008 10:36:14 -0600
From:	Matt Mackall <mpm@...enic.com>
To:	Michael Opdenacker <michael-lists@...e-electrons.com>
Cc:	linux-kernel@...r.kernel.org, Linux-tiny@...enic.com,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] x86: fix unconditional arch/x86/kernel/pcspeaker.c
	compiling


On Thu, 2008-01-17 at 16:43 +0100, Michael Opdenacker wrote:
> [PATCH] x86: fix unconditional arch/x86/kernel/pcspeaker.c compiling
> 
> Applies to 2.6.24-rc8-git1
> 
> This patch results from Linux Tiny's efforts to hunt for unnecessary
> code added unconditionally with "obj-y +="
> 
> This patch make the compilation of arch/x86/kernel/pcspeaker.c
> depend on PC speaker support. Before that, this file was always
> compiled even if pc speaker support wasn't enabled.
> 
> I'm checking that CONFIG_INPUT_PCSPKR is not set to "m",
> as arch/x86/kernel/pcspeaker.c shouldn't be compiled as a module:
> - It defines no init and exit functions
> - It defines an initcall which only makes sense at
>   kernel boot time.
> 
> Results: if PC speaker support is disabled
> - It reduces the uncompressed kernel size by 218 bytes!!! ;)
> - It must also bring a tiny reduction in boot time
>   but suppressing a useless initcall.
> 
> Your comments?
> 
> ---
> Signed-off-by: Michael Opdenacker <michael@...e-electrons.com>
> 
> diff -Naur linux-2.6.24-rc8-git1/arch/x86/kernel/Makefile_32 linux-2.6.24-rc8-git1-nopcspeaker/arch/x86/kernel/Makefile_32
> --- linux-2.6.24-rc8-git1/arch/x86/kernel/Makefile_32	2008-01-17 09:48:58.000000000 +0100
> +++ linux-2.6.24-rc8-git1-nopcspeaker/arch/x86/kernel/Makefile_32	2008-01-17 10:06:56.000000000 +0100
> @@ -45,10 +45,13 @@
>  
>  obj-$(CONFIG_VMI)		+= vmi_32.o vmiclock_32.o
>  obj-$(CONFIG_PARAVIRT)		+= paravirt_32.o
> -obj-y				+= pcspeaker.o
> -
>  obj-$(CONFIG_SCx200)		+= scx200_32.o
>  
> +ifeq ($(CONFIG_INPUT_PCSPKR),y)
> +	obj-y			+= pcspeaker.o
> +endif

I'm not sure this does what you want. What if CONFIG_INPUT_PCSPKR = m?

You ought to cc: this to Ingo (added). I'm pretty sure these Makefiles
have been unified in x86.git already.

-- 
Mathematics is the supreme nostalgia of our time.

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