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Date:	Tue, 14 Oct 2014 17:52:53 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	WANG Chao <chaowang@...hat.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"maintainer:X86 ARCHITECTURE..." <x86@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Baoquan He <bhe@...hat.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	"open list:X86 ARCHITECTURE..." <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arch/x86/purgatory/Makefile: supress kexec-purgatory.c
 is up to date message

On Tue, Oct 14, 2014 at 12:46:58PM +0800, WANG Chao wrote:
> Supress this unnecessary message during kernel re-build
> (CONFIG_KEXEC_FILE=y):
> 
> make[1]: `arch/x86/purgatory/kexec-purgatory.c' is up to date.
> 
> Signed-off-by: WANG Chao <chaowang@...hat.com>
> ---
>  arch/x86/purgatory/Makefile | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/x86/purgatory/Makefile b/arch/x86/purgatory/Makefile
> index f52e033..2c835e3 100644
> --- a/arch/x86/purgatory/Makefile
> +++ b/arch/x86/purgatory/Makefile
> @@ -24,6 +24,7 @@ quiet_cmd_bin2c = BIN2C   $@
>  
>  $(obj)/kexec-purgatory.c: $(obj)/purgatory.ro FORCE
>  	$(call if_changed,bin2c)
> +	@:

Where can I find the description of "@:" and how does it work?

Thanks
Vivek
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