linux-kernel - Re: [PATCH] arch/x86/purgatory/Makefile: supress kexec-purgatory.c is up to date message

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Date:	Wed, 15 Oct 2014 10:14:31 +0800
From:	WANG Chao <chaowang@...hat.com>
To:	Vivek Goyal <vgoyal@...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 10/14/14 at 05:52pm, Vivek Goyal wrote:
> 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?

@ is used to suppress echo'ing. See:
https://www.gnu.org/software/make/manual/html_node/Echoing.html

This is a trick to avoid "... is up to date" message". Check out commit
a9358bc ("x86/build: Supress realmode.bin is up to date message").

Thanks
WANG Chao
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