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From: WANG Chao <chaowang@redhat.com>
To: Vivek Goyal <vgoyal@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>,
	"maintainer:X86 ARCHITECTURE..." <x86@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Baoquan He <bhe@redhat.com>,
	Stephen Rothwell <sfr@canb.auug.org.au>,
	"open list:X86 ARCHITECTURE..." <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] arch/x86/purgatory/Makefile: supress kexec-purgatory.c is up to date message
Date: Wed, 15 Oct 2014 10:14:31 +0800	[thread overview]
Message-ID: <20141015021431.GE2013@dhcp-17-37.nay.redhat.com> (raw)
In-Reply-To: <20141014215253.GM5127@redhat.com>

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@redhat.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

  reply	other threads:[~2014-10-15  2:14 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-10-14  4:46 WANG Chao
2014-10-14 20:44 ` Peter Foley
2014-10-14 21:52 ` Vivek Goyal
2014-10-15  2:14   ` WANG Chao [this message]
2014-10-15 13:06     ` Vivek Goyal
2014-10-15 15:33 ` [tip:x86/build] x86/purgatory, build: Suppress " tip-bot for WANG Chao

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