linux-kernel - Re: [PATCH] Avoid overflows in kernel/time.c (version 4)

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Message-ID: <20071218053729.GA13238@uranus.ravnborg.org>
Date:	Tue, 18 Dec 2007 06:37:29 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Arch Mailing List <linux-arch@...r.kernel.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	Richard Henderson <rth@...ddle.net>,
	Michael Starvik <starvik@...s.com>,
	David Howells <dhowells@...hat.com>,
	Yoshinori Sato <ysato@...rs.sourceforge.jp>,
	Hirokazu Takata <takata@...ux-m32r.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Roman Zippel <zippel@...ux-m68k.org>,
	"William L. Irwin" <sparclinux@...r.kernel.org>,
	Chris Zankel <chris@...kel.net>,
	Jan Engelhardt <jengelh@...putergmbh.de>
Subject: Re: [PATCH] Avoid overflows in kernel/time.c (version 4)

> diff --git a/kernel/Makefile b/kernel/Makefile
> index dfa9695..749825a 100644
> --- a/kernel/Makefile
> +++ b/kernel/Makefile
> @@ -80,3 +80,11 @@ quiet_cmd_ikconfiggz = IKCFG   $@
>  targets += config_data.h
>  $(obj)/config_data.h: $(obj)/config_data.gz FORCE
>  	$(call if_changed,ikconfiggz)
> +
> +$(obj)/time.o: $(obj)/timeconst.h
> +
> +quiet_cmd_timeconst  = TIMEC   $@
> +      cmd_timeconst  = $(PERL) $< $(CONFIG_HZ) > $@
> +targets += timeconst.h
> +$(obj)/timeconst.h: $(src)/timeconst.pl $(wildcard include/config/hz.h) FORCE
> +	$(call if_changed,timeconst)

The prerequisite $(wildcard include/config/hz.h) is not needed.
You will run the perl script if:
- timeconst.h is missing
- if commandline changes (new CONFIG_HZ value)

Otherwise it looks OK to me.

	Sam
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