lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Sat, 15 Mar 2008 05:28:24 +0100 (CET)
From:	Roman Zippel <zippel@...ux-m68k.org>
To:	john stultz <johnstul@...ibm.com>
cc:	lkml <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH 1/5] split clocksource adjustment from clockosurce mult

Hi,

On Fri, 14 Mar 2008, john stultz wrote:

> @@ -179,7 +181,7 @@ static inline cycle_t clocksource_read(struct clocksource *cs)
>  static inline s64 cyc2ns(struct clocksource *cs, cycle_t cycles)
>  {
>  	u64 ret = (u64)cycles;
> -	ret = (ret * cs->mult) >> cs->shift;
> +	ret = (ret * (cs->mult + cs->mult_adj)) >> cs->shift;
>  	return ret;
>  }

This add an extra memory access and extra instruction to a code path, we 
should keep as short as possible.
I'd rather add a mult_raw or mult_org and use that for your next patch.

bye, Roman
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists