linux-kernel - Re: [PATCH] timekeeping: drop irq-context clocksource polling

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]

Message-Id: <1175979019.28263.523.camel@localhost.localdomain>
Date:	Sat, 07 Apr 2007 22:50:19 +0200
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Daniel Walker <dwalker@...sta.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, johnstul@...ibm.com, mingo@...e.hu
Subject: Re: [PATCH] timekeeping: drop irq-context clocksource polling

On Sat, 2007-04-07 at 10:43 -0700, Daniel Walker wrote:
> Looks like this path ,
> 
> arch/i386/kernel/tsc.c: time_cpufreq_notifier(); <-- takes xtime_lock
> 			 mark_tsc_unstable();
>             		  clocksource_change_rating(&clocksource_tsc, 0);
> 			   timekeeping_change_clocksource(); <-- takes xtime_lock
> 
> 
> I'm not sure why the time_cpufreq_notifier is taking the xtime_lock tho .

Simply because it fiddles with variables which are relevant for
timekeeping.

	tglx


	

	

-
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/