linux-kernel - Re: [PATCH, -tip] Make hierarchical RCU be the default

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, 27 Dec 2008 11:35:01 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, tglx@...utronix.de,
	akpm@...ux-foundation.org, ralf@...ux-mips.org,
	kernel@...tstofly.org, hskinnemoen@...el.com, cooloney@...nel.org,
	tony.luck@...el.com, geert@...ux-m68k.org, zippel@...ux-m68k.org,
	jwboyer@...ux.vnet.ibm.com, mporter@...nel.crashing.org,
	grant.likely@...retlab.ca, paulus@...ba.org,
	benh@...nel.crashing.org, dhowells@...hat.com,
	yasutake.koichi@...panasonic.com, lethal@...ux-sh.org,
	hpa@...or.com
Subject: Re: [PATCH, -tip] Make hierarchical RCU be the default


* Paul E. McKenney <paulmck@...ux.vnet.ibm.com> wrote:

> --- a/include/linux/hardirq.h
> +++ b/include/linux/hardirq.h
> @@ -118,7 +118,7 @@ static inline void account_system_vtime(struct task_struct *tsk)
>  }
>  #endif
>  
> -#if defined(CONFIG_NO_HZ) && !defined(CONFIG_CLASSIC_RCU)
> +#if defined(CONFIG_NO_HZ) && !defined(CONFIG_FLAT_RCU)

this can be done in an even lazier fashion, via a ~5 lines patch.

Just add FLAT_RCU as the new kconfig method, and make CONFIG_CLASSIC_RCU 
mirror it via something like:

  config CLASSIC_RCU
  bool
  default FLAT_RCU

that makes your patch only affect the Kconfig file - and makes it easily 
revertable, etc.

	Ingo
--
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/