[PATCH v11 5/5] Documentation: document the preferred tag checking mode feature

[Catalin Marinas]

On Wed, Jul 28, 2021 at 08:11:00AM +0200, Greg Kroah-Hartman wrote:
> On Tue, Jul 27, 2021 at 01:52:59PM -0700, Peter Collingbourne wrote:
> > diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu
> > index 160b10c029c0..5f87b146deb9 100644
> > --- a/Documentation/ABI/testing/sysfs-devices-system-cpu
> > +++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
> > @@ -640,3 +640,21 @@ Description:	SPURR ticks for cpuX when it was idle.
> >  
> >  		This sysfs interface exposes the number of SPURR ticks
> >  		for cpuX when it was idle.
> > +
> > +What: 		/sys/devices/system/cpu/cpuX/mte_tcf_preferred
> > +Date:		July 2021
> > +Contact:	Linux ARM Kernel Mailing list <linux-arm-kernel at lists.infradead.org>
> > +Description:	Preferred MTE tag checking mode
> > +
> > +		When a user program specifies more than one MTE tag checking
> > +		mode, this sysfs node is used to specify which mode should
> > +		be preferred when running on that CPU. Possible values:
> > +
> > +		================  ==============================================
> > +		"sync"	  	  Prefer synchronous mode
> > +		"async"	  	  Prefer asynchronous mode
> > +		================  ==============================================
> > +
> > +		Changes to this sysfs node may not take effect immediately.
> 
> Ok, so when do they take effect?  A hint would be nice :)

I'll go with Will suggestion below and remove this line altogether (it
takes effect when scheduling a task on a CPU):

https://lore.kernel.org/r/20210714115018.GE31686@willie-the-truck

-- 
Catalin