[PATCH v10 5/5] Documentation: document the preferred tag checking mode feature

[Will Deacon]

On Tue, Jul 13, 2021 at 04:48:01PM -0700, Peter Collingbourne wrote:
> Document the functionality added in the previous patches.
> 
> Link: https://linux-review.googlesource.com/id/I48217cc3e8b8da33abc08cbaddc11cf4360a1b86
> Signed-off-by: Peter Collingbourne <pcc at google.com>
> Reviewed-by: Catalin Marinas <catalin.marinas at arm.com>
> Acked-by: Will Deacon <will at kernel.org>
> ---
> v10:
> - document that setting the sysfs node may not take effect
>   immediately
> - unabbreviate month name
> 
> v9:
> - add documentation for sysfs node under Documentation/ABI
> 
>  .../ABI/testing/sysfs-devices-system-cpu      | 18 +++++++
>  .../arm64/memory-tagging-extension.rst        | 48 ++++++++++++++++---
>  2 files changed, 59 insertions(+), 7 deletions(-)
> 
> diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu
> index fe13baa53c59..6e667338df9f 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:

So I suppose we could replace "running" with "scheduling a task" and then
remove:

> +		Changes to this sysfs node may not take effect immediately.

altogether, as it makes it sounds as though the change might just be
ignored.

But I don't want to bikeshed this, so:

Acked-by: Will Deacon <will at kernel.org>

Will