[PATCH v5 6/7] kselftest/arm64/mte: preparation for mte store only test

Mark Brown broonie at kernel.org
Wed Jun 11 06:10:40 PDT 2025


On Wed, Jun 11, 2025 at 10:48:01AM +0100, Yeoreum Yun wrote:
> Since ARMv8.9, FEAT_MTE_STORE_ONLY can be used to restrict raise of tag
> check fault on store operation only.
> 
> This patch is preparation for testing FEAT_MTE_STORE_ONLY
> It shouldn't change test result.

Not verified that that's the case but from inspection:

Reviewed-by: Mark Brown <broonie at kernel.org>

> -	mte_switch_mode(mode, MTE_ALLOW_NON_ZERO_TAG);
> +	mte_switch_mode(mode, MTE_ALLOW_NON_ZERO_TAG, false);
>  	item = ARRAY_SIZE(sizes);

I was going to say on the other series that the boolean flags are kind
of awkward from a readability point of view, but equally it doesn't feel
worth it to make these arguments enums so I'll just mention it but it's
fine either way.
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