Re: [PATCH v9 1/4] arm64: mte: implement CONFIG_ARM64_MTE_COMP

[Catalin Marinas]

On Mon, Nov 13, 2023 at 11:52:30AM +0100, Alexander Potapenko wrote:
> The config implements the algorithm compressing memory tags for ARM MTE
> during swapping.
> 
> The algorithm is based on RLE and specifically targets buffers of tags
> corresponding to a single page. In many cases a buffer can be compressed
> into 63 bits, making it possible to store it without additional memory
> allocation.
> 
> Suggested-by: Evgenii Stepanov <eugenis@xxxxxxxxxx>
> Signed-off-by: Alexander Potapenko <glider@xxxxxxxxxx>

Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx>

> +void mte_tags_to_ranges(u8 *tags, u8 *out_tags, unsigned short *out_sizes,
> +			size_t *out_len)
> +{
[...]
> +}
> +EXPORT_SYMBOL_NS(mte_tags_to_ranges, MTECOMP);

I may have asked before, what the reason for EXPORT_SYMBOL_NS? Is it for
the kunit tests? Otherwise we don't expect those to be accessed from
modules.

-- 
Catalin