Subject: Re: [PATCH v4 24/39] arm64: mte: Add in-kernel MTE helpers

From: Catalin Marinas <[email-masked]>
Date: Fri, 2 Oct 2020 14:51:00 +0100

On Fri, Oct 02, 2020 at 01:10:25AM +0200, Andrey Konovalov wrote:
> From: Vincenzo Frascino <[email-masked]>
> 
> Provide helper functions to manipulate allocation and pointer tags for
> kernel addresses.
> 
> Low-level helper functions (mte_assign_*, written in assembly) operate
> tag values from the [0x0, 0xF] range. High-level helper functions
> (mte_get/set_*) use the [0xF0, 0xFF] range to preserve compatibility
> with normal kernel pointers that have 0xFF in their top byte.
> 
> MTE_GRANULE_SIZE and related definitions are moved to mte-def.h header
> that doesn't have any dependencies and is safe to include into any
> low-level header.
> 
> Signed-off-by: Vincenzo Frascino <[email-masked]>
> Co-developed-by: Andrey Konovalov <[email-masked]>
> Signed-off-by: Andrey Konovalov <[email-masked]>

Reviewed-by: Catalin Marinas <[email-masked]>

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