linux-kernel - Re: [PATCH v4 4/5] arm64: mte: add a test for MTE tags compression

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Date:   Fri, 22 Sep 2023 10:05:46 +0200
From:   Alexander Potapenko <glider@...gle.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     catalin.marinas@....com, will@...nel.org, pcc@...gle.com,
        andreyknvl@...il.com, linux@...musvillemoes.dk,
        yury.norov@...il.com, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, eugenis@...gle.com,
        syednwaris@...il.com, william.gray@...aro.org
Subject: Re: [PATCH v4 4/5] arm64: mte: add a test for MTE tags compression

On Fri, Jul 21, 2023 at 1:25 PM Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
>
> On Thu, Jul 20, 2023 at 07:39:55PM +0200, Alexander Potapenko wrote:
> > Ensure that tag sequences containing alternating values are compressed
> > to buffers of expected size and correctly decompressed afterwards.
>
> ...
>
> > +#include <linux/bits.h>
> > +#include <linux/module.h>
> > +#include <linux/slab.h>
> > +#include <linux/string.h>
>
> > +#include <kunit/test.h>
>
> Keep this in a separate group outside of linux/*.

Done.

>
> > +#include <linux/types.h>
> > +
> > +#include <asm/mtecomp.h>
>
> ...
>
> > +/* Functions exported from mtecomp.c for this test. */
> > +void mte_tags_to_ranges(u8 *tags, u8 *out_tags, unsigned short *out_sizes,
> > +                     size_t *out_len);
> > +void mte_ranges_to_tags(u8 *r_tags, unsigned short *r_sizes, size_t r_len,
> > +                     u8 *tags);
>
> This is interesting. Have you run `make W=1` on this code?

You are right, this is fishy. I added mtecomp.h and moved the
declarations there instead.