On Mon, 19 Jun 2023 at 12:15, Dmitry Vyukov <dvyukov@xxxxxxxxxx> wrote: > On Mon, 19 Jun 2023 at 12:12, Chanho Min <chanho.min@xxxxxxx> wrote: > > > > This patch removes description of the KASAN_HW_TAGS's memory consumption. > > KASAN_HW_TAGS does not set 1/32nd shadow memory. > > The hardware still allocates/uses shadow in MTE. > Though, it may be 1/16-th, not sure. I think the point is that it depends on the hardware implementation of MTE. There are a range of possibilities, but enabling KASAN_HW_TAGS doesn't consume any extra memory for tags itself if the hardware has to enable MTE and provision tag space via firmware to begin with. > > Signed-off-by: Chanho Min <chanho.min@xxxxxxx> I think you just have to be a bit clearer in the commit description, just briefly mentioning how/where the tag space is allocated in hardware that do support MTE. Then removing this line is probably fair, if KASAN_HW_TAGS isn't the direct reason for tag memory being allocated.
