kasan: speed up mte_set_mem_tag_range
Use DC GVA / DC GZVA to speed up KASan memory tagging in HW tags mode. The first cacheline is always tagged using STG/STZG even if the address is cacheline-aligned, as benchmarks show it is faster than a conditional branch. Signed-off-by: Evgenii Stepanov <eugenis@google.com> Co-developed-by: Peter Collingbourne <pcc@google.com> Signed-off-by: Peter Collingbourne <pcc@google.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Link: https://lore.kernel.org/r/20210521010023.3244784-1-eugenis@google.com Signed-off-by: Will Deacon <will@kernel.org>
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