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To test address tag[63:60] and memory tag[59:56] is preserved when memory tag fault happen, Let mte_register_signal() to register signal handler with SA_EXPOSE_TAGBITS. Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com> Reviewed-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20250618084513.1761345-6-yeoreum.yun@arm.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>