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Add tests for FEAT_LS64. Issue related instructions if feature presents, no SIGILL should be received. When such instructions operate on Device memory or non-cacheable memory, we may received a SIGBUS during the test (w/o FEAT_LS64WB). Just ignore it since we only tested whether the instruction itself can be issued as expected on platforms declaring the support of such features. Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Oliver Upton <oupton@kernel.org> Signed-off-by: Yicong Yang <yangyicong@hisilicon.com> Signed-off-by: Zhou Wang <wangzhou1@hisilicon.com> Signed-off-by: Will Deacon <will@kernel.org>