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[34.168.217.79]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-82379b49fecsm16438559b3a.15.2026.02.02.15.33.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 02 Feb 2026 15:33:25 -0800 (PST) Date: Mon, 2 Feb 2026 23:33:21 +0000 From: David Matlack To: Ted Logan Cc: Alex Williamson , Shuah Khan , kvm@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, kernel test robot Subject: Re: [PATCH] vfio: selftests: only build tests on arm64 and x86_64 Message-ID: References: <20260130-vfio-selftest-only-64bit-v1-1-d89ac0944c01@fb.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260130-vfio-selftest-only-64bit-v1-1-d89ac0944c01@fb.com> On 2026-01-30 04:02 PM, Ted Logan wrote: > Only build vfio self-tests on arm64 and x86_64; these are the only > architectures where the vfio self-tests are run. Addresses compiler > warnings for format and conversions on i386. > > Reported-by: kernel test robot > Closes: https://lore.kernel.org/oe-kbuild-all/202601211830.aBEjmEFD-lkp@intel.com/ > Signed-off-by: Ted Logan > --- > Do not build vfio self-tests for 32-bit architectures, where they're > untested and unmaintained. Only build these tests for arm64 and x86_64, > where they're regularly tested. > > Compiler warning fixed by patch: > > In file included from tools/testing/selftests/vfio/lib/include/libvfio.h:6: > tools/testing/selftests/vfio/lib/include/libvfio/iommu.h:49:2: warning: format specifies type 'unsigned long' but the argument has type 'u64' (aka 'unsigned long long') [-Wformat] > 49 | VFIO_ASSERT_EQ(__iommu_unmap(iommu, region, NULL), 0); > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > tools/testing/selftests/vfio/lib/include/libvfio/assert.h:32:37: note: expanded from macro 'VFIO_ASSERT_EQ' > 32 | #define VFIO_ASSERT_EQ(_a, _b, ...) VFIO_ASSERT_OP(_a, _b, ==, ##__VA_ARGS__) > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > tools/testing/selftests/vfio/lib/include/libvfio/assert.h:27:22: note: expanded from macro 'VFIO_ASSERT_OP' > 26 | fprintf(stderr, " Observed: %#lx %s %#lx\n", \ > | ~~~~ > 27 | (u64)__lhs, #_op, (u64)__rhs); \ > | ^~~~~~~~~~ > --- > tools/testing/selftests/vfio/Makefile | 8 ++++++++ > 1 file changed, 8 insertions(+) > > diff --git a/tools/testing/selftests/vfio/Makefile b/tools/testing/selftests/vfio/Makefile > index ead27892ab65..eeb63ea2b4da 100644 > --- a/tools/testing/selftests/vfio/Makefile > +++ b/tools/testing/selftests/vfio/Makefile > @@ -1,3 +1,10 @@ > +ARCH ?= $(shell uname -m 2>/dev/null || echo not) What's the reason for the stderr redirection and "echo not"? > + > +ifeq (,$(filter $(ARCH),arm64 x86_64)) > +nothing: > +.PHONY: all clean run_tests install > +.SILENT: I think you can just add the following line so that this is a valid empty selftest Makefile on unsupported architectures, without having to define all those targets: include ../lib.mk Also I would recommend spacing things out a little so that the unsupported architecture handling is more "off to the side". e.g. diff --git a/tools/testing/selftests/vfio/Makefile b/tools/testing/selftests/vfio/Makefile index ead27892ab65..9386f75b590d 100644 --- a/tools/testing/selftests/vfio/Makefile +++ b/tools/testing/selftests/vfio/Makefile @@ -1,3 +1,10 @@ +ARCH ?= $(shell uname -m) + +ifeq (,$(filter $(ARCH),arm64 x86_64)) +# Do nothing on unsupported architectures. +include ../lib.mk +else + CFLAGS = $(KHDR_INCLUDES) TEST_GEN_PROGS += vfio_dma_mapping_test TEST_GEN_PROGS += vfio_dma_mapping_mmio_test @@ -28,3 +35,5 @@ TEST_DEP_FILES = $(patsubst %.o, %.d, $(TEST_GEN_PROGS_O) $(LIBVFIO_O)) -include $(TEST_DEP_FILES) EXTRA_CLEAN += $(TEST_GEN_PROGS_O) $(TEST_DEP_FILES) + +endif > +else > CFLAGS = $(KHDR_INCLUDES) > TEST_GEN_PROGS += vfio_dma_mapping_test > TEST_GEN_PROGS += vfio_dma_mapping_mmio_test > @@ -28,3 +35,4 @@ TEST_DEP_FILES = $(patsubst %.o, %.d, $(TEST_GEN_PROGS_O) $(LIBVFIO_O)) > -include $(TEST_DEP_FILES) > > EXTRA_CLEAN += $(TEST_GEN_PROGS_O) $(TEST_DEP_FILES) > +endif > > --- > base-commit: c3cbc276c2a33b04fc78a86cdb2ddce094cb3614 > change-id: 20260130-vfio-selftest-only-64bit-422518bdeba7 > > Best regards, > -- > Ted Logan >