@@ -53,6 +53,21 @@
#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
#endif
+/*
+ * gcc cpuid.h provides __cpuid_count() since v4.4.
+ * Clang/LLVM cpuid.h provides __cpuid_count() since v3.4.0.
+ *
+ * Provide local define for tests needing __cpuid_count() because
+ * selftests need to work in older environments that do not yet
+ * have __cpuid_count().
+ */
+#ifndef __cpuid_count
+#define __cpuid_count(level, count, a, b, c, d) \
+ __asm__ __volatile__ ("cpuid\n\t" \
+ : "=a" (a), "=b" (b), "=c" (c), "=d" (d) \
+ : "0" (level), "2" (count))
+#endif
+
/* define kselftest exit codes */
#define KSFT_PASS 0
#define KSFT_FAIL 1
Some selftests depend on information provided by the CPUID instruction. To support this dependency the selftests implement private wrappers for CPUID. Duplication of the CPUID wrappers should be avoided. Both gcc and clang/LLVM provide __cpuid_count() macros but neither the macro nor its header file are available in all the compiler versions that need to be supported by the selftests. __cpuid_count() as provided by gcc is available starting with gcc v4.4, so it is not available if the latest tests need to be run in all the environments required to support kernels v4.9 and v4.14 that have the minimal required gcc v3.2. Duplicate gcc's __cpuid_count() macro to provide a centrally defined macro for __cpuid_count() to help eliminate the duplicate CPUID wrappers while continuing to compile in older environments. Suggested-by: Shuah Khan <skhan@linuxfoundation.org> Signed-off-by: Reinette Chatre <reinette.chatre@intel.com> --- Note to maintainers: - Macro is identical to the one provided by gcc, but not liked by checkpatch.pl with message "Macros with complex values should be enclosed in parentheses". Similar style is used in kernel, for example in arch/x86/kernel/fpu/xstate.h. Changes since V2: - Highlight in changelog that macro is copied from gcc. tools/testing/selftests/kselftest.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+)