On Thu, May 26, 2022 at 03:19:54PM -0300, Arnaldo Carvalho de Melo wrote: [...] > Too old to support? > > 69 7.19 ubuntu:16.04-x-arm64 : FAIL gcc version 5.4.0 20160609 (Ubuntu/Linaro 5.4.0-6ubuntu1~16.04.9) > arch/arm64/util/perf_regs.c: In function 'arch__user_reg_mask': > arch/arm64/util/perf_regs.c:151:28: error: 'HWCAP_SVE' undeclared (first use in this function) > if (getauxval(AT_HWCAP) & HWCAP_SVE) > ^ > arch/arm64/util/perf_regs.c:151:28: note: each undeclared identifier is reported only once for each function it appears in > /git/perf-5.18.0/tools/build/Makefile.build:139: recipe for target 'util' failed > make[5]: *** [util] Error 2 > /git/perf-5.18.0/tools/build/Makefile.build:139: recipe for target 'arm64' failed > make[4]: *** [arm64] Error 2 > /git/perf-5.18.0/tools/build/Makefile.build:139: recipe for target 'arch' failed > make[3]: *** [arch] Error 2 > > > ⬢[acme@toolbox perf]$ find . -name "*.h" | xargs grep -w HWCAP_SVE > ./arch/arm64/include/uapi/asm/hwcap.h:#define HWCAP_SVE (1 << 22) > ⬢[acme@toolbox perf]$ I tested aarch64 GCC-7.4.1 which doesn't support HWCAP_SVE, but aarch64 GCC-8.3.0 and GCC-9.4.0 support it. Either we can add below code: #ifndef HWCAP_SVE #define HWCAP_SVE (1 << 22) #endif Or directly include header file <.../asm/hwcap.h>. Not sure which method is preferred. Maybe the first approach can be de-couple with Linux kernel code? Thanks, Leo
