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    Subject[PATCH] perf arm pmu: fix build error on MUSL libc
    Date
    __always_inline can cause build error on musl libc. The fix patch has
    submitted but not merged yet[1]. To build perf tool with musl libc,
    <linux/stddef.h> inclusion is necessary and it should be included before
    perf_event.h.

    from /usr/include/linux/byteorder/little_endian.h:13,
    from /usr/include/asm/byteorder.h:23,
    from tools/include/uapi/linux/perf_event.h:20,
    from arch/arm64/util/../../arm/util/pmu.c:9:

    /usr/include/linux/swab.h:171:8: error: unknown type name '__always_inline'
    171 | static __always_inline __u16 __swab16p(const __u16 *p)
    | ^~~~~~~~~~~~~~~

    [1]: https://lkml.org/lkml/2018/9/13/78
    Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
    Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
    Cc: Mike Leach <mike.leach@linaro.org>
    Cc: Leo Yan <leo.yan@linaro.org>
    Cc: John Garry <john.garry@huawei.com>
    Cc: Will Deacon <will@kernel.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
    Cc: Mark Rutland <mark.rutland@arm.com>
    Cc: Jiri Olsa <jolsa@redhat.com>
    Cc: Namhyung Kim <namhyung@kernel.org>
    Cc: Khem Raj <raj.khem@gmail.com>
    Signed-off-by: Chanho Park <chanho61.park@samsung.com>
    ---
    tools/perf/arch/arm/util/pmu.c | 3 +++
    1 file changed, 3 insertions(+)

    diff --git a/tools/perf/arch/arm/util/pmu.c b/tools/perf/arch/arm/util/pmu.c
    index bbc297a7e2e3..4c0357e8c0ab 100644
    --- a/tools/perf/arch/arm/util/pmu.c
    +++ b/tools/perf/arch/arm/util/pmu.c
    @@ -6,6 +6,9 @@

    #include <string.h>
    #include <linux/coresight-pmu.h>
    +#if !defined(__GLIBC__)
    +#include <linux/stddef.h>
    +#endif
    #include <linux/perf_event.h>
    #include <linux/string.h>

    --
    2.23.0
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