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Subject[PATCH 2/9] perf arch: Make the default get_cpuid() return compatible error
From: Arnaldo Carvalho de Melo <>

Some of the functions calling get_cpuid() propagate back the error it
returns, and all are using errno (positive) values, make the weak
default get_cpuid() function return ENOSYS to be consistent and to allow
checking if this is an arch not providing this function or if a provided
one is having trouble getting the cpuid, to decide if the warning should
be provided to the user or just a debug message should be emitted.

Reviewed-by: Mark Rutland <>
Tested-by: Mark Rutland <>
Tested-by: John Garry <> # arm64
Acked-by: Jiri Olsa <>
Cc: Adrian Hunter <>
Cc: Namhyung Kim <>
Cc: Will Deacon <>
Signed-off-by: Arnaldo Carvalho de Melo <>
tools/perf/util/header.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index becc2d109423..4d39a75551a0 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -850,7 +850,7 @@ int __weak strcmp_cpuid_str(const char *mapcpuid, const char *cpuid)
int __weak get_cpuid(char *buffer __maybe_unused, size_t sz __maybe_unused)
- return -1;
+ return ENOSYS; /* Not implemented */

static int write_cpuid(struct feat_fd *ff,
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