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perf tools: Update copy of libbpf's hashmap.c

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To pick the changes in:

  85367030a6 ("libbpf: Centralize poisoning and poison reallocarray()")
  7d9c71e10b ("libbpf: Extract generic string hashing function for reuse")

That don't entail any changes in tools/perf.

This addresses this perf build warning:

  Warning: Kernel ABI header at 'tools/perf/util/hashmap.h' differs from latest version at 'tools/lib/bpf/hashmap.h'
  diff -u tools/perf/util/hashmap.h tools/lib/bpf/hashmap.h

Not a kernel ABI, its just that this uses the mechanism in place for
checking kernel ABI files drift.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Andrii Nakryiko <andriin@fb.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2020-10-19 12:26:45 -03:00
parent b773ea6505
commit e555b4b8d7
2 changed files with 15 additions and 0 deletions
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3
tools/perf/util/hashmap.c
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@ -15,6 +15,9 @@
/* make sure libbpf doesn't use kernel-only integer typedefs */
#pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s64
/* prevent accidental re-addition of reallocarray() */
#pragma GCC poison reallocarray
/* start with 4 buckets */
#define HASHMAP_MIN_CAP_BITS 2

12
tools/perf/util/hashmap.h
View File

@ -25,6 +25,18 @@ static inline size_t hash_bits(size_t h, int bits)
#endif
}
/* generic C-string hashing function */
static inline size_t str_hash(const char *s)
{
size_t h = 0;
while (*s) {
h = h * 31 + *s;
s++;
}
return h;
}
typedef size_t (*hashmap_hash_fn)(const void *key, void *ctx);
typedef bool (*hashmap_equal_fn)(const void *key1, const void *key2, void *ctx);