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perf tools: Add feature detection for gelf_getnote()

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That is not present on some libelf implementations, such as the one used
in Alpine Linux: libelf-0.8.13.

This ends up disabling the SDT code, that relies on this function.

One alternative would be to provide an weak fallback implementation or
the open coded variant used by the buildid sysfs notes reading code.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Hemant Kumar <hemant@linux.vnet.ibm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-82lh22ybedy9b9lych8xj12g@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2016-07-12 12:19:09 -03:00
parent c8a3f7de76
commit 1c1a3a4729
8 changed files with 28 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

2
tools/perf/util/symbol-elf.c
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@ -1790,6 +1790,7 @@ void kcore_extract__delete(struct kcore_extract *kce)
unlink(kce->extract_filename);
}
#ifdef HAVE_GELF_GETNOTE_SUPPORT
/**
* populate_sdt_note : Parse raw data and identify SDT note
* @elf: elf of the opened file
@ -2041,6 +2042,7 @@ int sdt_notes__get_count(struct list_head *start)
count++;
return count;
}
#endif
void symbol__elf_init(void)
{