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perf symbols: Kill dso__build_id_is_kmod() 

The commit e7ee404757 ("perf symbols: Fix symbols searching for module
in buildid-cache") added the function to check kernel modules reside in
the build-id cache.  This was because there's no way to identify a DSO
which is actually a kernel module.  So it searched linkname of the file
and find ".ko" suffix.

But this does not work for compressed kernel modules and now such DSOs
hCcave correct symtab_type now.  So no need to check it anymore.  This
patch essentially reverts the commit.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Wang Nan <wangnan0@huawei.com>
Cc: kernel-team@lge.com
Link: http://lkml.kernel.org/r/20170608073109.30699-10-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
zero-colors
Namhyung Kim 2017-06-08 16:31:09 +09:00 committed by Arnaldo Carvalho de Melo
parent c25ec42f84
commit b89fe63fba
3 changed files with 0 additions and 50 deletions
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45
tools/perf/util/build-id.c
View File

@ -278,51 +278,6 @@ char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size)
return bf;
}
bool dso__build_id_is_kmod(const struct dso *dso, char *bf, size_t size)
{
char *id_name = NULL, *ch;
struct stat sb;
char sbuild_id[SBUILD_ID_SIZE];
if (!dso->has_build_id)
goto err;
build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
id_name = build_id_cache__linkname(sbuild_id, NULL, 0);
if (!id_name)
goto err;
if (access(id_name, F_OK))
goto err;
if (lstat(id_name, &sb) == -1)
goto err;
if ((size_t)sb.st_size > size - 1)
goto err;
if (readlink(id_name, bf, size - 1) < 0)
goto err;
bf[sb.st_size] = '\0';
/*
* link should be:
* ../../lib/modules/4.4.0-rc4/kernel/net/ipv4/netfilter/nf_nat_ipv4.ko/a09fe3eb3147dafa4e3b31dbd6257e4d696bdc92
*/
ch = strrchr(bf, '/');
if (!ch)
goto err;
if (ch - 3 < bf)
goto err;
free(id_name);
return strncmp(".ko", ch - 3, 3) == 0;
err:
pr_err("Invalid build id: %s\n", id_name ? :
dso->long_name ? :
dso->short_name ? :
"[unknown]");
free(id_name);
return false;
}
#define dsos__for_each_with_build_id(pos, head) \
list_for_each_entry(pos, head, node) \
if (!pos->has_build_id) \

1
tools/perf/util/build-id.h
View File

@ -17,7 +17,6 @@ char *build_id_cache__kallsyms_path(const char *sbuild_id, char *bf,
size_t size);
char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size);
bool dso__build_id_is_kmod(const struct dso *dso, char *bf, size_t size);
int build_id__mark_dso_hit(struct perf_tool *tool, union perf_event *event,
struct perf_sample *sample, struct perf_evsel *evsel,

4
tools/perf/util/symbol.c
View File

@ -1562,10 +1562,6 @@ int dso__load(struct dso *dso, struct map *map)
if (!runtime_ss && syms_ss)
runtime_ss = syms_ss;
if (syms_ss && syms_ss->type == DSO_BINARY_TYPE__BUILD_ID_CACHE)
if (dso__build_id_is_kmod(dso, name, PATH_MAX))
kmod = true;
if (syms_ss)
ret = dso__load_sym(dso, map, syms_ss, runtime_ss, kmod);
else