From 1c1a3a4729aae712c55e001e151ef008d030d4a7 Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Tue, 12 Jul 2016 12:19:09 -0300 Subject: [PATCH] perf tools: Add feature detection for gelf_getnote() 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 Cc: Ananth N Mavinakayanahalli Cc: Brendan Gregg Cc: David Ahern Cc: Hemant Kumar Cc: Jiri Olsa Cc: Masami Hiramatsu Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Wang Nan Link: http://lkml.kernel.org/n/tip-82lh22ybedy9b9lych8xj12g@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/build/Makefile.feature | 1 + tools/build/feature/Makefile | 4 ++++ tools/build/feature/test-all.c | 5 +++++ tools/build/feature/test-libelf-gelf_getnote.c | 7 +++++++ tools/perf/config/Makefile | 6 ++++++ tools/perf/util/build-id.c | 2 +- tools/perf/util/probe-file.c | 2 ++ tools/perf/util/symbol-elf.c | 2 ++ 8 files changed, 28 insertions(+), 1 deletion(-) create mode 100644 tools/build/feature/test-libelf-gelf_getnote.c diff --git a/tools/build/Makefile.feature b/tools/build/Makefile.feature index 3dd529bb0604..fe12bee57418 100644 --- a/tools/build/Makefile.feature +++ b/tools/build/Makefile.feature @@ -40,6 +40,7 @@ FEATURE_TESTS_BASIC := \ libbfd \ libelf \ libelf-getphdrnum \ + libelf-gelf_getnote \ libelf-getshdrstrndx \ libelf-mmap \ libnuma \ diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile index 674711629ef0..d6017c1abdb0 100644 --- a/tools/build/feature/Makefile +++ b/tools/build/feature/Makefile @@ -17,6 +17,7 @@ FILES= \ test-cplus-demangle.bin \ test-libelf.bin \ test-libelf-getphdrnum.bin \ + test-libelf-gelf_getnote.bin \ test-libelf-getshdrstrndx.bin \ test-libelf-mmap.bin \ test-libnuma.bin \ @@ -99,6 +100,9 @@ $(OUTPUT)test-libelf-mmap.bin: $(OUTPUT)test-libelf-getphdrnum.bin: $(BUILD) -lelf +$(OUTPUT)test-libelf-gelf_getnote.bin: + $(BUILD) -lelf + $(OUTPUT)test-libelf-getshdrstrndx.bin: $(BUILD) -lelf diff --git a/tools/build/feature/test-all.c b/tools/build/feature/test-all.c index 7433cca33306..843aed024a3a 100644 --- a/tools/build/feature/test-all.c +++ b/tools/build/feature/test-all.c @@ -49,6 +49,10 @@ # include "test-libelf-getphdrnum.c" #undef main +#define main main_test_libelf_gelf_getnote +# include "test-libelf-gelf_getnote.c" +#undef main + #define main main_test_libelf_getshdrstrndx # include "test-libelf-getshdrstrndx.c" #undef main @@ -153,6 +157,7 @@ int main(int argc, char *argv[]) main_test_dwarf(); main_test_dwarf_getlocations(); main_test_libelf_getphdrnum(); + main_test_libelf_gelf_getnote(); main_test_libelf_getshdrstrndx(); main_test_libunwind(); main_test_libaudit(); diff --git a/tools/build/feature/test-libelf-gelf_getnote.c b/tools/build/feature/test-libelf-gelf_getnote.c new file mode 100644 index 000000000000..d78cf4d5271f --- /dev/null +++ b/tools/build/feature/test-libelf-gelf_getnote.c @@ -0,0 +1,7 @@ +#include +#include + +int main(void) +{ + return gelf_getnote(NULL, 0, NULL, NULL, NULL); +} diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile index 97d47140a637..5ac428060779 100644 --- a/tools/perf/config/Makefile +++ b/tools/perf/config/Makefile @@ -309,6 +309,12 @@ ifndef NO_LIBELF CFLAGS += -DHAVE_ELF_GETPHDRNUM_SUPPORT endif + ifeq ($(feature-libelf-gelf_getnote), 1) + CFLAGS += -DHAVE_GELF_GETNOTE_SUPPORT + else + msg := $(warning gelf_getnote() not found on libelf, SDT support disabled); + endif + ifeq ($(feature-libelf-getshdrstrndx), 1) CFLAGS += -DHAVE_ELF_GETSHDRSTRNDX_SUPPORT endif diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c index e1a16408da9c..1e504e40dac8 100644 --- a/tools/perf/util/build-id.c +++ b/tools/perf/util/build-id.c @@ -533,7 +533,7 @@ int build_id_cache__list_build_ids(const char *pathname, return ret; } -#ifdef HAVE_LIBELF_SUPPORT +#if defined(HAVE_LIBELF_SUPPORT) && defined(HAVE_GELF_GETNOTE_SUPPORT) static int build_id_cache__add_sdt_cache(const char *sbuild_id, const char *realname) { diff --git a/tools/perf/util/probe-file.c b/tools/perf/util/probe-file.c index 98398b55a03f..e705a742ee1e 100644 --- a/tools/perf/util/probe-file.c +++ b/tools/perf/util/probe-file.c @@ -624,6 +624,7 @@ int probe_cache__add_entry(struct probe_cache *pcache, return ret; } +#ifdef HAVE_GELF_GETNOTE_SUPPORT static unsigned long long sdt_note__get_addr(struct sdt_note *note) { return note->bit32 ? (unsigned long long)note->addr.a32[0] @@ -682,6 +683,7 @@ int probe_cache__scan_sdt(struct probe_cache *pcache, const char *pathname) cleanup_sdt_note_list(&sdtlist); return ret; } +#endif static int probe_cache_entry__write(struct probe_cache_entry *entry, int fd) { diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c index 79a6a190f41d..cebf98ec27bc 100644 --- a/tools/perf/util/symbol-elf.c +++ b/tools/perf/util/symbol-elf.c @@ -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) { -- GitLab