commit 10705b2b7a8e4eb46ab5bf1b9ee354cb9a929428 upstream.
Adding load_kallsyms_refresh function to re-read symbols from /proc/kallsyms file.
This will be needed to get proper functions addresses from bpf_testmod.ko module, which is loaded/unloaded several times during the tests run, so symbols might be already old when we need to use them.
Acked-by: Song Liu song@kernel.org Signed-off-by: Jiri Olsa jolsa@kernel.org Link: https://lore.kernel.org/r/20221025134148.3300700-6-jolsa@kernel.org Signed-off-by: Alexei Starovoitov ast@kernel.org --- tools/testing/selftests/bpf/trace_helpers.c | 20 +++++++++++++------- tools/testing/selftests/bpf/trace_helpers.h | 2 ++ 2 files changed, 15 insertions(+), 7 deletions(-)
diff --git a/tools/testing/selftests/bpf/trace_helpers.c b/tools/testing/selftests/bpf/trace_helpers.c index 9c4be2cdb21a..09a16a77bae4 100644 --- a/tools/testing/selftests/bpf/trace_helpers.c +++ b/tools/testing/selftests/bpf/trace_helpers.c @@ -23,7 +23,7 @@ static int ksym_cmp(const void *p1, const void *p2) return ((struct ksym *)p1)->addr - ((struct ksym *)p2)->addr; }
-int load_kallsyms(void) +int load_kallsyms_refresh(void) { FILE *f; char func[256], buf[256]; @@ -31,12 +31,7 @@ int load_kallsyms(void) void *addr; int i = 0;
- /* - * This is called/used from multiplace places, - * load symbols just once. - */ - if (sym_cnt) - return 0; + sym_cnt = 0;
f = fopen("/proc/kallsyms", "r"); if (!f) @@ -57,6 +52,17 @@ int load_kallsyms(void) return 0; }
+int load_kallsyms(void) +{ + /* + * This is called/used from multiplace places, + * load symbols just once. + */ + if (sym_cnt) + return 0; + return load_kallsyms_refresh(); +} + struct ksym *ksym_search(long key) { int start = 0, end = sym_cnt; diff --git a/tools/testing/selftests/bpf/trace_helpers.h b/tools/testing/selftests/bpf/trace_helpers.h index 238a9c98cde2..53efde0e2998 100644 --- a/tools/testing/selftests/bpf/trace_helpers.h +++ b/tools/testing/selftests/bpf/trace_helpers.h @@ -10,6 +10,8 @@ struct ksym { };
int load_kallsyms(void); +int load_kallsyms_refresh(void); + struct ksym *ksym_search(long key); long ksym_get_addr(const char *name);