Commit 10705b2b authored by Jiri Olsa's avatar Jiri Olsa Committed by Alexei Starovoitov
Browse files

selftests/bpf: Add load_kallsyms_refresh function 



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: default avatarSong Liu <song@kernel.org>
Signed-off-by: default avatarJiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20221025134148.3300700-6-jolsa@kernel.org


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent e22061b2

tools/testing/selftests/bpf/trace_helpers.c

+13 −7
Original line number Diff line number Diff line
@@ -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;

tools/testing/selftests/bpf/trace_helpers.h

+2 −0
Original line number Diff line number Diff line
@@ -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);