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selftests/bpf: Add load_kallsyms_refresh function

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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>
This commit is contained in:
Jiri Olsa 2022-10-25 15:41:45 +02:00 committed by Alexei Starovoitov
parent e22061b2d3
commit 10705b2b7a
2 changed files with 15 additions and 7 deletions
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20
tools/testing/selftests/bpf/trace_helpers.c
View File

@ -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;

2
tools/testing/selftests/bpf/trace_helpers.h
View File

@ -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);