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selftests/bpf: trace_helpers.c: Add a global ksyms initialization mutex

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As Jirka said [0], we just need to make sure that global ksyms
initialization won't race.

[0] https://lore.kernel.org/lkml/ZPCbAs3ItjRd8XVh@krava/

Signed-off-by: Rong Tao <rongtao@cestc.cn>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/bpf/tencent_5D0A837E219E2CFDCB0495DAD7D5D1204407@qq.com
This commit is contained in:
Rong Tao 2023-09-07 09:59:14 +08:00 committed by Andrii Nakryiko
parent c698eaebdf
commit a28b1ba259
1 changed files with 4 additions and 0 deletions
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4
tools/testing/selftests/bpf/trace_helpers.c
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@ -7,6 +7,7 @@
#include <errno.h>
#include <fcntl.h>
#include <poll.h>
#include <pthread.h>
#include <unistd.h>
#include <linux/perf_event.h>
#include <sys/mman.h>
@ -26,6 +27,7 @@ struct ksyms {
};
static struct ksyms *ksyms;
static pthread_mutex_t ksyms_mutex = PTHREAD_MUTEX_INITIALIZER;
static int ksyms__add_symbol(struct ksyms *ksyms, const char *name,
unsigned long addr)
@ -109,8 +111,10 @@ error:
int load_kallsyms(void)
{
pthread_mutex_lock(&ksyms_mutex);
if (!ksyms)
ksyms = load_kallsyms_local();
pthread_mutex_unlock(&ksyms_mutex);
return ksyms ? 0 : 1;
}