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-rw-r--r--samples/bpf/sampleip_user.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/samples/bpf/sampleip_user.c b/samples/bpf/sampleip_user.c
index 921c505bb567..9283f47844fb 100644
--- a/samples/bpf/sampleip_user.c
+++ b/samples/bpf/sampleip_user.c
@@ -21,10 +21,10 @@
#define DEFAULT_FREQ 99
#define DEFAULT_SECS 5
#define MAX_IPS 8192
-#define PAGE_OFFSET 0xffff880000000000
static int map_fd;
static int nr_cpus;
+static long _text_addr;
static void usage(void)
{
@@ -108,7 +108,7 @@ static void print_ip_map(int fd)
/* sort and print */
qsort(counts, max, sizeof(struct ipcount), count_cmp);
for (i = 0; i < max; i++) {
- if (counts[i].ip > PAGE_OFFSET) {
+ if (counts[i].ip > _text_addr) {
sym = ksym_search(counts[i].ip);
if (!sym) {
printf("ksym not found. Is kallsyms loaded?\n");
@@ -169,6 +169,13 @@ int main(int argc, char **argv)
return 2;
}
+ /* used to determine whether the address is kernel space */
+ _text_addr = ksym_get_addr("_text");
+ if (!_text_addr) {
+ fprintf(stderr, "ERROR: no '_text' in /proc/kallsyms\n");
+ return 3;
+ }
+
/* create perf FDs for each CPU */
nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
links = calloc(nr_cpus, sizeof(struct bpf_link *));