diff options
Diffstat (limited to 'samples/bpf/sampleip_user.c')
| -rw-r--r-- | samples/bpf/sampleip_user.c | 11 |
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 *)); |