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| author | Ilya Leoshkevich <iii@linux.ibm.com> | 2020-07-20 13:48:06 +0200 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2020-07-21 13:26:26 -0700 |
| commit | e4d9c2320716ea0e9ef59f503ddd8f253a642ddd (patch) | |
| tree | 6f0b5d742197e5600edb95fb3a7fc16f1b4c4335 /samples/bpf/tracex1_kern.c | |
| parent | 6bd557275ad5a1adaff5082f4e24218ba344e0c0 (diff) | |
| download | lwn-e4d9c2320716ea0e9ef59f503ddd8f253a642ddd.tar.gz lwn-e4d9c2320716ea0e9ef59f503ddd8f253a642ddd.zip | |
samples/bpf, selftests/bpf: Use bpf_probe_read_kernel
A handful of samples and selftests fail to build on s390, because
after commit 0ebeea8ca8a4 ("bpf: Restrict bpf_probe_read{, str}()
only to archs where they work") bpf_probe_read is not available
anymore.
Fix by using bpf_probe_read_kernel.
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200720114806.88823-1-iii@linux.ibm.com
Diffstat (limited to 'samples/bpf/tracex1_kern.c')
| -rw-r--r-- | samples/bpf/tracex1_kern.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/samples/bpf/tracex1_kern.c b/samples/bpf/tracex1_kern.c index 8e2610e14475..3f4599c9a202 100644 --- a/samples/bpf/tracex1_kern.c +++ b/samples/bpf/tracex1_kern.c @@ -11,7 +11,12 @@ #include <bpf/bpf_helpers.h> #include <bpf/bpf_tracing.h> -#define _(P) ({typeof(P) val = 0; bpf_probe_read(&val, sizeof(val), &P); val;}) +#define _(P) \ + ({ \ + typeof(P) val = 0; \ + bpf_probe_read_kernel(&val, sizeof(val), &(P)); \ + val; \ + }) /* kprobe is NOT a stable ABI * kernel functions can be removed, renamed or completely change semantics. @@ -34,7 +39,7 @@ int bpf_prog1(struct pt_regs *ctx) dev = _(skb->dev); len = _(skb->len); - bpf_probe_read(devname, sizeof(devname), dev->name); + bpf_probe_read_kernel(devname, sizeof(devname), dev->name); if (devname[0] == 'l' && devname[1] == 'o') { char fmt[] = "skb %p len %d\n"; |