diff options
| author | Hou Tao <houtao1@huawei.com> | 2022-11-16 15:23:48 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-12-19 12:41:02 +0100 |
| commit | 0a81076a3681f30a9c35ff4b16ac93d09a98120c (patch) | |
| tree | b18e6729da7d38af6b3679b254aa5fb7088f4e57 /tools/lib | |
| parent | 1798b62d642e7b3d4ea3403914c3caf4e438465d (diff) | |
libbpf: Use page size as max_entries when probing ring buffer map
[ Upstream commit 689eb2f1ba46b4b02195ac2a71c55b96d619ebf8 ]
Using page size as max_entries when probing ring buffer map, else the
probe may fail on host with 64KB page size (e.g., an ARM64 host).
After the fix, the output of "bpftool feature" on above host will be
correct.
Before :
eBPF map_type ringbuf is NOT available
eBPF map_type user_ringbuf is NOT available
After :
eBPF map_type ringbuf is available
eBPF map_type user_ringbuf is available
Signed-off-by: Hou Tao <houtao1@huawei.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20221116072351.1168938-2-houtao@huaweicloud.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'tools/lib')
| -rw-r--r-- | tools/lib/bpf/libbpf_probes.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/lib/bpf/libbpf_probes.c b/tools/lib/bpf/libbpf_probes.c index 6d495656f554c..29f7cde107418 100644 --- a/tools/lib/bpf/libbpf_probes.c +++ b/tools/lib/bpf/libbpf_probes.c @@ -233,7 +233,7 @@ static int probe_map_create(enum bpf_map_type map_type) case BPF_MAP_TYPE_RINGBUF: key_size = 0; value_size = 0; - max_entries = 4096; + max_entries = sysconf(_SC_PAGE_SIZE); break; case BPF_MAP_TYPE_STRUCT_OPS: /* we'll get -ENOTSUPP for invalid BTF type ID for struct_ops */ |