Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
52 lines
1.0 KiB
C
52 lines
1.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
// Copyright (c) 2019 Facebook
|
|
|
|
#include <linux/bpf.h>
|
|
#include <stdint.h>
|
|
#include <bpf/bpf_helpers.h>
|
|
|
|
char _license[] SEC("license") = "GPL";
|
|
|
|
struct {
|
|
__uint(type, BPF_MAP_TYPE_ARRAY);
|
|
__uint(map_flags, BPF_F_MMAPABLE | BPF_F_RDONLY_PROG);
|
|
__type(key, __u32);
|
|
__type(value, char);
|
|
} rdonly_map SEC(".maps");
|
|
|
|
struct {
|
|
__uint(type, BPF_MAP_TYPE_ARRAY);
|
|
__uint(map_flags, BPF_F_MMAPABLE);
|
|
__type(key, __u32);
|
|
__type(value, __u64);
|
|
} data_map SEC(".maps");
|
|
|
|
__u64 in_val = 0;
|
|
__u64 out_val = 0;
|
|
|
|
SEC("raw_tracepoint/sys_enter")
|
|
int test_mmap(void *ctx)
|
|
{
|
|
int zero = 0, one = 1, two = 2, far = 1500;
|
|
__u64 val, *p;
|
|
|
|
out_val = in_val;
|
|
|
|
/* data_map[2] = in_val; */
|
|
bpf_map_update_elem(&data_map, &two, (const void *)&in_val, 0);
|
|
|
|
/* data_map[1] = data_map[0] * 2; */
|
|
p = bpf_map_lookup_elem(&data_map, &zero);
|
|
if (p) {
|
|
val = (*p) * 2;
|
|
bpf_map_update_elem(&data_map, &one, &val, 0);
|
|
}
|
|
|
|
/* data_map[far] = in_val * 3; */
|
|
val = in_val * 3;
|
|
bpf_map_update_elem(&data_map, &far, &val, 0);
|
|
|
|
return 0;
|
|
}
|
|
|