[PATCH bpf-next v2 3/3] samples: bpf: syscal_nrs: use mmap2 if defined
From: Ivan Khoronzhuk <hidden>
Date: 2019-08-15 12:14:50
Also in:
bpf, lkml
Subsystem:
bpf [general] (safe dynamic programs and tools), the rest · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Linus Torvalds
For arm32 xdp sockets mmap2 is preferred, so use it if it's defined. Declaration of __NR_mmap can be skipped and it breaks build. Signed-off-by: Ivan Khoronzhuk <redacted> --- samples/bpf/syscall_nrs.c | 6 ++++++ samples/bpf/tracex5_kern.c | 13 +++++++++++++ 2 files changed, 19 insertions(+)
diff --git a/samples/bpf/syscall_nrs.c b/samples/bpf/syscall_nrs.c
index 516e255cbe8f..88f940052450 100644
--- a/samples/bpf/syscall_nrs.c
+++ b/samples/bpf/syscall_nrs.c@@ -9,5 +9,11 @@ void syscall_defines(void) COMMENT("Linux system call numbers."); SYSNR(__NR_write); SYSNR(__NR_read); +#ifdef __NR_mmap2 + SYSNR(__NR_mmap2); +#endif +#ifdef __NR_mmap SYSNR(__NR_mmap); +#endif + }
diff --git a/samples/bpf/tracex5_kern.c b/samples/bpf/tracex5_kern.c
index f57f4e1ea1ec..35cb0eed3be5 100644
--- a/samples/bpf/tracex5_kern.c
+++ b/samples/bpf/tracex5_kern.c@@ -68,12 +68,25 @@ PROG(SYS__NR_read)(struct pt_regs *ctx) return 0; } +#ifdef __NR_mmap2 +PROG(SYS__NR_mmap2)(struct pt_regs *ctx) +{ + char fmt[] = "mmap2\n"; + + bpf_trace_printk(fmt, sizeof(fmt)); + return 0; +} +#endif + +#ifdef __NR_mmap PROG(SYS__NR_mmap)(struct pt_regs *ctx) { char fmt[] = "mmap\n"; + bpf_trace_printk(fmt, sizeof(fmt)); return 0; } +#endif char _license[] SEC("license") = "GPL"; u32 _version SEC("version") = LINUX_VERSION_CODE;
--
2.17.1