mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-08-05 16:54:27 +00:00
7c1e94f5dc
There's some expressed interest in having the compiler flag -Wconversion detect at build time certain kinds of potential problems: https://lore.kernel.org/lkml/20250103182532.GB781381@e132581.arm.com/ As feature detection passes -Wconversion from CFLAGS when set, the feature detection compile tests need to not fail because of -Wconversion as the failure will be interpretted as a missing feature. Switch various types to avoid the -Wconversion issue, the exact meaning of the code is unimportant as it is typically looking for header file definitions. Signed-off-by: Ian Rogers <irogers@google.com> Reviewed-by: James Clark <james.clark@linaro.org> Link: https://lore.kernel.org/r/20250106215443.198633-1-irogers@google.com Signed-off-by: Namhyung Kim <namhyung@kernel.org>
48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <asm/unistd.h>
|
|
#include <linux/bpf.h>
|
|
#include <unistd.h>
|
|
|
|
#ifndef __NR_bpf
|
|
# if defined(__i386__)
|
|
# define __NR_bpf 357
|
|
# elif defined(__x86_64__)
|
|
# define __NR_bpf 321
|
|
# elif defined(__aarch64__)
|
|
# define __NR_bpf 280
|
|
# elif defined(__sparc__)
|
|
# define __NR_bpf 349
|
|
# elif defined(__s390__)
|
|
# define __NR_bpf 351
|
|
# elif defined(__mips__) && defined(_ABIO32)
|
|
# define __NR_bpf 4355
|
|
# elif defined(__mips__) && defined(_ABIN32)
|
|
# define __NR_bpf 6319
|
|
# elif defined(__mips__) && defined(_ABI64)
|
|
# define __NR_bpf 5315
|
|
# else
|
|
# error __NR_bpf not defined. libbpf does not support your arch.
|
|
# endif
|
|
#endif
|
|
|
|
int main(void)
|
|
{
|
|
union bpf_attr attr;
|
|
|
|
/* Check fields in attr */
|
|
attr.prog_type = BPF_PROG_TYPE_KPROBE;
|
|
attr.insn_cnt = 0;
|
|
attr.insns = 0;
|
|
attr.license = 0;
|
|
attr.log_buf = 0;
|
|
attr.log_size = 0;
|
|
attr.log_level = 0;
|
|
attr.kern_version = 0;
|
|
attr.prog_flags = 0;
|
|
|
|
/*
|
|
* Test existence of __NR_bpf and BPF_PROG_LOAD.
|
|
* This call should fail if we run the testcase.
|
|
*/
|
|
return syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr)) == 0;
|
|
}
|