forked from luck/tmp_suning_uos_patched
d72386fe7a
libbpf_util.h header was recently exposed as public as a dependency of
xsk.h. In addition to memory barriers, it contained logging helpers,
which are not supposed to be exposed. This patch moves those into
libbpf_internal.h, which is kept as an internal header.
Cc: Stanislav Fomichev <sdf@google.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Fixes: 7080da8909 ("libbpf: add libbpf_util.h to header install.")
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
48 lines
1.6 KiB
C
48 lines
1.6 KiB
C
/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
|
|
/* Copyright (c) 2019 Facebook */
|
|
|
|
#ifndef __LIBBPF_LIBBPF_UTIL_H
|
|
#define __LIBBPF_LIBBPF_UTIL_H
|
|
|
|
#include <stdbool.h>
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/* Use these barrier functions instead of smp_[rw]mb() when they are
|
|
* used in a libbpf header file. That way they can be built into the
|
|
* application that uses libbpf.
|
|
*/
|
|
#if defined(__i386__) || defined(__x86_64__)
|
|
# define libbpf_smp_rmb() asm volatile("" : : : "memory")
|
|
# define libbpf_smp_wmb() asm volatile("" : : : "memory")
|
|
# define libbpf_smp_mb() \
|
|
asm volatile("lock; addl $0,-4(%%rsp)" : : : "memory", "cc")
|
|
/* Hinders stores to be observed before older loads. */
|
|
# define libbpf_smp_rwmb() asm volatile("" : : : "memory")
|
|
#elif defined(__aarch64__)
|
|
# define libbpf_smp_rmb() asm volatile("dmb ishld" : : : "memory")
|
|
# define libbpf_smp_wmb() asm volatile("dmb ishst" : : : "memory")
|
|
# define libbpf_smp_mb() asm volatile("dmb ish" : : : "memory")
|
|
# define libbpf_smp_rwmb() libbpf_smp_mb()
|
|
#elif defined(__arm__)
|
|
/* These are only valid for armv7 and above */
|
|
# define libbpf_smp_rmb() asm volatile("dmb ish" : : : "memory")
|
|
# define libbpf_smp_wmb() asm volatile("dmb ishst" : : : "memory")
|
|
# define libbpf_smp_mb() asm volatile("dmb ish" : : : "memory")
|
|
# define libbpf_smp_rwmb() libbpf_smp_mb()
|
|
#else
|
|
/* Architecture missing native barrier functions. */
|
|
# define libbpf_smp_rmb() __sync_synchronize()
|
|
# define libbpf_smp_wmb() __sync_synchronize()
|
|
# define libbpf_smp_mb() __sync_synchronize()
|
|
# define libbpf_smp_rwmb() __sync_synchronize()
|
|
#endif
|
|
|
|
#ifdef __cplusplus
|
|
} /* extern "C" */
|
|
#endif
|
|
|
|
#endif
|