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cb658e9724
This patch makes sure we build AF_XDP-related code as part of libbpf. This also required copying few uapi/linux headers and adding few used definitions in include headers. Signed-off-by: Andrii Nakryiko <andriin@fb.com>
53 lines
1.1 KiB
C
53 lines
1.1 KiB
C
/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
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#ifndef __LINUX_COMPILER_H
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#define __LINUX_COMPILER_H
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#define likely(x) __builtin_expect(!!(x), 1)
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#define unlikely(x) __builtin_expect(!!(x), 0)
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#define READ_ONCE(x) (*(volatile typeof(x) *)&x)
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#define WRITE_ONCE(x, v) (*(volatile typeof(x) *)&x) = (v)
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#define barrier() asm volatile("" ::: "memory")
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#if defined(__x86_64__)
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# define smp_rmb() asm volatile("lfence" ::: "memory")
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# define smp_wmb() asm volatile("sfence" ::: "memory")
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# define smp_store_release(p, v) \
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do { \
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barrier(); \
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WRITE_ONCE(*p, v); \
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} while (0)
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# define smp_load_acquire(p) \
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({ \
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typeof(*p) ___p = READ_ONCE(*p); \
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barrier(); \
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___p; \
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})
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#else
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# define smp_mb() __sync_synchronize()
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# define smp_rmb() smp_mb()
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# define smp_wmb() smp_mb()
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# define smp_store_release(p, v) \
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do { \
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smp_mb(); \
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WRITE_ONCE(*p, v); \
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} while (0)
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# define smp_load_acquire(p) \
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({ \
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typeof(*p) ___p = READ_ONCE(*p); \
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smp_mb(); \
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___p; \
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})
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#endif /* defined(__x86_64__) */
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#endif
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