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https://github.com/Fishwaldo/Star64_linux.git
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a6aac408c5
The macro for libbpf_smp_store_release() doesn't build on arm64, fix it.
Fixes: 291471dd15 ("libbpf, xsk: Add libbpf_smp_store_release libbpf_smp_load_acquire")
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210308182521.155536-1-jean-philippe@linaro.org
75 lines
1.8 KiB
C
75 lines
1.8 KiB
C
/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
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/* Copyright (c) 2019 Facebook */
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#ifndef __LIBBPF_LIBBPF_UTIL_H
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#define __LIBBPF_LIBBPF_UTIL_H
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#include <stdbool.h>
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#include <linux/compiler.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Use these barrier functions instead of smp_[rw]mb() when they are
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* used in a libbpf header file. That way they can be built into the
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* application that uses libbpf.
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*/
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#if defined(__i386__) || defined(__x86_64__)
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# define libbpf_smp_store_release(p, v) \
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do { \
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asm volatile("" : : : "memory"); \
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WRITE_ONCE(*p, v); \
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} while (0)
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# define libbpf_smp_load_acquire(p) \
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({ \
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typeof(*p) ___p1 = READ_ONCE(*p); \
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asm volatile("" : : : "memory"); \
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___p1; \
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})
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#elif defined(__aarch64__)
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# define libbpf_smp_store_release(p, v) \
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asm volatile ("stlr %w1, %0" : "=Q" (*p) : "r" (v) : "memory")
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# define libbpf_smp_load_acquire(p) \
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({ \
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typeof(*p) ___p1; \
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asm volatile ("ldar %w0, %1" \
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: "=r" (___p1) : "Q" (*p) : "memory"); \
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___p1; \
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})
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#elif defined(__riscv)
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# define libbpf_smp_store_release(p, v) \
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do { \
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asm volatile ("fence rw,w" : : : "memory"); \
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WRITE_ONCE(*p, v); \
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} while (0)
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# define libbpf_smp_load_acquire(p) \
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({ \
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typeof(*p) ___p1 = READ_ONCE(*p); \
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asm volatile ("fence r,rw" : : : "memory"); \
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___p1; \
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})
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#endif
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#ifndef libbpf_smp_store_release
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#define libbpf_smp_store_release(p, v) \
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do { \
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__sync_synchronize(); \
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WRITE_ONCE(*p, v); \
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} while (0)
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#endif
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#ifndef libbpf_smp_load_acquire
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#define libbpf_smp_load_acquire(p) \
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({ \
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typeof(*p) ___p1 = READ_ONCE(*p); \
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__sync_synchronize(); \
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___p1; \
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})
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#endif
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif
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