https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 80e78fcce86de0288793a0ef0f6acf37656ee4cf authored by Linus Torvalds on 11 September 2022, 20:22:01 UTC
Linux 6.0-rc5
Linux 6.0-rc5
Tip revision: 80e78fc
barrier.h
/* SPDX-License-Identifier: GPL-2.0 */
#include <stdlib.h>
#if defined(__i386__) || defined(__x86_64__)
#define barrier() asm volatile("" ::: "memory")
#define virt_mb() __sync_synchronize()
#define virt_rmb() barrier()
#define virt_wmb() barrier()
/* Atomic store should be enough, but gcc generates worse code in that case. */
#define virt_store_mb(var, value) do { \
typeof(var) virt_store_mb_value = (value); \
__atomic_exchange(&(var), &virt_store_mb_value, &virt_store_mb_value, \
__ATOMIC_SEQ_CST); \
barrier(); \
} while (0);
/* Weak barriers should be used. If not - it's a bug */
# define mb() abort()
# define dma_rmb() abort()
# define dma_wmb() abort()
#elif defined(__aarch64__)
#define dmb(opt) asm volatile("dmb " #opt : : : "memory")
#define virt_mb() __sync_synchronize()
#define virt_rmb() dmb(ishld)
#define virt_wmb() dmb(ishst)
#define virt_store_mb(var, value) do { WRITE_ONCE(var, value); dmb(ish); } while (0)
/* Weak barriers should be used. If not - it's a bug */
# define mb() abort()
# define dma_rmb() abort()
# define dma_wmb() abort()
#else
#error Please fill in barrier macros
#endif