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Diffstat (limited to 'tools/arch/ia64/include/asm/barrier.h')
| -rw-r--r-- | tools/arch/ia64/include/asm/barrier.h | 62 |
1 files changed, 0 insertions, 62 deletions
diff --git a/tools/arch/ia64/include/asm/barrier.h b/tools/arch/ia64/include/asm/barrier.h deleted file mode 100644 index 4d471d9511a5..000000000000 --- a/tools/arch/ia64/include/asm/barrier.h +++ /dev/null @@ -1,62 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ -/* - * Copied from the kernel sources to tools/: - * - * Memory barrier definitions. This is based on information published - * in the Processor Abstraction Layer and the System Abstraction Layer - * manual. - * - * Copyright (C) 1998-2003 Hewlett-Packard Co - * David Mosberger-Tang <davidm@hpl.hp.com> - * Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com> - * Copyright (C) 1999 Don Dugger <don.dugger@intel.com> - */ -#ifndef _TOOLS_LINUX_ASM_IA64_BARRIER_H -#define _TOOLS_LINUX_ASM_IA64_BARRIER_H - -#include <linux/compiler.h> - -/* - * Macros to force memory ordering. In these descriptions, "previous" - * and "subsequent" refer to program order; "visible" means that all - * architecturally visible effects of a memory access have occurred - * (at a minimum, this means the memory has been read or written). - * - * wmb(): Guarantees that all preceding stores to memory- - * like regions are visible before any subsequent - * stores and that all following stores will be - * visible only after all previous stores. - * rmb(): Like wmb(), but for reads. - * mb(): wmb()/rmb() combo, i.e., all previous memory - * accesses are visible before all subsequent - * accesses and vice versa. This is also known as - * a "fence." - * - * Note: "mb()" and its variants cannot be used as a fence to order - * accesses to memory mapped I/O registers. For that, mf.a needs to - * be used. However, we don't want to always use mf.a because (a) - * it's (presumably) much slower than mf and (b) mf.a is supported for - * sequential memory pages only. - */ - -/* XXX From arch/ia64/include/uapi/asm/gcc_intrin.h */ -#define ia64_mf() asm volatile ("mf" ::: "memory") - -#define mb() ia64_mf() -#define rmb() mb() -#define wmb() mb() - -#define smp_store_release(p, v) \ -do { \ - barrier(); \ - WRITE_ONCE(*p, v); \ -} while (0) - -#define smp_load_acquire(p) \ -({ \ - typeof(*p) ___p1 = READ_ONCE(*p); \ - barrier(); \ - ___p1; \ -}) - -#endif /* _TOOLS_LINUX_ASM_IA64_BARRIER_H */ |