mm: fix exec activate_mm vs TLB shootdown and lazy tlb switching race
[linux/fpc-iii.git] / arch / parisc / lib / bitops.c
blob2e4d1f05a92646b36b7d4eaabffaad6637bac430
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * bitops.c: atomic operations which got too long to be inlined all over
4 * the place.
5 *
6 * Copyright 1999 Philipp Rumpf (prumpf@tux.org)
7 * Copyright 2000 Grant Grundler (grundler@cup.hp.com)
8 */
10 #include <linux/kernel.h>
11 #include <linux/spinlock.h>
12 #include <linux/atomic.h>
14 #ifdef CONFIG_SMP
15 arch_spinlock_t __atomic_hash[ATOMIC_HASH_SIZE] __lock_aligned = {
16 [0 ... (ATOMIC_HASH_SIZE-1)] = __ARCH_SPIN_LOCK_UNLOCKED
18 #endif
20 #ifdef CONFIG_64BIT
21 unsigned long __xchg64(unsigned long x, unsigned long *ptr)
23 unsigned long temp, flags;
25 _atomic_spin_lock_irqsave(ptr, flags);
26 temp = *ptr;
27 *ptr = x;
28 _atomic_spin_unlock_irqrestore(ptr, flags);
29 return temp;
31 #endif
33 unsigned long __xchg32(int x, int *ptr)
35 unsigned long flags;
36 long temp;
38 _atomic_spin_lock_irqsave(ptr, flags);
39 temp = (long) *ptr; /* XXX - sign extension wanted? */
40 *ptr = x;
41 _atomic_spin_unlock_irqrestore(ptr, flags);
42 return (unsigned long)temp;
46 unsigned long __xchg8(char x, char *ptr)
48 unsigned long flags;
49 long temp;
51 _atomic_spin_lock_irqsave(ptr, flags);
52 temp = (long) *ptr; /* XXX - sign extension wanted? */
53 *ptr = x;
54 _atomic_spin_unlock_irqrestore(ptr, flags);
55 return (unsigned long)temp;
59 u64 __cmpxchg_u64(volatile u64 *ptr, u64 old, u64 new)
61 unsigned long flags;
62 u64 prev;
64 _atomic_spin_lock_irqsave(ptr, flags);
65 if ((prev = *ptr) == old)
66 *ptr = new;
67 _atomic_spin_unlock_irqrestore(ptr, flags);
68 return prev;
71 unsigned long __cmpxchg_u32(volatile unsigned int *ptr, unsigned int old, unsigned int new)
73 unsigned long flags;
74 unsigned int prev;
76 _atomic_spin_lock_irqsave(ptr, flags);
77 if ((prev = *ptr) == old)
78 *ptr = new;
79 _atomic_spin_unlock_irqrestore(ptr, flags);
80 return (unsigned long)prev;
83 u8 __cmpxchg_u8(volatile u8 *ptr, u8 old, u8 new)
85 unsigned long flags;
86 u8 prev;
88 _atomic_spin_lock_irqsave(ptr, flags);
89 if ((prev = *ptr) == old)
90 *ptr = new;
91 _atomic_spin_unlock_irqrestore(ptr, flags);
92 return prev;