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bfc18e389c
While __atomic_add_unless() was originally intended as a building-block
for atomic_add_unless(), it's now used in a number of places around the
kernel. It's the only common atomic operation named __atomic*(), rather
than atomic_*(), and for consistency it would be better named
atomic_fetch_add_unless().
This lack of consistency is slightly confusing, and gets in the way of
scripting atomics. Given that, let's clean things up and promote it to
an official part of the atomics API, in the form of
atomic_fetch_add_unless().
This patch converts definitions and invocations over to the new name,
including the instrumented version, using the following script:
----
git grep -w __atomic_add_unless | while read line; do
sed -i '{s/\<__atomic_add_unless\>/atomic_fetch_add_unless/}' "${line%%:*}";
done
git grep -w __arch_atomic_add_unless | while read line; do
sed -i '{s/\<__arch_atomic_add_unless\>/arch_atomic_fetch_add_unless/}' "${line%%:*}";
done
----
Note that we do not have atomic{64,_long}_fetch_add_unless(), which will
be introduced by later patches.
There should be no functional change as a result of this patch.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Will Deacon <will.deacon@arm.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Palmer Dabbelt <palmer@sifive.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/lkml/20180621121321.4761-2-mark.rutland@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
203 lines
4.3 KiB
C
203 lines
4.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* atomic32.c: 32-bit atomic_t implementation
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*
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* Copyright (C) 2004 Keith M Wesolowski
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* Copyright (C) 2007 Kyle McMartin
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*
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* Based on asm-parisc/atomic.h Copyright (C) 2000 Philipp Rumpf
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*/
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#include <linux/atomic.h>
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#include <linux/spinlock.h>
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#include <linux/module.h>
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#ifdef CONFIG_SMP
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#define ATOMIC_HASH_SIZE 4
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#define ATOMIC_HASH(a) (&__atomic_hash[(((unsigned long)a)>>8) & (ATOMIC_HASH_SIZE-1)])
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spinlock_t __atomic_hash[ATOMIC_HASH_SIZE] = {
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[0 ... (ATOMIC_HASH_SIZE-1)] = __SPIN_LOCK_UNLOCKED(__atomic_hash)
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};
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#else /* SMP */
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static DEFINE_SPINLOCK(dummy);
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#define ATOMIC_HASH_SIZE 1
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#define ATOMIC_HASH(a) (&dummy)
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#endif /* SMP */
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#define ATOMIC_FETCH_OP(op, c_op) \
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int atomic_fetch_##op(int i, atomic_t *v) \
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{ \
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int ret; \
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unsigned long flags; \
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spin_lock_irqsave(ATOMIC_HASH(v), flags); \
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\
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ret = v->counter; \
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v->counter c_op i; \
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\
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spin_unlock_irqrestore(ATOMIC_HASH(v), flags); \
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return ret; \
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} \
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EXPORT_SYMBOL(atomic_fetch_##op);
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#define ATOMIC_OP_RETURN(op, c_op) \
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int atomic_##op##_return(int i, atomic_t *v) \
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{ \
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int ret; \
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unsigned long flags; \
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spin_lock_irqsave(ATOMIC_HASH(v), flags); \
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\
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ret = (v->counter c_op i); \
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\
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spin_unlock_irqrestore(ATOMIC_HASH(v), flags); \
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return ret; \
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} \
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EXPORT_SYMBOL(atomic_##op##_return);
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ATOMIC_OP_RETURN(add, +=)
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ATOMIC_FETCH_OP(add, +=)
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ATOMIC_FETCH_OP(and, &=)
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ATOMIC_FETCH_OP(or, |=)
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ATOMIC_FETCH_OP(xor, ^=)
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#undef ATOMIC_FETCH_OP
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#undef ATOMIC_OP_RETURN
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int atomic_xchg(atomic_t *v, int new)
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{
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int ret;
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unsigned long flags;
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spin_lock_irqsave(ATOMIC_HASH(v), flags);
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ret = v->counter;
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v->counter = new;
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spin_unlock_irqrestore(ATOMIC_HASH(v), flags);
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return ret;
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}
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EXPORT_SYMBOL(atomic_xchg);
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int atomic_cmpxchg(atomic_t *v, int old, int new)
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{
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int ret;
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unsigned long flags;
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spin_lock_irqsave(ATOMIC_HASH(v), flags);
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ret = v->counter;
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if (likely(ret == old))
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v->counter = new;
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spin_unlock_irqrestore(ATOMIC_HASH(v), flags);
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return ret;
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}
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EXPORT_SYMBOL(atomic_cmpxchg);
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int atomic_fetch_add_unless(atomic_t *v, int a, int u)
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{
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int ret;
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unsigned long flags;
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spin_lock_irqsave(ATOMIC_HASH(v), flags);
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ret = v->counter;
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if (ret != u)
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v->counter += a;
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spin_unlock_irqrestore(ATOMIC_HASH(v), flags);
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return ret;
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}
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EXPORT_SYMBOL(atomic_fetch_add_unless);
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/* Atomic operations are already serializing */
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void atomic_set(atomic_t *v, int i)
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{
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unsigned long flags;
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spin_lock_irqsave(ATOMIC_HASH(v), flags);
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v->counter = i;
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spin_unlock_irqrestore(ATOMIC_HASH(v), flags);
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}
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EXPORT_SYMBOL(atomic_set);
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unsigned long ___set_bit(unsigned long *addr, unsigned long mask)
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{
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unsigned long old, flags;
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spin_lock_irqsave(ATOMIC_HASH(addr), flags);
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old = *addr;
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*addr = old | mask;
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spin_unlock_irqrestore(ATOMIC_HASH(addr), flags);
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return old & mask;
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}
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EXPORT_SYMBOL(___set_bit);
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unsigned long ___clear_bit(unsigned long *addr, unsigned long mask)
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{
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unsigned long old, flags;
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spin_lock_irqsave(ATOMIC_HASH(addr), flags);
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old = *addr;
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*addr = old & ~mask;
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spin_unlock_irqrestore(ATOMIC_HASH(addr), flags);
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return old & mask;
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}
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EXPORT_SYMBOL(___clear_bit);
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unsigned long ___change_bit(unsigned long *addr, unsigned long mask)
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{
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unsigned long old, flags;
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spin_lock_irqsave(ATOMIC_HASH(addr), flags);
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old = *addr;
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*addr = old ^ mask;
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spin_unlock_irqrestore(ATOMIC_HASH(addr), flags);
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return old & mask;
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}
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EXPORT_SYMBOL(___change_bit);
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unsigned long __cmpxchg_u32(volatile u32 *ptr, u32 old, u32 new)
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{
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unsigned long flags;
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u32 prev;
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spin_lock_irqsave(ATOMIC_HASH(ptr), flags);
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if ((prev = *ptr) == old)
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*ptr = new;
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spin_unlock_irqrestore(ATOMIC_HASH(ptr), flags);
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return (unsigned long)prev;
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}
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EXPORT_SYMBOL(__cmpxchg_u32);
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u64 __cmpxchg_u64(u64 *ptr, u64 old, u64 new)
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{
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unsigned long flags;
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u64 prev;
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spin_lock_irqsave(ATOMIC_HASH(ptr), flags);
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if ((prev = *ptr) == old)
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*ptr = new;
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spin_unlock_irqrestore(ATOMIC_HASH(ptr), flags);
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return prev;
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}
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EXPORT_SYMBOL(__cmpxchg_u64);
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unsigned long __xchg_u32(volatile u32 *ptr, u32 new)
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{
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unsigned long flags;
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u32 prev;
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spin_lock_irqsave(ATOMIC_HASH(ptr), flags);
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prev = *ptr;
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*ptr = new;
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spin_unlock_irqrestore(ATOMIC_HASH(ptr), flags);
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return (unsigned long)prev;
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}
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EXPORT_SYMBOL(__xchg_u32);
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