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sparc32: unify __cmpxchg_u{32,64}

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Add a macro that expands to one of those when given u32 or u64
as an argument - atomic32.c has a lot of similar stuff already.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Al Viro 2024-04-01 22:12:30 -04:00 committed by Paul E. McKenney
parent b7e2a6389e
commit d7b52b48f0
1 changed files with 15 additions and 24 deletions
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39
arch/sparc/lib/atomic32.c
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@ -159,32 +159,23 @@ unsigned long sp32___change_bit(unsigned long *addr, unsigned long mask)
}
EXPORT_SYMBOL(sp32___change_bit);
u32 __cmpxchg_u32(volatile u32 *ptr, u32 old, u32 new)
{
unsigned long flags;
u32 prev;
#define CMPXCHG(T) \
T __cmpxchg_##T(volatile T *ptr, T old, T new) \
{ \
unsigned long flags; \
T prev; \
\
spin_lock_irqsave(ATOMIC_HASH(ptr), flags); \
if ((prev = *ptr) == old) \
*ptr = new; \
spin_unlock_irqrestore(ATOMIC_HASH(ptr), flags);\
\
return prev; \
}
spin_lock_irqsave(ATOMIC_HASH(ptr), flags);
if ((prev = *ptr) == old)
*ptr = new;
spin_unlock_irqrestore(ATOMIC_HASH(ptr), flags);
return prev;
}
CMPXCHG(u32)
CMPXCHG(u64)
EXPORT_SYMBOL(__cmpxchg_u32);
u64 __cmpxchg_u64(volatile u64 *ptr, u64 old, u64 new)
{
unsigned long flags;
u64 prev;
spin_lock_irqsave(ATOMIC_HASH(ptr), flags);
if ((prev = *ptr) == old)
*ptr = new;
spin_unlock_irqrestore(ATOMIC_HASH(ptr), flags);
return prev;
}
EXPORT_SYMBOL(__cmpxchg_u64);
unsigned long __xchg_u32(volatile u32 *ptr, u32 new)