Merge branch 'parisc-5.8-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux into master
Pull parisc fixes from Helge Deller: "Two fixes: - Add the cmpxchg() function for pointers to u8 values. This fixes a kernel linking error when building the tusb1210 driver (from Liam Beguin). - Add a define for atomic64_set_release() to fix CPU soft lockups which happen because of missing unlocks while processing bit operations (from John David Anglin)" * 'parisc-5.8-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: parisc: Add atomic64_set_release() define to avoid CPU soft lockups parisc: add support for cmpxchg on u8 pointers
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40c60ac321
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@ -212,6 +212,8 @@ atomic64_set(atomic64_t *v, s64 i)
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_atomic_spin_unlock_irqrestore(v, flags);
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}
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#define atomic64_set_release(v, i) atomic64_set((v), (i))
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static __inline__ s64
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atomic64_read(const atomic64_t *v)
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{
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@ -60,6 +60,7 @@ extern void __cmpxchg_called_with_bad_pointer(void);
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extern unsigned long __cmpxchg_u32(volatile unsigned int *m, unsigned int old,
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unsigned int new_);
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extern u64 __cmpxchg_u64(volatile u64 *ptr, u64 old, u64 new_);
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extern u8 __cmpxchg_u8(volatile u8 *ptr, u8 old, u8 new_);
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/* don't worry...optimizer will get rid of most of this */
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static inline unsigned long
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@ -71,6 +72,7 @@ __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new_, int size)
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#endif
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case 4: return __cmpxchg_u32((unsigned int *)ptr,
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(unsigned int)old, (unsigned int)new_);
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case 1: return __cmpxchg_u8((u8 *)ptr, (u8)old, (u8)new_);
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}
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__cmpxchg_called_with_bad_pointer();
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return old;
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@ -79,3 +79,15 @@ unsigned long __cmpxchg_u32(volatile unsigned int *ptr, unsigned int old, unsign
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_atomic_spin_unlock_irqrestore(ptr, flags);
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return (unsigned long)prev;
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}
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u8 __cmpxchg_u8(volatile u8 *ptr, u8 old, u8 new)
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{
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unsigned long flags;
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u8 prev;
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_atomic_spin_lock_irqsave(ptr, flags);
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if ((prev = *ptr) == old)
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*ptr = new;
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_atomic_spin_unlock_irqrestore(ptr, flags);
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return prev;
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}
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