Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
+16
+2
arch/parisc/include/asm/atomic.h
+2
arch/parisc/include/asm/atomic.h
+2
arch/parisc/include/asm/cmpxchg.h
+2
arch/parisc/include/asm/cmpxchg.h
···
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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_);
63
+
extern u8 __cmpxchg_u8(volatile u8 *ptr, u8 old, u8 new_);
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64
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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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#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;
+12
arch/parisc/lib/bitops.c
+12
arch/parisc/lib/bitops.c
···
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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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+
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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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+
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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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+
}