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11/17/2022 06:42:16 AM
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Kbuild
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agp.h
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asm-offsets.h
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asmregs.h
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atomic.h
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barrier.h
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bitops.h
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checksum.h
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cmpxchg.h
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compat.h
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parisc-device.h
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pgalloc.h
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ropes.h
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runway.h
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sections.h
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serial.h
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shmparam.h
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signal.h
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smp.h
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socket.h
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special_insns.h
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spinlock.h
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spinlock_types.h
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string.h
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superio.h
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switch_to.h
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syscall.h
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termios.h
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thread_info.h
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timex.h
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tlb.h
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tlbflush.h
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topology.h
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traps.h
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uaccess.h
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ucontext.h
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unaligned.h
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unistd.h
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unwind.h
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Editing: cmpxchg.h
Close
/* SPDX-License-Identifier: GPL-2.0 */ /* * forked from parisc asm/atomic.h which was: * Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org> * Copyright (C) 2006 Kyle McMartin <kyle@parisc-linux.org> */ #ifndef _ASM_PARISC_CMPXCHG_H_ #define _ASM_PARISC_CMPXCHG_H_ /* This should get optimized out since it's never called. ** Or get a link error if xchg is used "wrong". */ extern void __xchg_called_with_bad_pointer(void); /* __xchg32/64 defined in arch/parisc/lib/bitops.c */ extern unsigned long __xchg8(char, char *); extern unsigned long __xchg32(int, int *); #ifdef CONFIG_64BIT extern unsigned long __xchg64(unsigned long, unsigned long *); #endif /* optimizer better get rid of switch since size is a constant */ static inline unsigned long __xchg(unsigned long x, __volatile__ void *ptr, int size) { switch (size) { #ifdef CONFIG_64BIT case 8: return __xchg64(x, (unsigned long *) ptr); #endif case 4: return __xchg32((int) x, (int *) ptr); case 1: return __xchg8((char) x, (char *) ptr); } __xchg_called_with_bad_pointer(); return x; } /* ** REVISIT - Abandoned use of LDCW in xchg() for now: ** o need to test sizeof(*ptr) to avoid clearing adjacent bytes ** o and while we are at it, could CONFIG_64BIT code use LDCD too? ** ** if (__builtin_constant_p(x) && (x == NULL)) ** if (((unsigned long)p & 0xf) == 0) ** return __ldcw(p); */ #define xchg(ptr, x) \ ({ \ __typeof__(*(ptr)) __ret; \ __typeof__(*(ptr)) _x_ = (x); \ __ret = (__typeof__(*(ptr))) \ __xchg((unsigned long)_x_, (ptr), sizeof(*(ptr))); \ __ret; \ }) /* bug catcher for when unsupported size is used - won't link */ extern void __cmpxchg_called_with_bad_pointer(void); /* __cmpxchg_u32/u64 defined in arch/parisc/lib/bitops.c */ extern unsigned long __cmpxchg_u32(volatile unsigned int *m, unsigned int old, unsigned int new_); extern u64 __cmpxchg_u64(volatile u64 *ptr, u64 old, u64 new_); extern u8 __cmpxchg_u8(volatile u8 *ptr, u8 old, u8 new_); /* don't worry...optimizer will get rid of most of this */ static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new_, int size) { switch (size) { #ifdef CONFIG_64BIT case 8: return __cmpxchg_u64((u64 *)ptr, old, new_); #endif case 4: return __cmpxchg_u32((unsigned int *)ptr, (unsigned int)old, (unsigned int)new_); case 1: return __cmpxchg_u8((u8 *)ptr, old & 0xff, new_ & 0xff); } __cmpxchg_called_with_bad_pointer(); return old; } #define cmpxchg(ptr, o, n) \ ({ \ __typeof__(*(ptr)) _o_ = (o); \ __typeof__(*(ptr)) _n_ = (n); \ (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \ (unsigned long)_n_, sizeof(*(ptr))); \ }) #include <asm-generic/cmpxchg-local.h> static inline unsigned long __cmpxchg_local(volatile void *ptr, unsigned long old, unsigned long new_, int size) { switch (size) { #ifdef CONFIG_64BIT case 8: return __cmpxchg_u64((u64 *)ptr, old, new_); #endif case 4: return __cmpxchg_u32(ptr, old, new_); default: return __cmpxchg_local_generic(ptr, old, new_, size); } } /* * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make * them available. */ #define cmpxchg_local(ptr, o, n) \ ((__typeof__(*(ptr)))__cmpxchg_local((ptr), (unsigned long)(o), \ (unsigned long)(n), sizeof(*(ptr)))) #ifdef CONFIG_64BIT #define cmpxchg64_local(ptr, o, n) \ ({ \ BUILD_BUG_ON(sizeof(*(ptr)) != 8); \ cmpxchg_local((ptr), (o), (n)); \ }) #else #define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n)) #endif #define cmpxchg64(ptr, o, n) __cmpxchg_u64(ptr, o, n) #endif /* _ASM_PARISC_CMPXCHG_H_ */