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Many user space API headers are missing licensing information, which makes it hard for compliance tools to determine the correct license. By default are files without license information under the default license of the kernel, which is GPLV2. Marking them GPLV2 would exclude them from being included in non GPLV2 code, which is obviously not intended. The user space API headers fall under the syscall exception which is in the kernels COPYING file: NOTE! This copyright does *not* cover user programs that use kernel services by normal system calls - this is merely considered normal use of the kernel, and does *not* fall under the heading of "derived work". otherwise syscall usage would not be possible. Update the files which contain no license information with an SPDX license identifier. The chosen identifier is 'GPL-2.0 WITH Linux-syscall-note' which is the officially assigned identifier for the Linux syscall exception. SPDX license identifiers are a legally binding shorthand, which can be used instead of the full boiler plate text. This patch is based on work done by Thomas Gleixner and Kate Stewart and Philippe Ombredanne. See the previous patch in this series for the methodology of how this patch was researched. Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
156 lines
4.1 KiB
C
156 lines
4.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _ASM_IA64_CMPXCHG_H
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#define _ASM_IA64_CMPXCHG_H
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/*
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* Compare/Exchange, forked from asm/intrinsics.h
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* which was:
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*
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* Copyright (C) 2002-2003 Hewlett-Packard Co
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* David Mosberger-Tang <davidm@hpl.hp.com>
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*/
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#ifndef __ASSEMBLY__
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#include <linux/types.h>
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/* include compiler specific intrinsics */
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#include <asm/ia64regs.h>
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#ifdef __INTEL_COMPILER
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# include <asm/intel_intrin.h>
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#else
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# include <asm/gcc_intrin.h>
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#endif
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/*
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* This function doesn't exist, so you'll get a linker error if
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* something tries to do an invalid xchg().
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*/
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extern void ia64_xchg_called_with_bad_pointer(void);
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#define __xchg(x, ptr, size) \
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({ \
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unsigned long __xchg_result; \
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\
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switch (size) { \
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case 1: \
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__xchg_result = ia64_xchg1((__u8 *)ptr, x); \
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break; \
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\
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case 2: \
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__xchg_result = ia64_xchg2((__u16 *)ptr, x); \
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break; \
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\
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case 4: \
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__xchg_result = ia64_xchg4((__u32 *)ptr, x); \
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break; \
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\
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case 8: \
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__xchg_result = ia64_xchg8((__u64 *)ptr, x); \
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break; \
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default: \
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ia64_xchg_called_with_bad_pointer(); \
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} \
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__xchg_result; \
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})
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#define xchg(ptr, x) \
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((__typeof__(*(ptr))) __xchg((unsigned long) (x), (ptr), sizeof(*(ptr))))
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/*
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* Atomic compare and exchange. Compare OLD with MEM, if identical,
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* store NEW in MEM. Return the initial value in MEM. Success is
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* indicated by comparing RETURN with OLD.
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*/
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/*
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* This function doesn't exist, so you'll get a linker error
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* if something tries to do an invalid cmpxchg().
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*/
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extern long ia64_cmpxchg_called_with_bad_pointer(void);
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#define ia64_cmpxchg(sem, ptr, old, new, size) \
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({ \
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__u64 _o_, _r_; \
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\
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switch (size) { \
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case 1: \
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_o_ = (__u8) (long) (old); \
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break; \
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case 2: \
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_o_ = (__u16) (long) (old); \
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break; \
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case 4: \
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_o_ = (__u32) (long) (old); \
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break; \
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case 8: \
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_o_ = (__u64) (long) (old); \
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break; \
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default: \
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break; \
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} \
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switch (size) { \
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case 1: \
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_r_ = ia64_cmpxchg1_##sem((__u8 *) ptr, new, _o_); \
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break; \
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\
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case 2: \
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_r_ = ia64_cmpxchg2_##sem((__u16 *) ptr, new, _o_); \
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break; \
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\
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case 4: \
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_r_ = ia64_cmpxchg4_##sem((__u32 *) ptr, new, _o_); \
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break; \
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\
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case 8: \
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_r_ = ia64_cmpxchg8_##sem((__u64 *) ptr, new, _o_); \
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break; \
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\
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default: \
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_r_ = ia64_cmpxchg_called_with_bad_pointer(); \
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break; \
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} \
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(__typeof__(old)) _r_; \
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})
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#define cmpxchg_acq(ptr, o, n) \
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ia64_cmpxchg(acq, (ptr), (o), (n), sizeof(*(ptr)))
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#define cmpxchg_rel(ptr, o, n) \
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ia64_cmpxchg(rel, (ptr), (o), (n), sizeof(*(ptr)))
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/*
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* Worse still - early processor implementations actually just ignored
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* the acquire/release and did a full fence all the time. Unfortunately
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* this meant a lot of badly written code that used .acq when they really
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* wanted .rel became legacy out in the wild - so when we made a cpu
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* that strictly did the .acq or .rel ... all that code started breaking - so
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* we had to back-pedal and keep the "legacy" behavior of a full fence :-(
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*/
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/* for compatibility with other platforms: */
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#define cmpxchg(ptr, o, n) cmpxchg_acq((ptr), (o), (n))
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#define cmpxchg64(ptr, o, n) cmpxchg_acq((ptr), (o), (n))
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#define cmpxchg_local cmpxchg
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#define cmpxchg64_local cmpxchg64
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#ifdef CONFIG_IA64_DEBUG_CMPXCHG
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# define CMPXCHG_BUGCHECK_DECL int _cmpxchg_bugcheck_count = 128;
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# define CMPXCHG_BUGCHECK(v) \
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do { \
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if (_cmpxchg_bugcheck_count-- <= 0) { \
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void *ip; \
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extern int printk(const char *fmt, ...); \
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ip = (void *) ia64_getreg(_IA64_REG_IP); \
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printk("CMPXCHG_BUGCHECK: stuck at %p on word %p\n", ip, (v));\
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break; \
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} \
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} while (0)
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#else /* !CONFIG_IA64_DEBUG_CMPXCHG */
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# define CMPXCHG_BUGCHECK_DECL
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# define CMPXCHG_BUGCHECK(v)
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#endif /* !CONFIG_IA64_DEBUG_CMPXCHG */
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#endif /* !__ASSEMBLY__ */
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#endif /* _ASM_IA64_CMPXCHG_H */
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