Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
67 lines
1.9 KiB
C
67 lines
1.9 KiB
C
/* SPDX-License-Identifier: MIT */
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/* Copyright © 2025 Intel Corporation */
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#ifndef __I915_PTR_UTIL_H__
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#define __I915_PTR_UTIL_H__
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#include <linux/types.h>
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#define ptr_mask_bits(ptr, n) ({ \
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unsigned long __v = (unsigned long)(ptr); \
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(typeof(ptr))(__v & -BIT(n)); \
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})
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#define ptr_unmask_bits(ptr, n) ((unsigned long)(ptr) & (BIT(n) - 1))
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#define ptr_unpack_bits(ptr, bits, n) ({ \
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unsigned long __v = (unsigned long)(ptr); \
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*(bits) = __v & (BIT(n) - 1); \
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(typeof(ptr))(__v & -BIT(n)); \
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})
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#define ptr_pack_bits(ptr, bits, n) ({ \
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unsigned long __bits = (bits); \
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GEM_BUG_ON(__bits & -BIT(n)); \
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((typeof(ptr))((unsigned long)(ptr) | __bits)); \
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})
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#define ptr_dec(ptr) ({ \
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unsigned long __v = (unsigned long)(ptr); \
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(typeof(ptr))(__v - 1); \
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})
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#define ptr_inc(ptr) ({ \
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unsigned long __v = (unsigned long)(ptr); \
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(typeof(ptr))(__v + 1); \
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})
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#define page_mask_bits(ptr) ptr_mask_bits(ptr, PAGE_SHIFT)
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#define page_unmask_bits(ptr) ptr_unmask_bits(ptr, PAGE_SHIFT)
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#define page_pack_bits(ptr, bits) ptr_pack_bits(ptr, bits, PAGE_SHIFT)
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#define page_unpack_bits(ptr, bits) ptr_unpack_bits(ptr, bits, PAGE_SHIFT)
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static __always_inline ptrdiff_t ptrdiff(const void *a, const void *b)
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{
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return a - b;
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}
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#define u64_to_ptr(T, x) ({ \
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typecheck(u64, x); \
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(T *)(uintptr_t)(x); \
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})
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/*
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* container_of_user: Extract the superclass from a pointer to a member.
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*
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* Exactly like container_of() with the exception that it plays nicely
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* with sparse for __user @ptr.
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*/
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#define container_of_user(ptr, type, member) ({ \
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void __user *__mptr = (void __user *)(ptr); \
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BUILD_BUG_ON_MSG(!__same_type(*(ptr), typeof_member(type, member)) && \
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!__same_type(*(ptr), void), \
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"pointer type mismatch in container_of()"); \
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((type __user *)(__mptr - offsetof(type, member))); })
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#endif /* __I915_PTR_UTIL_H__ */
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