mirror of
https://github.com/torvalds/linux.git
synced 2025-11-02 01:29:02 +02:00
a394f12a4d
Move pointer related utilities from i915_utils.h to a separate new i915_ptr_util.h header. Clean up related includes. Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com> Link: https://lore.kernel.org/r/3cd06aa2483e68f19401292e9d4c28bf2977fce5.1757582214.git.jani.nikula@intel.com Signed-off-by: Jani Nikula <jani.nikula@intel.com>
66 lines
1.9 KiB
C
66 lines
1.9 KiB
C
/* SPDX-License-Identifier: MIT */
|
|
/* Copyright © 2025 Intel Corporation */
|
|
|
|
#ifndef __I915_PTR_UTIL_H__
|
|
#define __I915_PTR_UTIL_H__
|
|
|
|
#include <linux/types.h>
|
|
|
|
#define ptr_mask_bits(ptr, n) ({ \
|
|
unsigned long __v = (unsigned long)(ptr); \
|
|
(typeof(ptr))(__v & -BIT(n)); \
|
|
})
|
|
|
|
#define ptr_unmask_bits(ptr, n) ((unsigned long)(ptr) & (BIT(n) - 1))
|
|
|
|
#define ptr_unpack_bits(ptr, bits, n) ({ \
|
|
unsigned long __v = (unsigned long)(ptr); \
|
|
*(bits) = __v & (BIT(n) - 1); \
|
|
(typeof(ptr))(__v & -BIT(n)); \
|
|
})
|
|
|
|
#define ptr_pack_bits(ptr, bits, n) ({ \
|
|
unsigned long __bits = (bits); \
|
|
GEM_BUG_ON(__bits & -BIT(n)); \
|
|
((typeof(ptr))((unsigned long)(ptr) | __bits)); \
|
|
})
|
|
|
|
#define ptr_dec(ptr) ({ \
|
|
unsigned long __v = (unsigned long)(ptr); \
|
|
(typeof(ptr))(__v - 1); \
|
|
})
|
|
|
|
#define ptr_inc(ptr) ({ \
|
|
unsigned long __v = (unsigned long)(ptr); \
|
|
(typeof(ptr))(__v + 1); \
|
|
})
|
|
|
|
#define page_mask_bits(ptr) ptr_mask_bits(ptr, PAGE_SHIFT)
|
|
#define page_unmask_bits(ptr) ptr_unmask_bits(ptr, PAGE_SHIFT)
|
|
#define page_pack_bits(ptr, bits) ptr_pack_bits(ptr, bits, PAGE_SHIFT)
|
|
#define page_unpack_bits(ptr, bits) ptr_unpack_bits(ptr, bits, PAGE_SHIFT)
|
|
|
|
static __always_inline ptrdiff_t ptrdiff(const void *a, const void *b)
|
|
{
|
|
return a - b;
|
|
}
|
|
|
|
#define u64_to_ptr(T, x) ({ \
|
|
typecheck(u64, x); \
|
|
(T *)(uintptr_t)(x); \
|
|
})
|
|
|
|
/*
|
|
* container_of_user: Extract the superclass from a pointer to a member.
|
|
*
|
|
* Exactly like container_of() with the exception that it plays nicely
|
|
* with sparse for __user @ptr.
|
|
*/
|
|
#define container_of_user(ptr, type, member) ({ \
|
|
void __user *__mptr = (void __user *)(ptr); \
|
|
BUILD_BUG_ON_MSG(!__same_type(*(ptr), typeof_member(type, member)) && \
|
|
!__same_type(*(ptr), void), \
|
|
"pointer type mismatch in container_of()"); \
|
|
((type __user *)(__mptr - offsetof(type, member))); })
|
|
|
|
#endif /* __I915_PTR_UTIL_H__ */
|