mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-21 15:48:56 +07:00
16f11f4696
Manual pointer manipulation is error prone. Let compiler calculate right offsets for us in case we need to change ads layout. v2: don't call it object (Chris) v3: restyle offset assignments (Chris) v4: stylistic reductions Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com> Cc: Oscar Mateo <oscar.mateo@intel.com> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Link: http://patchwork.freedesktop.org/patch/msgid/20170314133309.126432-1-michal.wajdeczko@intel.com Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
78 lines
2.5 KiB
C
78 lines
2.5 KiB
C
/*
|
|
* Copyright © 2016 Intel Corporation
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a
|
|
* copy of this software and associated documentation files (the "Software"),
|
|
* to deal in the Software without restriction, including without limitation
|
|
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
|
* and/or sell copies of the Software, and to permit persons to whom the
|
|
* Software is furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice (including the next
|
|
* paragraph) shall be included in all copies or substantial portions of the
|
|
* Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
|
|
* IN THE SOFTWARE.
|
|
*
|
|
*/
|
|
|
|
#ifndef __I915_UTILS_H
|
|
#define __I915_UTILS_H
|
|
|
|
#if GCC_VERSION >= 70000
|
|
#define add_overflows(A, B) \
|
|
__builtin_add_overflow_p((A), (B), (typeof((A) + (B)))0)
|
|
#else
|
|
#define add_overflows(A, B) ({ \
|
|
typeof(A) a = (A); \
|
|
typeof(B) b = (B); \
|
|
a + b < a; \
|
|
})
|
|
#endif
|
|
|
|
#define range_overflows(start, size, max) ({ \
|
|
typeof(start) start__ = (start); \
|
|
typeof(size) size__ = (size); \
|
|
typeof(max) max__ = (max); \
|
|
(void)(&start__ == &size__); \
|
|
(void)(&start__ == &max__); \
|
|
start__ > max__ || size__ > max__ - start__; \
|
|
})
|
|
|
|
#define range_overflows_t(type, start, size, max) \
|
|
range_overflows((type)(start), (type)(size), (type)(max))
|
|
|
|
/* Note we don't consider signbits :| */
|
|
#define overflows_type(x, T) \
|
|
(sizeof(x) > sizeof(T) && (x) >> (sizeof(T) * BITS_PER_BYTE))
|
|
|
|
#define ptr_mask_bits(ptr) ({ \
|
|
unsigned long __v = (unsigned long)(ptr); \
|
|
(typeof(ptr))(__v & PAGE_MASK); \
|
|
})
|
|
|
|
#define ptr_unpack_bits(ptr, bits) ({ \
|
|
unsigned long __v = (unsigned long)(ptr); \
|
|
(bits) = __v & ~PAGE_MASK; \
|
|
(typeof(ptr))(__v & PAGE_MASK); \
|
|
})
|
|
|
|
#define ptr_pack_bits(ptr, bits) \
|
|
((typeof(ptr))((unsigned long)(ptr) | (bits)))
|
|
|
|
#define ptr_offset(ptr, member) offsetof(typeof(*(ptr)), member)
|
|
|
|
#define fetch_and_zero(ptr) ({ \
|
|
typeof(*ptr) __T = *(ptr); \
|
|
*(ptr) = (typeof(*ptr))0; \
|
|
__T; \
|
|
})
|
|
|
|
#endif /* !__I915_UTILS_H */
|