Release 4.12 drivers/gpu/drm/i915/i915_utils.h

/*
 * 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


#undef WARN_ON
/* Many gcc seem to no see through this and fall over :( */
#if 0
#define WARN_ON(x) ({ \
        bool __i915_warn_cond = (x); \
        if (__builtin_constant_p(__i915_warn_cond)) \
                BUILD_BUG_ON(__i915_warn_cond); \
        WARN(__i915_warn_cond, "WARN_ON(" #x ")"); })
#else

#define WARN_ON(x) WARN((x), "%s", "WARN_ON(" __stringify(x) ")")
#endif


#undef WARN_ON_ONCE

#define WARN_ON_ONCE(x) WARN_ONCE((x), "%s", "WARN_ON_ONCE(" __stringify(x) ")")


#define MISSING_CASE(x) WARN(1, "Missing switch case (%lu) in %s\n", \
                             (long)(x), __func__)

#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 */
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Chris Wilson
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Michal Wajdeczko
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Directory: drivers/gpu/drm/i915

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