mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-21 01:51:18 +00:00
5cfd69775e
It's no longer legal to use a zero size array as a flexible array member - this causes UBSAN to complain. This patch switches our zero size arrays to normal flexible array members when possible, and inserts casts in other places (e.g. where we use the zero size array as a marker partway through an array). Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
63 lines
2 KiB
C
63 lines
2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _VSTRUCTS_H
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#define _VSTRUCTS_H
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#include "util.h"
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/*
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* NOTE: we can't differentiate between __le64 and u64 with type_is - this
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* assumes u64 is little endian:
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*/
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#define __vstruct_u64s(_s) \
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({ \
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( type_is((_s)->u64s, u64) ? le64_to_cpu((__force __le64) (_s)->u64s) \
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: type_is((_s)->u64s, u32) ? le32_to_cpu((__force __le32) (_s)->u64s) \
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: type_is((_s)->u64s, u16) ? le16_to_cpu((__force __le16) (_s)->u64s) \
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: ((__force u8) ((_s)->u64s))); \
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})
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#define __vstruct_bytes(_type, _u64s) \
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({ \
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BUILD_BUG_ON(offsetof(_type, _data) % sizeof(u64)); \
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\
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(size_t) (offsetof(_type, _data) + (_u64s) * sizeof(u64)); \
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})
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#define vstruct_bytes(_s) \
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__vstruct_bytes(typeof(*(_s)), __vstruct_u64s(_s))
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#define __vstruct_blocks(_type, _sector_block_bits, _u64s) \
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(round_up(__vstruct_bytes(_type, _u64s), \
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512 << (_sector_block_bits)) >> (9 + (_sector_block_bits)))
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#define vstruct_blocks(_s, _sector_block_bits) \
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__vstruct_blocks(typeof(*(_s)), _sector_block_bits, __vstruct_u64s(_s))
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#define vstruct_blocks_plus(_s, _sector_block_bits, _u64s) \
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__vstruct_blocks(typeof(*(_s)), _sector_block_bits, \
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__vstruct_u64s(_s) + (_u64s))
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#define vstruct_sectors(_s, _sector_block_bits) \
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(round_up(vstruct_bytes(_s), 512 << (_sector_block_bits)) >> 9)
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#define vstruct_next(_s) \
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((typeof(_s)) ((u64 *) (_s)->_data + __vstruct_u64s(_s)))
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#define vstruct_last(_s) \
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((typeof(&(_s)->start[0])) ((u64 *) (_s)->_data + __vstruct_u64s(_s)))
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#define vstruct_end(_s) \
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((void *) ((u64 *) (_s)->_data + __vstruct_u64s(_s)))
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#define vstruct_for_each(_s, _i) \
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for (_i = (_s)->start; \
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_i < vstruct_last(_s); \
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_i = vstruct_next(_i))
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#define vstruct_for_each_safe(_s, _i, _t) \
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for (_i = (_s)->start; \
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_i < vstruct_last(_s) && (_t = vstruct_next(_i), true); \
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_i = _t)
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#define vstruct_idx(_s, _idx) \
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((typeof(&(_s)->start[0])) ((_s)->_data + (_idx)))
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#endif /* _VSTRUCTS_H */
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