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![Linus Torvalds](/assets/img/avatar_default.png)
Hi Linus, Please pull patches for 6.10. This includes: - topology_span_sane() optimization from Kyle Meyer; - fns() rework from Kuan-Wei Chiu (used in cpumask_local_spread() and other places); and - headers cleanup from Andy. This also adds a MAINTAINERS record for bitops API as it's unattended, and I'd like to follow it closer. Thanks, Yury -----BEGIN PGP SIGNATURE----- iQGzBAABCgAdFiEEi8GdvG6xMhdgpu/4sUSA/TofvsgFAmZKh/kACgkQsUSA/Tof vshtSQv/eT5+KyXg5qCY3fLaIjWYD0uch5jxkdqtib5BncfIrUMsFpZBon+E2x9C fWu7K/nfxUjKZF0Sfgl9gVns6K0rC4F24WzHjzWRVVV7+g4idXwMC1kxSX733KQC o+D2065Dx9EmhnzypBbmNsGQsQ09WXP1GsJLf8qSGCw0lT1zNtgqsAD5sSogFGGn ca9ZsndThuzTst5lXPXipt1W/c26frchh6SgjVTPjzALCDAf5r9Ls5np3AL1AW8X yR8cuV9UphT1ysBplzPbBET/Fy/AGbZl1g4u72M6NvGy/nVkQ5Ic4HZj0zIem0Ic C60PokY8lg6hQ7tWN8da12/g6WZINgZcfUfuodKiQAzryBGUJlW0aDzDUZPcCqB/ gmV/Op4RPJeQr9sibQ6nIFx73ydKVQEmZRliahzXR0p33HJCOLTATOeYqLTXQMdi ZwhYCqG5fNEUK0VMBy8S4+tEsUAoykU21hFD04b/Ur8A49bxxJ9RDlAUC0IEc1Pj fiU0VPFx =H6BQ -----END PGP SIGNATURE----- Merge tag 'bitmap-for-6.10v2' of https://github.com/norov/linux Pull bitmap updates from Yury Norov: - topology_span_sane() optimization from Kyle Meyer - fns() rework from Kuan-Wei Chiu (used in cpumask_local_spread() and other places) - headers cleanup from Andy - add a MAINTAINERS record for bitops API * tag 'bitmap-for-6.10v2' of https://github.com/norov/linux: usercopy: Don't use "proxy" headers bitops: Move aligned_byte_mask() to wordpart.h MAINTAINERS: add BITOPS API record bitmap: relax find_nth_bit() limitation on return value lib: make test_bitops compilable into the kernel image bitops: Optimize fns() for improved performance lib/test_bitops: Add benchmark test for fns() Compiler Attributes: Add __always_used macro sched/topology: Optimize topology_span_sane() cpumask: Add for_each_cpu_from()
283 lines
7.5 KiB
C
283 lines
7.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* bit search implementation
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*
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* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* Copyright (C) 2008 IBM Corporation
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* 'find_last_bit' is written by Rusty Russell <rusty@rustcorp.com.au>
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* (Inspired by David Howell's find_next_bit implementation)
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*
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* Rewritten by Yury Norov <yury.norov@gmail.com> to decrease
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* size and improve performance, 2015.
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*/
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#include <linux/bitops.h>
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#include <linux/bitmap.h>
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#include <linux/export.h>
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#include <linux/math.h>
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#include <linux/minmax.h>
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#include <linux/swab.h>
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/*
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* Common helper for find_bit() function family
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* @FETCH: The expression that fetches and pre-processes each word of bitmap(s)
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* @MUNGE: The expression that post-processes a word containing found bit (may be empty)
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* @size: The bitmap size in bits
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*/
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#define FIND_FIRST_BIT(FETCH, MUNGE, size) \
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({ \
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unsigned long idx, val, sz = (size); \
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\
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for (idx = 0; idx * BITS_PER_LONG < sz; idx++) { \
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val = (FETCH); \
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if (val) { \
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sz = min(idx * BITS_PER_LONG + __ffs(MUNGE(val)), sz); \
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break; \
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} \
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} \
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\
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sz; \
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})
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/*
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* Common helper for find_next_bit() function family
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* @FETCH: The expression that fetches and pre-processes each word of bitmap(s)
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* @MUNGE: The expression that post-processes a word containing found bit (may be empty)
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* @size: The bitmap size in bits
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* @start: The bitnumber to start searching at
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*/
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#define FIND_NEXT_BIT(FETCH, MUNGE, size, start) \
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({ \
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unsigned long mask, idx, tmp, sz = (size), __start = (start); \
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\
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if (unlikely(__start >= sz)) \
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goto out; \
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\
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mask = MUNGE(BITMAP_FIRST_WORD_MASK(__start)); \
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idx = __start / BITS_PER_LONG; \
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\
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for (tmp = (FETCH) & mask; !tmp; tmp = (FETCH)) { \
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if ((idx + 1) * BITS_PER_LONG >= sz) \
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goto out; \
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idx++; \
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} \
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\
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sz = min(idx * BITS_PER_LONG + __ffs(MUNGE(tmp)), sz); \
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out: \
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sz; \
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})
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#define FIND_NTH_BIT(FETCH, size, num) \
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({ \
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unsigned long sz = (size), nr = (num), idx, w, tmp; \
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\
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for (idx = 0; (idx + 1) * BITS_PER_LONG <= sz; idx++) { \
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if (idx * BITS_PER_LONG + nr >= sz) \
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goto out; \
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\
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tmp = (FETCH); \
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w = hweight_long(tmp); \
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if (w > nr) \
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goto found; \
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\
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nr -= w; \
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} \
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\
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if (sz % BITS_PER_LONG) \
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tmp = (FETCH) & BITMAP_LAST_WORD_MASK(sz); \
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found: \
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sz = idx * BITS_PER_LONG + fns(tmp, nr); \
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out: \
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sz; \
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})
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#ifndef find_first_bit
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/*
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* Find the first set bit in a memory region.
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*/
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unsigned long _find_first_bit(const unsigned long *addr, unsigned long size)
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{
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return FIND_FIRST_BIT(addr[idx], /* nop */, size);
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}
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EXPORT_SYMBOL(_find_first_bit);
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#endif
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#ifndef find_first_and_bit
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/*
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* Find the first set bit in two memory regions.
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*/
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unsigned long _find_first_and_bit(const unsigned long *addr1,
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const unsigned long *addr2,
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unsigned long size)
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{
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return FIND_FIRST_BIT(addr1[idx] & addr2[idx], /* nop */, size);
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}
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EXPORT_SYMBOL(_find_first_and_bit);
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#endif
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/*
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* Find the first set bit in three memory regions.
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*/
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unsigned long _find_first_and_and_bit(const unsigned long *addr1,
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const unsigned long *addr2,
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const unsigned long *addr3,
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unsigned long size)
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{
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return FIND_FIRST_BIT(addr1[idx] & addr2[idx] & addr3[idx], /* nop */, size);
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}
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EXPORT_SYMBOL(_find_first_and_and_bit);
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#ifndef find_first_zero_bit
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/*
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* Find the first cleared bit in a memory region.
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*/
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unsigned long _find_first_zero_bit(const unsigned long *addr, unsigned long size)
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{
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return FIND_FIRST_BIT(~addr[idx], /* nop */, size);
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}
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EXPORT_SYMBOL(_find_first_zero_bit);
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#endif
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#ifndef find_next_bit
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unsigned long _find_next_bit(const unsigned long *addr, unsigned long nbits, unsigned long start)
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{
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return FIND_NEXT_BIT(addr[idx], /* nop */, nbits, start);
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}
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EXPORT_SYMBOL(_find_next_bit);
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#endif
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unsigned long __find_nth_bit(const unsigned long *addr, unsigned long size, unsigned long n)
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{
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return FIND_NTH_BIT(addr[idx], size, n);
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}
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EXPORT_SYMBOL(__find_nth_bit);
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unsigned long __find_nth_and_bit(const unsigned long *addr1, const unsigned long *addr2,
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unsigned long size, unsigned long n)
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{
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return FIND_NTH_BIT(addr1[idx] & addr2[idx], size, n);
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}
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EXPORT_SYMBOL(__find_nth_and_bit);
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unsigned long __find_nth_andnot_bit(const unsigned long *addr1, const unsigned long *addr2,
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unsigned long size, unsigned long n)
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{
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return FIND_NTH_BIT(addr1[idx] & ~addr2[idx], size, n);
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}
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EXPORT_SYMBOL(__find_nth_andnot_bit);
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unsigned long __find_nth_and_andnot_bit(const unsigned long *addr1,
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const unsigned long *addr2,
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const unsigned long *addr3,
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unsigned long size, unsigned long n)
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{
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return FIND_NTH_BIT(addr1[idx] & addr2[idx] & ~addr3[idx], size, n);
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}
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EXPORT_SYMBOL(__find_nth_and_andnot_bit);
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#ifndef find_next_and_bit
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unsigned long _find_next_and_bit(const unsigned long *addr1, const unsigned long *addr2,
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unsigned long nbits, unsigned long start)
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{
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return FIND_NEXT_BIT(addr1[idx] & addr2[idx], /* nop */, nbits, start);
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}
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EXPORT_SYMBOL(_find_next_and_bit);
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#endif
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#ifndef find_next_andnot_bit
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unsigned long _find_next_andnot_bit(const unsigned long *addr1, const unsigned long *addr2,
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unsigned long nbits, unsigned long start)
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{
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return FIND_NEXT_BIT(addr1[idx] & ~addr2[idx], /* nop */, nbits, start);
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}
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EXPORT_SYMBOL(_find_next_andnot_bit);
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#endif
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#ifndef find_next_or_bit
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unsigned long _find_next_or_bit(const unsigned long *addr1, const unsigned long *addr2,
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unsigned long nbits, unsigned long start)
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{
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return FIND_NEXT_BIT(addr1[idx] | addr2[idx], /* nop */, nbits, start);
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}
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EXPORT_SYMBOL(_find_next_or_bit);
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#endif
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#ifndef find_next_zero_bit
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unsigned long _find_next_zero_bit(const unsigned long *addr, unsigned long nbits,
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unsigned long start)
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{
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return FIND_NEXT_BIT(~addr[idx], /* nop */, nbits, start);
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}
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EXPORT_SYMBOL(_find_next_zero_bit);
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#endif
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#ifndef find_last_bit
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unsigned long _find_last_bit(const unsigned long *addr, unsigned long size)
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{
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if (size) {
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unsigned long val = BITMAP_LAST_WORD_MASK(size);
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unsigned long idx = (size-1) / BITS_PER_LONG;
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do {
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val &= addr[idx];
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if (val)
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return idx * BITS_PER_LONG + __fls(val);
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val = ~0ul;
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} while (idx--);
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}
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return size;
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}
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EXPORT_SYMBOL(_find_last_bit);
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#endif
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unsigned long find_next_clump8(unsigned long *clump, const unsigned long *addr,
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unsigned long size, unsigned long offset)
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{
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offset = find_next_bit(addr, size, offset);
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if (offset == size)
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return size;
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offset = round_down(offset, 8);
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*clump = bitmap_get_value8(addr, offset);
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return offset;
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}
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EXPORT_SYMBOL(find_next_clump8);
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#ifdef __BIG_ENDIAN
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#ifndef find_first_zero_bit_le
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/*
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* Find the first cleared bit in an LE memory region.
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*/
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unsigned long _find_first_zero_bit_le(const unsigned long *addr, unsigned long size)
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{
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return FIND_FIRST_BIT(~addr[idx], swab, size);
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}
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EXPORT_SYMBOL(_find_first_zero_bit_le);
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#endif
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#ifndef find_next_zero_bit_le
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unsigned long _find_next_zero_bit_le(const unsigned long *addr,
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unsigned long size, unsigned long offset)
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{
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return FIND_NEXT_BIT(~addr[idx], swab, size, offset);
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}
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EXPORT_SYMBOL(_find_next_zero_bit_le);
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#endif
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#ifndef find_next_bit_le
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unsigned long _find_next_bit_le(const unsigned long *addr,
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unsigned long size, unsigned long offset)
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{
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return FIND_NEXT_BIT(addr[idx], swab, size, offset);
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}
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EXPORT_SYMBOL(_find_next_bit_le);
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#endif
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#endif /* __BIG_ENDIAN */
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