sbitmap: remove unnecessary calculation of alloc_hint in __sbitmap_get_shallow
Updates to alloc_hint in the loop in __sbitmap_get_shallow() are mostly pointless and equivalent to setting alloc_hint to zero (because SB_NR_TO_BIT() considers only low sb->shift bits from alloc_hint). So simplify the logic. Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com> Link: https://lore.kernel.org/r/20230116205059.3821738-2-shikemeng@huaweicloud.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -243,6 +243,7 @@ static int __sbitmap_get_shallow(struct sbitmap *sb,
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int nr = -1;
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index = SB_NR_TO_INDEX(sb, alloc_hint);
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alloc_hint = SB_NR_TO_BIT(sb, alloc_hint);
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for (i = 0; i < sb->map_nr; i++) {
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again:
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@ -250,7 +251,7 @@ again:
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min_t(unsigned int,
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__map_depth(sb, index),
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shallow_depth),
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SB_NR_TO_BIT(sb, alloc_hint), true);
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alloc_hint, true);
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if (nr != -1) {
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nr += index << sb->shift;
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break;
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@ -260,13 +261,9 @@ again:
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goto again;
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/* Jump to next index. */
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index++;
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alloc_hint = index << sb->shift;
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if (index >= sb->map_nr) {
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index = 0;
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alloc_hint = 0;
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}
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if (++index >= sb->map_nr)
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index = 0;
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}
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return nr;
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