forked from luck/tmp_suning_uos_patched
mm/hugetlb: use list_splice to merge two list at once
Instead of add allocated file_region one by one to region_cache, we could use list_splice to merge two list at once. Also we know the number of entries in the list, increase the number directly. Signed-off-by: Wei Yang <richard.weiyang@linux.alibaba.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Baoquan He <bhe@redhat.com> Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com> Cc: Vlastimil Babka <vbabka@suse.cz> Link: https://lkml.kernel.org/r/20200831022351.20916-4-richard.weiyang@linux.alibaba.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -443,11 +443,8 @@ static int allocate_file_region_entries(struct resv_map *resv,
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spin_lock(&resv->lock);
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list_for_each_entry_safe(rg, trg, &allocated_regions, link) {
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list_del(&rg->link);
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list_add(&rg->link, &resv->region_cache);
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resv->region_cache_count++;
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}
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list_splice(&allocated_regions, &resv->region_cache);
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resv->region_cache_count += to_allocate;
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}
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return 0;
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