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| author | chenqiwu <chenqiwu@xiaomi.com> | 2020-04-01 21:09:56 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-04-02 09:35:31 -0700 |
| commit | fe925c0cb05b5616353e8b68eb914c9840cad2f9 (patch) | |
| tree | 4308ba84a8fb912a6b7222c461563f8c8f27ae35 /mm/page_alloc.c | |
| parent | 97ce86f93cf3f885063d919499903d08aa390942 (diff) | |
| download | lwn-fe925c0cb05b5616353e8b68eb914c9840cad2f9.tar.gz lwn-fe925c0cb05b5616353e8b68eb914c9840cad2f9.zip | |
mm/page_alloc: simplify page_is_buddy() for better code readability
Simplify page_is_buddy() to reduce the redundant code for better code
readability.
Signed-off-by: chenqiwu <chenqiwu@xiaomi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Alexander Duyck <alexander.h.duyck@linux.intel.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Link: http://lkml.kernel.org/r/1583853751-5525-1-git-send-email-qiwuchen55@gmail.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_alloc.c')
| -rw-r--r-- | mm/page_alloc.c | 33 |
1 files changed, 13 insertions, 20 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 43a405c4c16e..c494bf275166 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -792,32 +792,25 @@ static inline void set_page_order(struct page *page, unsigned int order) * * For recording page's order, we use page_private(page). */ -static inline int page_is_buddy(struct page *page, struct page *buddy, +static inline bool page_is_buddy(struct page *page, struct page *buddy, unsigned int order) { - if (page_is_guard(buddy) && page_order(buddy) == order) { - if (page_zone_id(page) != page_zone_id(buddy)) - return 0; - - VM_BUG_ON_PAGE(page_count(buddy) != 0, buddy); + if (!page_is_guard(buddy) && !PageBuddy(buddy)) + return false; - return 1; - } + if (page_order(buddy) != order) + return false; - if (PageBuddy(buddy) && page_order(buddy) == order) { - /* - * zone check is done late to avoid uselessly - * calculating zone/node ids for pages that could - * never merge. - */ - if (page_zone_id(page) != page_zone_id(buddy)) - return 0; + /* + * zone check is done late to avoid uselessly calculating + * zone/node ids for pages that could never merge. + */ + if (page_zone_id(page) != page_zone_id(buddy)) + return false; - VM_BUG_ON_PAGE(page_count(buddy) != 0, buddy); + VM_BUG_ON_PAGE(page_count(buddy) != 0, buddy); - return 1; - } - return 0; + return true; } #ifdef CONFIG_COMPACTION |