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mm/page_alloc: simplify page_is_buddy() for better code readability

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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>
This commit is contained in:
chenqiwu
2020-04-01 21:09:56 -07:00
committed by Linus Torvalds
parent 97ce86f93c
commit fe925c0cb0
1 changed files with 13 additions and 20 deletions
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33
mm/page_alloc.c
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@@ -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). * 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) unsigned int order)
{ {
if (page_is_guard(buddy) && page_order(buddy) == order) { if (!page_is_guard(buddy) && !PageBuddy(buddy))
if (page_zone_id(page) != page_zone_id(buddy)) return false;
return 0;
VM_BUG_ON_PAGE(page_count(buddy) != 0, buddy); if (page_order(buddy) != order)
return false;
return 1; /*
} * 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;
if (PageBuddy(buddy) && page_order(buddy) == order) { VM_BUG_ON_PAGE(page_count(buddy) != 0, buddy);
/*
* 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;
VM_BUG_ON_PAGE(page_count(buddy) != 0, buddy); return true;
return 1;
}
return 0;
} }
#ifdef CONFIG_COMPACTION #ifdef CONFIG_COMPACTION