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From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
To: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
	akpm@linux-foundation.org
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>,
	William Kucharski <william.kucharski@oracle.com>,
	Vlastimil Babka <vbabka@suse.cz>,
	Anshuman Khandual <anshuman.khandual@arm.com>
Subject: [PATCH 7/8] mm: Constify page_count and page_ref_count
Date: Fri, 30 Apr 2021 15:55:48 +0100
Message-ID: <20210430145549.2662354-8-willy@infradead.org> (raw)
In-Reply-To: <20210430145549.2662354-1-willy@infradead.org>

Now that compound_head() accepts a const struct page pointer, these two
functions can be marked as not modifying the page pointer they are passed.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
 include/linux/page_ref.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/page_ref.h b/include/linux/page_ref.h
index f3318f34fc54..7ad46f45df39 100644
--- a/include/linux/page_ref.h
+++ b/include/linux/page_ref.h
@@ -62,12 +62,12 @@ static inline void __page_ref_unfreeze(struct page *page, int v)
 
 #endif
 
-static inline int page_ref_count(struct page *page)
+static inline int page_ref_count(const struct page *page)
 {
 	return atomic_read(&page->_refcount);
 }
 
-static inline int page_count(struct page *page)
+static inline int page_count(const struct page *page)
 {
 	return atomic_read(&compound_head(page)->_refcount);
 }
-- 
2.30.2


  parent reply index

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-30 14:55 [PATCH 0/8] Folio Prequel patches Matthew Wilcox (Oracle)
2021-04-30 14:55 ` [PATCH 1/8] mm: Optimise nth_page for contiguous memmap Matthew Wilcox (Oracle)
2021-04-30 14:55 ` [PATCH 2/8] mm: Make __dump_page static Matthew Wilcox (Oracle)
2021-04-30 14:55 ` [PATCH 3/8] mm/debug: Factor PagePoisoned out of __dump_page Matthew Wilcox (Oracle)
2021-05-12  3:29   ` Kefeng Wang
2021-05-12  3:38     ` Matthew Wilcox
2021-05-12  3:53       ` Kefeng Wang
2021-04-30 14:55 ` [PATCH 4/8] mm/page_owner: Constify dump_page_owner Matthew Wilcox (Oracle)
2021-04-30 14:55 ` [PATCH 5/8] mm: Make compound_head const-preserving Matthew Wilcox (Oracle)
2021-04-30 14:55 ` [PATCH 6/8] mm: Constify get_pfnblock_flags_mask and get_pfnblock_migratetype Matthew Wilcox (Oracle)
2021-04-30 14:55 ` Matthew Wilcox (Oracle) [this message]
2021-04-30 14:55 ` [PATCH 8/8] mm: Fix struct page layout on 32-bit systems Matthew Wilcox (Oracle)
2021-05-10 16:12 ` [PATCH 0/8] Folio Prequel patches Matteo Croce
2021-05-10 16:29   ` Matthew Wilcox

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