lkml.org 
[lkml]   [2021]   [Apr]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 6/6] mm: Constify page_count and page_ref_count
Date
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>
---
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
\
 
 \ /
  Last update: 2021-04-17 01:19    [W:0.105 / U:1.200 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site