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mm: rename _count, field of the struct page, to _refcount

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Many developers already know that field for reference count of the
struct page is _count and atomic type.  They would try to handle it
directly and this could break the purpose of page reference count
tracepoint.  To prevent direct _count modification, this patch rename it
to _refcount and add warning message on the code.  After that, developer
who need to handle reference count will find that field should not be
accessed directly.

[[email protected]: fix comments, per Vlastimil]
[[email protected]: Documentation/vm/transhuge.txt too]
[[email protected]: sync ethernet driver changes]
Signed-off-by: Joonsoo Kim <[email protected]>
Signed-off-by: Stephen Rothwell <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Johannes Berg <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Sunil Goutham <[email protected]>
Cc: Chris Metcalf <[email protected]>
Cc: Manish Chopra <[email protected]>
Cc: Yuval Mintz <[email protected]>
Cc: Tariq Toukan <[email protected]>
Cc: Saeed Mahameed <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Joonsoo Kim 2016-05-19 17:10:49 -07:00 • committed by Linus Torvalds
commit 0139aa7b7f
17 changed files with 58 additions and 54 deletions
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2
mm/internal.h
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@ -58,7 +58,7 @@ static inline unsigned long ra_submit(struct file_ra_state *ra,
}
/*
* Turn a non-refcounted page (->_count == 0) into refcounted with
* Turn a non-refcounted page (->_refcount == 0) into refcounted with
* a count of one.
*/
static inline void set_page_refcounted(struct page *page)