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mm/filemap: Add __folio_lock_async()

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There aren't any actual callers of lock_page_async(), so remove it.
Convert filemap_update_page() to call __folio_lock_async().

__folio_lock_async() is 21 bytes smaller than __lock_page_async(),
but the real savings come from using a folio in filemap_update_page(),
shrinking it from 515 bytes to 404 bytes, saving 110 bytes.  The text
shrinks by 132 bytes in total.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Jeff Layton <jlayton@kernel.org>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
Reviewed-by: David Howells <dhowells@redhat.com>
Acked-by: Mike Rapoport <rppt@linux.ibm.com>
This commit is contained in:
Matthew Wilcox (Oracle)
2020-12-30 17:58:40 -05:00
parent af7f29d9e1
commit ffdc8dabf2
3 changed files with 15 additions and 31 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
include/linux/pagemap.h
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@@ -654,7 +654,6 @@ static inline bool wake_page_match(struct wait_page_queue *wait_page,
void __folio_lock(struct folio *folio);
int __folio_lock_killable(struct folio *folio);
extern int __lock_page_async(struct page *page, struct wait_page_queue *wait);
extern int __lock_page_or_retry(struct page *page, struct mm_struct *mm,
unsigned int flags);
void unlock_page(struct page *page);
@@ -711,22 +710,6 @@ static inline int lock_page_killable(struct page *page)
return folio_lock_killable(page_folio(page));
}
/*
* lock_page_async - Lock the page, unless this would block. If the page
* is already locked, then queue a callback when the page becomes unlocked.
* This callback can then retry the operation.
*
* Returns 0 if the page is locked successfully, or -EIOCBQUEUED if the page
* was already locked and the callback defined in 'wait' was queued.
*/
static inline int lock_page_async(struct page *page,
struct wait_page_queue *wait)
{
if (!trylock_page(page))
return __lock_page_async(page, wait);
return 0;
}
/*
* lock_page_or_retry - Lock the page, unless this would block and the
* caller indicated that it can handle a retry.