Re: [PATCH v14 022/138] mm/filemap: Add __folio_lock_or_retry()
From: Vlastimil Babka <hidden>
Date: 2021-08-10 16:08:14
Also in:
linux-fsdevel, lkml
On 7/15/21 5:35 AM, Matthew Wilcox (Oracle) wrote:
Convert __lock_page_or_retry() to __folio_lock_or_retry(). This actually saves 4 bytes in the only caller of lock_page_or_retry() (due to better register allocation) and saves the 14 byte cost of calling page_folio() in __folio_lock_or_retry() for a total saving of 18 bytes. Also use a bool for the return type. 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 <redacted> Reviewed-by: William Kucharski <redacted>
Acked-by: Vlastimil Babka <redacted> Nit:
quoted hunk ↗ jump to hunk
--- a/mm/filemap.c +++ b/mm/filemap.c@@ -1625,48 +1625,46 @@ static int __folio_lock_async(struct folio *folio, struct wait_page_queue *wait) /* * Return values: - * 1 - page is locked; mmap_lock is still held. - * 0 - page is not locked. + * true - folio is locked; mmap_lock is still held. + * false - folio is not locked. * mmap_lock has been released (mmap_read_unlock(), unless flags had both * FAULT_FLAG_ALLOW_RETRY and FAULT_FLAG_RETRY_NOWAIT set, in * which case mmap_lock is still held. * * If neither ALLOW_RETRY nor KILLABLE are set, will always return 1
s/1/true/ ? :)
- * with the page locked and the mmap_lock unperturbed.
+ * with the folio locked and the mmap_lock unperturbed.
*/
-int __lock_page_or_retry(struct page *page, struct mm_struct *mm,
+bool __folio_lock_or_retry(struct folio *folio, struct mm_struct *mm,
unsigned int flags)
{
- struct folio *folio = page_folio(page);
-
if (fault_flag_allow_retry_first(flags)) {
/*
* CAUTION! In this case, mmap_lock is not released
* even though return 0.
*/
if (flags & FAULT_FLAG_RETRY_NOWAIT)
- return 0;
+ return false;
mmap_read_unlock(mm);
if (flags & FAULT_FLAG_KILLABLE)
folio_wait_locked_killable(folio);
else
folio_wait_locked(folio);
- return 0;
+ return false;
}
if (flags & FAULT_FLAG_KILLABLE) {
- int ret;
+ bool ret;
ret = __folio_lock_killable(folio);
if (ret) {
mmap_read_unlock(mm);
- return 0;
+ return false;
}
} else {
__folio_lock(folio);
}
- return 1;
+ return true;
}
/**