The patch titled
Subject: mm/vmscan.c: support removing arbitrary sized pages from mapping
has been added to the -mm tree. Its filename is
mm-support-removing-arbitrary-sized-pages-from-mapping.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-support-removing-arbitrary-sized-pages-from-mapping.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-support-removing-arbitrary-sized-pages-from-mapping.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: William Kucharski <william.kucharski@xxxxxxxxxx>
Subject: mm/vmscan.c: support removing arbitrary sized pages from mapping
__remove_mapping() assumes that pages can only be either base pages or
HPAGE_PMD_SIZE. Ask the page what size it is.
Link: http://lkml.kernel.org/r/20191017164223.2762148-4-songliubraving@xxxxxx
Fixes: 99cb0dbd47a1 ("mm,thp: add read-only THP support for (non-shmem) FS")
Signed-off-by: William Kucharski <william.kucharski@xxxxxxxxxx>
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Signed-off-by: Song Liu <songliubraving@xxxxxx>
Acked-by: Yang Shi <yang.shi@xxxxxxxxxxxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Srikar Dronamraju <srikar@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmscan.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
--- a/mm/vmscan.c~mm-support-removing-arbitrary-sized-pages-from-mapping
+++ a/mm/vmscan.c
@@ -933,10 +933,7 @@ static int __remove_mapping(struct addre
* Note that if SetPageDirty is always performed via set_page_dirty,
* and thus under the i_pages lock, then this ordering is not required.
*/
- if (unlikely(PageTransHuge(page)) && PageSwapCache(page))
- refcount = 1 + HPAGE_PMD_NR;
- else
- refcount = 2;
+ refcount = 1 + compound_nr(page);
if (!page_ref_freeze(page, refcount))
goto cannot_free;
/* note: atomic_cmpxchg in page_ref_freeze provides the smp_rmb */
_
Patches currently in -mm which might be from william.kucharski@xxxxxxxxxx are
mm-support-removing-arbitrary-sized-pages-from-mapping.patch
