Subject: linux-next: manual merge of the akpm-current tree with the kvms390 tree

From: Stephen Rothwell <[email-masked]>
Date: Thu, 27 Feb 2020 14:11:48 +1100

Hi all,

Today's linux-next merge of the akpm-current tree got a conflict in:

  mm/gup.c

between commit:

  732b80e677b8 ("mm/gup/writeback: add callbacks for inaccessible pages")

from the kvms390 tree and commit:

  9947ea2c1e60 ("mm/gup: track FOLL_PIN pages")

from the akpm-current tree.

I fixed it up (see below - maybe not optimally) and can carry the fix as
necessary. This is now fixed as far as linux-next is concerned, but any
non trivial conflicts should be mentioned to your upstream maintainer
when your tree is submitted for merging.  You may also want to consider
cooperating with the maintainer of the conflicting tree to minimise any
particularly complex conflicts.

-- 
Cheers,
Stephen Rothwell

diff --cc mm/gup.c
index 354bcfbd844b,f589299b0d4a..000000000000
--- a/mm/gup.c
+++ b/mm/gup.c
@@@ -269,18 -470,11 +468,19 @@@ retry
  		goto retry;
  	}
  
+ 	/* try_grab_page() does nothing unless FOLL_GET or FOLL_PIN is set. */
+ 	if (unlikely(!try_grab_page(page, flags))) {
+ 		page = ERR_PTR(-ENOMEM);
+ 		goto out;
+ 	}
 +	if (flags & FOLL_GET) {
- 		if (unlikely(!try_get_page(page))) {
- 			page = ERR_PTR(-ENOMEM);
- 			goto out;
- 		}
 +		ret = arch_make_page_accessible(page);
 +		if (ret) {
 +			put_page(page);
 +			page = ERR_PTR(ret);
 +			goto out;
 +		}
 +	}
  	if (flags & FOLL_TOUCH) {
  		if ((flags & FOLL_WRITE) &&
  		    !pte_dirty(pte) && !PageDirty(page))