[merged mm-stable] mm-mremap_pages-save-a-few-cycles-in-get_dev_pagemap.patch removed from -mm tree

[merged mm-stable] mm-mremap_pages-save-a-few-cycles-in-get_dev_pagemap.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm/mremap_pages: save a few cycles in get_dev_pagemap()
has been removed from the -mm tree.  Its filename was
     mm-mremap_pages-save-a-few-cycles-in-get_dev_pagemap.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Subject: mm/mremap_pages: save a few cycles in get_dev_pagemap()
Date: Fri, 2 Sep 2022 18:39:52 +0200

Use 'percpu_ref_tryget_live_rcu()' instead of 'percpu_ref_tryget_live()'
to save a few cycles when it is known that the rcu lock is already
taken/released.

Link: https://lkml.kernel.org/r/9ef1562a1975371360f3e263856e9f1c5749b656.1662136782.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/memremap.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/memremap.c~mm-mremap_pages-save-a-few-cycles-in-get_dev_pagemap
+++ a/mm/memremap.c
@@ -454,7 +454,7 @@ struct dev_pagemap *get_dev_pagemap(unsi
 	/* fall back to slow path lookup */
 	rcu_read_lock();
 	pgmap = xa_load(&pgmap_array, PHYS_PFN(phys));
-	if (pgmap && !percpu_ref_tryget_live(&pgmap->ref))
+	if (pgmap && !percpu_ref_tryget_live_rcu(&pgmap->ref))
 		pgmap = NULL;
 	rcu_read_unlock();
 
_

Patches currently in -mm which might be from christophe.jaillet@wanadoo.fr are