Messages in this thread Patch in this message | | | From | Christophe JAILLET <> | Subject | [PATCH] mm/mremap_pages: Save a few cycles in 'get_dev_pagemap()' | Date | Wed, 3 Nov 2021 22:35:34 +0100 |
| |
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.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> --- mm/memremap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/memremap.c b/mm/memremap.c index 84de22c14567..012e8d23d365 100644 --- a/mm/memremap.c +++ b/mm/memremap.c @@ -506,7 +506,7 @@ struct dev_pagemap *get_dev_pagemap(unsigned long pfn, /* 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(); -- 2.30.2
| |