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| author | Christophe JAILLET <christophe.jaillet@wanadoo.fr> | 2022-09-02 18:39:52 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-09-11 20:26:11 -0700 |
| commit | e7b72c48d677c244aae5aee1a72bc57b84fd495c (patch) | |
| tree | 025c3c2d45b68118deca13d0210b4b7e662d5325 /mm/memremap.c | |
| parent | 9a157dd8fe5ac32304eff8a7722e30352acaa7f0 (diff) | |
| download | linux-e7b72c48d677c244aae5aee1a72bc57b84fd495c.tar.bz2 | |
mm/mremap_pages: save a few cycles in get_dev_pagemap()
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>
Diffstat (limited to 'mm/memremap.c')
| -rw-r--r-- | mm/memremap.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/memremap.c b/mm/memremap.c index 58b20c3c300b..25029a474d30 100644 --- a/mm/memremap.c +++ b/mm/memremap.c @@ -454,7 +454,7 @@ 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(); |