Messages in this thread Patch in this message | | | From | Christophe JAILLET <> | Subject | [PATCH] PCI/P2PDMA: Save a few cycles in 'pci_alloc_p2pmem()' | Date | Wed, 3 Nov 2021 22:16:53 +0100 |
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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> --- drivers/pci/p2pdma.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c index 8d47cb7218d1..081c391690d4 100644 --- a/drivers/pci/p2pdma.c +++ b/drivers/pci/p2pdma.c @@ -710,7 +710,7 @@ void *pci_alloc_p2pmem(struct pci_dev *pdev, size_t size) if (!ret) goto out; - if (unlikely(!percpu_ref_tryget_live(ref))) { + if (unlikely(!percpu_ref_tryget_live_rcu(ref))) { gen_pool_free(p2pdma->pool, (unsigned long) ret, size); ret = NULL; goto out; -- 2.30.2
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