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Message-Id: <20231118155105.25678-15-yury.norov@gmail.com>
Date: Sat, 18 Nov 2023 07:50:45 -0800
From: Yury Norov <yury.norov@...il.com>
To: linux-kernel@...r.kernel.org,
"K. Y. Srinivasan" <kys@...rosoft.com>,
Haiyang Zhang <haiyangz@...rosoft.com>,
Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
Lorenzo Pieralisi <lpieralisi@...nel.org>,
Krzysztof WilczyĆski <kw@...ux.com>,
Rob Herring <robh@...nel.org>,
Bjorn Helgaas <bhelgaas@...gle.com>,
linux-hyperv@...r.kernel.org, linux-pci@...r.kernel.org
Cc: Yury Norov <yury.norov@...il.com>, Jan Kara <jack@...e.cz>,
Mirsad Todorovac <mirsad.todorovac@....unizg.hr>,
Matthew Wilcox <willy@...radead.org>,
Rasmus Villemoes <linux@...musvillemoes.dk>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Maxim Kuvyrkov <maxim.kuvyrkov@...aro.org>,
Alexey Klimov <klimov.linux@...il.com>
Subject: [PATCH 14/34] PCI: hv: switch hv_get_dom_num() to use atomic find_bit()
The function traverses bitmap with for_each_clear_bit() just to allocate
a bit atomically. We can do it better with a dedicated find_and_set_bit().
Signed-off-by: Yury Norov <yury.norov@...il.com>
---
drivers/pci/controller/pci-hyperv.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)
diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c
index 30c7dfeccb16..033b1fb7f4eb 100644
--- a/drivers/pci/controller/pci-hyperv.c
+++ b/drivers/pci/controller/pci-hyperv.c
@@ -3605,12 +3605,9 @@ static u16 hv_get_dom_num(u16 dom)
if (test_and_set_bit(dom, hvpci_dom_map) == 0)
return dom;
- for_each_clear_bit(i, hvpci_dom_map, HVPCI_DOM_MAP_SIZE) {
- if (test_and_set_bit(i, hvpci_dom_map) == 0)
- return i;
- }
+ i = find_and_set_bit(hvpci_dom_map, HVPCI_DOM_MAP_SIZE);
- return HVPCI_DOM_INVALID;
+ return i < HVPCI_DOM_MAP_SIZE ? i : HVPCI_DOM_INVALID;
}
/**
--
2.39.2
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