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authorGustavo Pimentel <gustavo.pimentel@synopsys.com>2018-05-14 18:09:49 +0300
committerLorenzo Pieralisi <lorenzo.pieralisi@arm.com>2018-05-14 19:04:05 +0300
commit6995de2168edc6e58a350e7eb76e02dd191b64f4 (patch)
tree308b86fd1559f47e5a842287d12d3e106cfa5a83 /drivers/pci/dwc/pcie-designware-host.c
parentb4a8a51caf7de47c2fb03dfb1bbbe442661b5732 (diff)
downloadlinux-6995de2168edc6e58a350e7eb76e02dd191b64f4.tar.xz
PCI: dwc: Small computation improvement
Replace a division by 2 operation for a right shift rotation of 1 bit. Probably any recent and decent compiler does this kind of substitution in order to improve code performance. Nevertheless it's a coding good practice whenever there is a division / multiplication by multiple of 2 to replace it by the equivalent operation in this case, the shift rotation. Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Acked-by: Jingoo Han <jingoohan1@gmail.com> Acked-by: Joao Pinto <jpinto@synopsys.com>
Diffstat (limited to 'drivers/pci/dwc/pcie-designware-host.c')
-rw-r--r--drivers/pci/dwc/pcie-designware-host.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/pci/dwc/pcie-designware-host.c b/drivers/pci/dwc/pcie-designware-host.c
index 5a23f782851a..fc55fde8742e 100644
--- a/drivers/pci/dwc/pcie-designware-host.c
+++ b/drivers/pci/dwc/pcie-designware-host.c
@@ -332,8 +332,8 @@ int dw_pcie_host_init(struct pcie_port *pp)
cfg_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "config");
if (cfg_res) {
- pp->cfg0_size = resource_size(cfg_res) / 2;
- pp->cfg1_size = resource_size(cfg_res) / 2;
+ pp->cfg0_size = resource_size(cfg_res) >> 1;
+ pp->cfg1_size = resource_size(cfg_res) >> 1;
pp->cfg0_base = cfg_res->start;
pp->cfg1_base = cfg_res->start + pp->cfg0_size;
} else if (!pp->va_cfg0_base) {
@@ -377,8 +377,8 @@ int dw_pcie_host_init(struct pcie_port *pp)
break;
case 0:
pp->cfg = win->res;
- pp->cfg0_size = resource_size(pp->cfg) / 2;
- pp->cfg1_size = resource_size(pp->cfg) / 2;
+ pp->cfg0_size = resource_size(pp->cfg) >> 1;
+ pp->cfg1_size = resource_size(pp->cfg) >> 1;
pp->cfg0_base = pp->cfg->start;
pp->cfg1_base = pp->cfg->start + pp->cfg0_size;
break;