[pci-next] PCI: dwc: put struct dw_pcie::{ep,pp} into a union to reduce its size
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Message ID 20210116152711.23411-1-alobakin@pm.me
State New, archived
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  • [pci-next] PCI: dwc: put struct dw_pcie::{ep,pp} into a union to reduce its size
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Commit Message

Alexander Lobakin Jan. 16, 2021, 3:27 p.m. UTC
A single dw_pcie entity can't be a root complex and an endpoint at
the same time.
We can use this to reduce the size of dw_pcie by 80, from 280 to 200
bytes (on x32, guess more on x64), by putting the related embedded
structures (struct pcie_port and struct dw_pcie_ep) into a union.

Signed-off-by: Alexander Lobakin <alobakin@pm.me>
---
 drivers/pci/controller/dwc/pcie-designware.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

Patch
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diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 5d979953800d..924ebeaa3885 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -265,8 +265,10 @@  struct dw_pcie {
 	size_t			atu_size;
 	u32			num_ib_windows;
 	u32			num_ob_windows;
-	struct pcie_port	pp;
-	struct dw_pcie_ep	ep;
+	union {
+		struct pcie_port	pp;
+		struct dw_pcie_ep	ep;
+	};
 	const struct dw_pcie_ops *ops;
 	unsigned int		version;
 	int			num_lanes;