linux-kernel - [PATCH v2] PCI: kirin: Fix section mismatch warning

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Message-Id: <20180919185341.31298-1-natechancellor@gmail.com>
Date:   Wed, 19 Sep 2018 11:53:42 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Xiaowei Song <songxiaowei@...ilicon.com>,
        Binghui Wang <wangbinghui@...ilicon.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <natechancellor@...il.com>
Subject: [PATCH v2] PCI: kirin: Fix section mismatch warning

WARNING: vmlinux.o(.text+0x4758cc): Section mismatch in reference from
the function kirin_pcie_probe() to the function
.init.text:kirin_add_pcie_port()
The function kirin_pcie_probe() references
the function __init kirin_add_pcie_port().
This is often because kirin_pcie_probe lacks a __init
annotation or the annotation of kirin_add_pcie_port is wrong.

Add the __init annotation to both kirin_pcie_probe and
kirin_pcie_add_msi then use builtin_platform_driver_probe
instead of builtin_platform_driver + .probe to avoid a section
mismatch warning with kirin_pcie_driver.

Fixes: fc5165db245a ("PCI: kirin: Add HiSilicon Kirin SoC PCIe controller driver")
Reported-by: Nick Desaulniers <ndesaulniers@...gle.com>
Suggested-by: Nick Desaulniers <ndesaulniers@...gle.com>
Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
---

v1 -> v2:

Instead of removing the annotation on kirin_add_pcie_port, add it to
kirin_pcie_add_msi and kirin_pcie_probe. To avoid a warning with this
configuration, use builtin_platform_driver_probe.

 drivers/pci/controller/dwc/pcie-kirin.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-kirin.c b/drivers/pci/controller/dwc/pcie-kirin.c
index 5352e0c3be82..f64fed12de51 100644
--- a/drivers/pci/controller/dwc/pcie-kirin.c
+++ b/drivers/pci/controller/dwc/pcie-kirin.c
@@ -448,8 +448,8 @@ static const struct dw_pcie_host_ops kirin_pcie_host_ops = {
 	.host_init = kirin_pcie_host_init,
 };
 
-static int kirin_pcie_add_msi(struct dw_pcie *pci,
-				struct platform_device *pdev)
+static int __init kirin_pcie_add_msi(struct dw_pcie *pci,
+				     struct platform_device *pdev)
 {
 	int irq;
 
@@ -481,7 +481,7 @@ static int __init kirin_add_pcie_port(struct dw_pcie *pci,
 	return dw_pcie_host_init(&pci->pp);
 }
 
-static int kirin_pcie_probe(struct platform_device *pdev)
+static int __init kirin_pcie_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct kirin_pcie *kirin_pcie;
@@ -533,11 +533,10 @@ static const struct of_device_id kirin_pcie_match[] = {
 };
 
 static struct platform_driver kirin_pcie_driver = {
-	.probe			= kirin_pcie_probe,
 	.driver			= {
 		.name			= "kirin-pcie",
 		.of_match_table = kirin_pcie_match,
 		.suppress_bind_attrs = true,
 	},
 };
-builtin_platform_driver(kirin_pcie_driver);
+builtin_platform_driver_probe(kirin_pcie_driver, kirin_pcie_probe);
-- 
2.19.0