linux-kernel - [PATCH] parport: amiga: Mark driver struct with _

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Date: Fri, 29 Mar 2024 22:54:39 +0100
From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To: Sudip Mukherjee <sudipm.mukherjee@...il.com>
Cc: linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	kernel@...gutronix.de
Subject: [PATCH] parport: amiga: Mark driver struct with __refdata to prevent section mismatch

As described in the added code comment, a reference to .exit.text is ok
for drivers registered via module_platform_driver_probe(). Make this
explicit to prevent the following section mismatch warning

	WARNING: modpost: drivers/parport/parport_amiga: section mismatch in reference: amiga_parallel_driver+0x8 (section: .data) -> amiga_parallel_remove (section: .exit.text)

that triggers on an allmodconfig W=1 build.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
---
 drivers/parport/parport_amiga.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/parport/parport_amiga.c b/drivers/parport/parport_amiga.c
index e6dc857aac3f..e06c7b2aac5c 100644
--- a/drivers/parport/parport_amiga.c
+++ b/drivers/parport/parport_amiga.c
@@ -229,7 +229,13 @@ static void __exit amiga_parallel_remove(struct platform_device *pdev)
 	parport_put_port(port);
 }
 
-static struct platform_driver amiga_parallel_driver = {
+/*
+ * amiga_parallel_remove() lives in .exit.text. For drivers registered via
+ * module_platform_driver_probe() this is ok because they cannot get unbound at
+ * runtime. So mark the driver struct with __refdata to prevent modpost
+ * triggering a section mismatch warning.
+ */
+static struct platform_driver amiga_parallel_driver __refdata = {
 	.remove_new = __exit_p(amiga_parallel_remove),
 	.driver   = {
 		.name	= "amiga-parallel",
base-commit: a6bd6c9333397f5a0e2667d4d82fef8c970108f2
-- 
2.43.0