linux-kernel - [PATCH] pcmcia: omap_cf: : Mark driver struct with _

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Message-Id: <9e56c0d03509d79736961ded7a1b90a361fd2e06.1730895069.git.geert+renesas@glider.be>
Date: Wed,  6 Nov 2024 13:13:57 +0100
From: Geert Uytterhoeven <geert+renesas@...der.be>
To: Dominik Brodowski <linux@...inikbrodowski.net>,
	Uwe Kleine-König <ukleinek@...nel.org>,
	Aaro Koskinen <aaro.koskinen@....fi>,
	Janusz Krzysztofik <jmkrzyszt@...il.com>,
	Tony Lindgren <tony@...mide.com>
Cc: linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH] pcmcia: omap_cf: : 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 platform_driver_probe().  Make this explicit
to prevent the following section mismatch warning

    WARNING: modpost: drivers/pcmcia/omap_cf: section mismatch in reference: omap_cf_driver+0x4 (section: .data) -> omap_cf_remove (section: .exit.text)

that triggers on an omap1_defconfig + CONFIG_OMAP_CF=m build.

Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
 drivers/pcmcia/omap_cf.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/pcmcia/omap_cf.c b/drivers/pcmcia/omap_cf.c
index 80137c7afe0d9bcf..938fad9c12aa8a4e 100644
--- a/drivers/pcmcia/omap_cf.c
+++ b/drivers/pcmcia/omap_cf.c
@@ -302,7 +302,13 @@ static void __exit omap_cf_remove(struct platform_device *pdev)
 	kfree(cf);
 }
 
-static struct platform_driver omap_cf_driver = {
+/*
+ * omap_cf_remove() lives in .exit.text. For drivers registered via
+ * 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 omap_cf_driver __refdata = {
 	.driver = {
 		.name	= driver_name,
 	},
-- 
2.34.1