[PATCH 2/6] media: atomisp: gc2235: Fix namespace collision and startup() section placement with -ffunction-sections

[Josh Poimboeuf <jpoimboe@kernel.org>]

When compiled with -ffunction-sections (e.g., for LTO, livepatch, dead
code elimination, AutoFDO, or Propeller), the startup() function gets
compiled into the .text.startup section (or in some cases
.text.startup.constprop.0 or .text.startup.isra.0).

However, the .text.startup and .text.startup.* sections are also used by
the compiler for __attribute__((constructor)) code.

This naming conflict causes the vmlinux linker script to wrongly place
startup() function code in .init.text, which gets freed during boot.

Some builds have a mix of objects, both with and without
-ffunctions-sections, so it's not possible for the linker script to
disambiguate with #ifdef CONFIG_FUNCTION_SECTIONS or similar.  This
means that "startup" unfortunately needs to be prohibited as a function
name.

Rename startup() to gc2235_startup().

Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
---
 drivers/staging/media/atomisp/i2c/atomisp-gc2235.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/media/atomisp/i2c/atomisp-gc2235.c b/drivers/staging/media/atomisp/i2c/atomisp-gc2235.c
index 6fc39ab95e46..6050637a0def 100644
--- a/drivers/staging/media/atomisp/i2c/atomisp-gc2235.c
+++ b/drivers/staging/media/atomisp/i2c/atomisp-gc2235.c
@@ -491,7 +491,7 @@ static int gc2235_s_power(struct v4l2_subdev *sd, int on)
 	return ret;
 }
 
-static int startup(struct v4l2_subdev *sd)
+static int gc2235_startup(struct v4l2_subdev *sd)
 {
 	struct gc2235_device *dev = to_gc2235_sensor(sd);
 	struct i2c_client *client = v4l2_get_subdevdata(sd);
@@ -556,7 +556,7 @@ static int gc2235_set_fmt(struct v4l2_subdev *sd,
 		return 0;
 	}
 
-	ret = startup(sd);
+	ret = gc2235_startup(sd);
 	if (ret) {
 		dev_err(&client->dev, "gc2235 startup err\n");
 		goto err;
-- 
2.51.1