[tip: objtool/core] media: atomisp: Fix namespace collision and startup() section placement with -ffunction-sections

["tip-bot2 for Josh Poimboeuf" <tip-bot2@linutronix.de>]

The following commit has been merged into the objtool/core branch of tip:

Commit-ID:     56255fa96871d3bd0d924a53585cdf5594262891
Gitweb:        https://git.kernel.org/tip/56255fa96871d3bd0d924a53585cdf5594262891
Author:        Josh Poimboeuf <jpoimboe@kernel.org>
AuthorDate:    Wed, 12 Nov 2025 15:47:49 -08:00
Committer:     Ingo Molnar <mingo@kernel.org>
CommitterDate: Thu, 13 Nov 2025 08:03:09 +01:00

media: atomisp: Fix namespace collision and startup() section placement with -ffunction-sections

When compiling the kernel with -ffunction-sections (e.g., for LTO,
livepatch, dead code elimination, AutoFDO, or Propeller), the startup()
function gets compiled into the .text.startup section.  In some cases it
can even be cloned into .text.startup.constprop.0 or
.text.startup.isra.0.

However, the .text.startup and .text.startup.* section names are already
reserved for use 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.

Fix that by renaming startup() to ov2722_startup().

Fixes: 6568f14cb5ae ("vmlinux.lds: Exclude .text.startup and .text.exit from TEXT_MAIN")
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: live-patching@vger.kernel.org
Cc: Hans de Goede <hansg@kernel.org>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://patch.msgid.link/bf8cd823a3f11f64cc82167913be5013c72afa57.1762991150.git.jpoimboe@kernel.org
---
 drivers/staging/media/atomisp/i2c/atomisp-ov2722.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/media/atomisp/i2c/atomisp-ov2722.c b/drivers/staging/media/atomisp/i2c/atomisp-ov2722.c
index c7de780..a4519ba 100644
--- a/drivers/staging/media/atomisp/i2c/atomisp-ov2722.c
+++ b/drivers/staging/media/atomisp/i2c/atomisp-ov2722.c
@@ -600,7 +600,7 @@ static int ov2722_s_power(struct v4l2_subdev *sd, int on)
 }
 
 /* TODO: remove it. */
-static int startup(struct v4l2_subdev *sd)
+static int ov2722_startup(struct v4l2_subdev *sd)
 {
 	struct ov2722_device *dev = to_ov2722_sensor(sd);
 	struct i2c_client *client = v4l2_get_subdevdata(sd);
@@ -662,7 +662,7 @@ static int ov2722_set_fmt(struct v4l2_subdev *sd,
 	dev->pixels_per_line = dev->res->pixels_per_line;
 	dev->lines_per_frame = dev->res->lines_per_frame;
 
-	ret = startup(sd);
+	ret = ov2722_startup(sd);
 	if (ret) {
 		int i = 0;
 
@@ -677,7 +677,7 @@ static int ov2722_set_fmt(struct v4l2_subdev *sd,
 				dev_err(&client->dev, "power up failed, continue\n");
 				continue;
 			}
-			ret = startup(sd);
+			ret = ov2722_startup(sd);
 			if (ret) {
 				dev_err(&client->dev, " startup FAILED!\n");
 			} else {