linux-kernel - Re: drivers/media/i2c/ccs/ccs.o: error: objtool: ccs_set_selection(): unexpected end of section .text.ccs_set

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Message-ID: <ahukd6b3wonye3zgtptvwzvrxldcruazs2exfvll6etjhmcxyj@vq3eh6pd375b>
Date: Fri, 21 Nov 2025 21:51:33 -0800
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: Nathan Chancellor <nathan@...nel.org>
Cc: kernel test robot <lkp@...el.com>, oe-kbuild-all@...ts.linux.dev, 
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>
Subject: Re: drivers/media/i2c/ccs/ccs.o: error: objtool:
 ccs_set_selection(): unexpected end of section .text.ccs_set_selection

On Fri, Nov 21, 2025 at 06:34:14PM -0700, Nathan Chancellor wrote:
> On Sat, Nov 22, 2025 at 08:41:37AM +0800, kernel test robot wrote:
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head:   2eba5e05d9bcf4cdea995ed51b0f07ba0275794a
> > commit: 188d90f817e13b66e03e110eb6f82e8f5f0d654b objtool: Append "()" to function name in "unexpected end of section" warning
> > date:   8 months ago
> > :::::: branch date: 4 hours ago
> > :::::: commit date: 8 months ago
> > config: x86_64-randconfig-101-20251122 (https://download.01.org/0day-ci/archive/20251122/202511220717.5HHMLUHG-lkp@intel.com/config)
> > compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
> > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251122/202511220717.5HHMLUHG-lkp@intel.com/reproduce)
> > 
> > If you fix the issue in a separate patch/commit (i.e. not just a new version of
> > the same patch/commit), kindly add following tags
> > | Reported-by: kernel test robot <lkp@...el.com>
> > | Closes: https://lore.kernel.org/r/202511220717.5HHMLUHG-lkp@intel.com/
> > 
> > All errors (new ones prefixed by >>):
> > 
> > >> drivers/media/i2c/ccs/ccs.o: error: objtool: ccs_set_selection(): unexpected end of section .text.ccs_set_selection
> 
> That change obviously does not result in this warning/error. This
> appears to be another divide by zero issue but based on my analysis so
> far, I do not understand how...
> 
> https://github.com/ClangBuiltLinux/linux/issues/2129

Here ya go :-)  After looking at a gazillion of these I can often spot
these pretty easily.  I'm not sure what the correct fix is here but this
made the error go away.

diff --git a/drivers/media/i2c/ccs/ccs-core.c b/drivers/media/i2c/ccs/ccs-core.c
index 1c889c878abd..2429c05bffb3 100644
--- a/drivers/media/i2c/ccs/ccs-core.c
+++ b/drivers/media/i2c/ccs/ccs-core.c
@@ -2346,7 +2346,7 @@ static void ccs_set_compose_scaler(struct v4l2_subdev *subdev,
 		* CCS_LIM(sensor, SCALER_N_MIN) / sel->r.height;
 	max_m = crops[CCS_PAD_SINK]->width
 		* CCS_LIM(sensor, SCALER_N_MIN)
-		/ CCS_LIM(sensor, MIN_X_OUTPUT_SIZE);
+		/ (CCS_LIM(sensor, MIN_X_OUTPUT_SIZE) ? : 1);
 
 	a = clamp(a, CCS_LIM(sensor, SCALER_M_MIN),
 		  CCS_LIM(sensor, SCALER_M_MAX));