linux-kernel - lib/bch.o: warning: objtool: find_poly_roots+0x5ac: sibling call from callable instruction with modified stack frame

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Message-ID: <202507260646.q8oawNxL-lkp@intel.com>
Date: Sat, 26 Jul 2025 06:02:04 +0200
From: kernel test robot <lkp@...el.com>
To: Tiezhu Yang <yangtiezhu@...ngson.cn>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	linux-kernel@...r.kernel.org, Josh Poimboeuf <jpoimboe@...nel.org>
Subject: lib/bch.o: warning: objtool: find_poly_roots+0x5ac: sibling call
 from callable instruction with modified stack frame

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   5f33ebd2018ced2600b3fad2f8e2052498eb4072
commit: e20ab7d454ee8d1e0e8b9ff73a7c87e84c666b2f LoongArch: Enable jump table for objtool
date:   5 months ago
config: loongarch-randconfig-2004-20250726 (https://download.01.org/0day-ci/archive/20250726/202507260646.q8oawNxL-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project b4edd827e4f71c2a0fcb13f79de7eae4545f0aea)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250726/202507260646.q8oawNxL-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/oe-kbuild-all/202507260646.q8oawNxL-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> lib/bch.o: warning: objtool: find_poly_roots+0x5ac: sibling call from callable instruction with modified stack frame
--
   drivers/input/touchscreen/mms114.c:507:15: warning: cast to smaller integer type 'enum mms_type' from 'const void *' [-Wvoid-pointer-to-enum-cast]
     507 |         data->type = (enum mms_type)match_data;
         |                      ^~~~~~~~~~~~~~~~~~~~~~~~~
   1 warning generated.
>> drivers/input/touchscreen/mms114.o: warning: objtool: mms114_start+0xb4: sibling call from callable instruction with modified stack frame
--
   drivers/char/applicom.c:130:25: warning: variable 'byte_reset_it' set but not used [-Wunused-but-set-variable]
     130 |         volatile unsigned char byte_reset_it;
         |                                ^
   drivers/char/applicom.c:542:6: warning: variable 'ret' set but not used [-Wunused-but-set-variable]
     542 |         int ret = 0;
         |             ^
   drivers/char/applicom.c:705:25: warning: variable 'byte_reset_it' set but not used [-Wunused-but-set-variable]
     705 |         volatile unsigned char byte_reset_it;
         |                                ^
   3 warnings generated.
>> drivers/char/applicom.o: warning: objtool: ac_ioctl+0x104: sibling call from callable instruction with modified stack frame
--
   drivers/video/fbdev/matrox/g450_pll.c:410:18: warning: variable 'mnp' set but not used [-Wunused-but-set-variable]
     410 |                                 unsigned int mnp;
         |                                              ^
   1 warning generated.
>> drivers/video/fbdev/matrox/g450_pll.o: warning: objtool: matroxfb_g450_setpll_cond+0x58: sibling call from callable instruction with modified stack frame
>> drivers/video/fbdev/matrox/g450_pll.o: warning: objtool: matroxfb_g450_setclk+0x98: sibling call from callable instruction with modified stack frame
>> drivers/video/fbdev/matrox/g450_pll.o: warning: objtool: g450_testpll+0x48: sibling call from callable instruction with modified stack frame
--
   drivers/media/i2c/adv7604.c:432:19: warning: unused function 'cec_write_clr_set' [-Wunused-function]
     432 | static inline int cec_write_clr_set(struct v4l2_subdev *sd, u8 reg, u8 mask,
         |                   ^~~~~~~~~~~~~~~~~
   1 warning generated.
>> drivers/media/i2c/adv7604.o: warning: objtool: read_stdi+0x3e4: sibling call from callable instruction with modified stack frame
>> drivers/media/i2c/adv7604.o: warning: objtool: adv76xx_set_edid+0x260: sibling call from callable instruction with modified stack frame
>> drivers/media/i2c/adv7604.o: warning: objtool: adv76xx_debugfs_if_read+0xc0: sibling call from callable instruction with modified stack frame
>> drivers/media/i2c/adv7604.o: warning: objtool: adv76xx_s_ctrl+0x64: sibling call from callable instruction with modified stack frame

-- 
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https://github.com/intel/lkp-tests/wiki