linux-kernel - Re: [PATCH v2 3/3] clk: microchip: core: allow driver to be compiled with COMPILE

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Message-ID: <202512050233.R9hAWsJN-lkp@intel.com>
Date: Fri, 5 Dec 2025 10:21:55 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: oe-kbuild@...ts.linux.dev, Brian Masney <bmasney@...hat.com>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>, Maxime Ripard <mripard@...nel.org>,
	Claudiu Beznea <claudiu.beznea@...on.dev>,
	Conor Dooley <conor@...nel.org>
Cc: lkp@...el.com, oe-kbuild-all@...ts.linux.dev, linux-clk@...r.kernel.org,
	linux-kernel@...r.kernel.org, Brian Masney <bmasney@...hat.com>
Subject: Re: [PATCH v2 3/3] clk: microchip: core: allow driver to be compiled
 with COMPILE_TEST

Hi Brian,

kernel test robot noticed the following build warnings:

url:    https://github.com/intel-lab-lkp/linux/commits/Brian-Masney/clk-microchip-core-remove-duplicate-determine_rate-on-pic32_sclk_ops/20251202-060924
base:   92fd6e84175befa1775e5c0ab682938eca27c0b2
patch link:    https://lore.kernel.org/r/20251201-clk-microchip-fixes-v2-3-9d5a0daadd98%40redhat.com
patch subject: [PATCH v2 3/3] clk: microchip: core: allow driver to be compiled with COMPILE_TEST
config: arm-randconfig-r071-20251204 (https://download.01.org/0day-ci/archive/20251205/202512050233.R9hAWsJN-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 12.5.0

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>
| Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
| Closes: https://lore.kernel.org/r/202512050233.R9hAWsJN-lkp@intel.com/

smatch warnings:
drivers/clk/microchip/clk-core.c:300 roclk_get_parent() warn: signedness bug returning '(-22)'
drivers/clk/microchip/clk-core.c:833 sclk_get_parent() warn: signedness bug returning '(-22)'

vim +300 drivers/clk/microchip/clk-core.c

ce6e11884659988 Purna Chandra Mandal 2016-05-13  286  static u8 roclk_get_parent(struct clk_hw *hw)
                                                             ^^
returns a u8.

ce6e11884659988 Purna Chandra Mandal 2016-05-13  287  {
ce6e11884659988 Purna Chandra Mandal 2016-05-13  288  	struct pic32_ref_osc *refo = clkhw_to_refosc(hw);
ce6e11884659988 Purna Chandra Mandal 2016-05-13  289  	u32 v, i;
ce6e11884659988 Purna Chandra Mandal 2016-05-13  290  
ce6e11884659988 Purna Chandra Mandal 2016-05-13  291  	v = (readl(refo->ctrl_reg) >> REFO_SEL_SHIFT) & REFO_SEL_MASK;
ce6e11884659988 Purna Chandra Mandal 2016-05-13  292  
ce6e11884659988 Purna Chandra Mandal 2016-05-13  293  	if (!refo->parent_map)
ce6e11884659988 Purna Chandra Mandal 2016-05-13  294  		return v;
ce6e11884659988 Purna Chandra Mandal 2016-05-13  295  
ce6e11884659988 Purna Chandra Mandal 2016-05-13  296  	for (i = 0; i < clk_hw_get_num_parents(hw); i++)
ce6e11884659988 Purna Chandra Mandal 2016-05-13  297  		if (refo->parent_map[i] == v)
ce6e11884659988 Purna Chandra Mandal 2016-05-13  298  			return i;
ce6e11884659988 Purna Chandra Mandal 2016-05-13  299  
ce6e11884659988 Purna Chandra Mandal 2016-05-13 @300  	return -EINVAL;
                                                        ^^^^^^^^^^^^^^^
So it can't return negative error codes.

ce6e11884659988 Purna Chandra Mandal 2016-05-13  301  }

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki