linux-kernel - Re: [PATCH v2 3/3] misc: fastrpc: Add polling mode support for fastRPC driver

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Message-ID: <202511070654.mdaukM8U-lkp@intel.com>
Date: Fri, 7 Nov 2025 07:10:15 +0800
From: kernel test robot <lkp@...el.com>
To: Ekansh Gupta <ekansh.gupta@....qualcomm.com>, srini@...nel.org,
	linux-arm-msm@...r.kernel.org
Cc: oe-kbuild-all@...ts.linux.dev, gregkh@...uxfoundation.org,
	quic_bkumar@...cinc.com, linux-kernel@...r.kernel.org,
	quic_chennak@...cinc.com, dri-devel@...ts.freedesktop.org,
	arnd@...db.de, dmitry.baryshkov@....qualcomm.com
Subject: Re: [PATCH v2 3/3] misc: fastrpc: Add polling mode support for
 fastRPC driver

Hi Ekansh,

kernel test robot noticed the following build warnings:

[auto build test WARNING on char-misc/char-misc-testing]
[also build test WARNING on char-misc/char-misc-next char-misc/char-misc-linus linus/master v6.18-rc4 next-20251106]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Ekansh-Gupta/misc-fastrpc-Move-fdlist-to-invoke-context-structure/20251106-131118
base:   char-misc/char-misc-testing
patch link:    https://lore.kernel.org/r/20251106050839.3091707-4-ekansh.gupta%40oss.qualcomm.com
patch subject: [PATCH v2 3/3] misc: fastrpc: Add polling mode support for fastRPC driver
config: parisc-randconfig-001-20251107 (https://download.01.org/0day-ci/archive/20251107/202511070654.mdaukM8U-lkp@intel.com/config)
compiler: hppa-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251107/202511070654.mdaukM8U-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/202511070654.mdaukM8U-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/misc/fastrpc.c: In function 'fastrpc_set_option':
>> drivers/misc/fastrpc.c:1883:9: warning: unused variable 'err' [-Wunused-variable]
     int i, err = 0;
            ^~~

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for OF_GPIO
   Depends on [n]: GPIOLIB [=y] && OF [=n] && HAS_IOMEM [=y]
   Selected by [y]:
   - GPIO_TB10X [=y] && GPIOLIB [=y] && HAS_IOMEM [=y] && (ARC_PLAT_TB10X || COMPILE_TEST [=y])
   WARNING: unmet direct dependencies detected for MFD_STMFX
   Depends on [n]: HAS_IOMEM [=y] && I2C [=y] && OF [=n]
   Selected by [y]:
   - PINCTRL_STMFX [=y] && PINCTRL [=y] && I2C [=y] && OF_GPIO [=y] && HAS_IOMEM [=y]
   WARNING: unmet direct dependencies detected for GPIO_SYSCON
   Depends on [n]: GPIOLIB [=y] && HAS_IOMEM [=y] && MFD_SYSCON [=y] && OF [=n]
   Selected by [y]:
   - GPIO_SAMA5D2_PIOBU [=y] && GPIOLIB [=y] && HAS_IOMEM [=y] && MFD_SYSCON [=y] && OF_GPIO [=y] && (ARCH_AT91 || COMPILE_TEST [=y])
   WARNING: unmet direct dependencies detected for I2C_K1
   Depends on [n]: I2C [=y] && HAS_IOMEM [=y] && (ARCH_SPACEMIT || COMPILE_TEST [=y]) && OF [=n]
   Selected by [y]:
   - MFD_SPACEMIT_P1 [=y] && HAS_IOMEM [=y] && (ARCH_SPACEMIT || COMPILE_TEST [=y]) && I2C [=y]


vim +/err +1883 drivers/misc/fastrpc.c

  1879	
  1880	static int fastrpc_set_option(struct fastrpc_user *fl, char __user *argp)
  1881	{
  1882		struct fastrpc_ioctl_set_option opt = {0};
> 1883		int i, err = 0;
  1884	
  1885		if (copy_from_user(&opt, argp, sizeof(opt)))
  1886			return -EFAULT;
  1887	
  1888		for (i = 0; i < ARRAY_SIZE(opt.reserved); i++) {
  1889			if (opt.reserved[i] != 0)
  1890				return -EINVAL;
  1891		}
  1892		if (opt.req != FASTRPC_POLL_MODE)
  1893			return -EINVAL;
  1894	
  1895		if (opt.enable)
  1896			fl->poll_mode = true;
  1897		else
  1898			fl->poll_mode = false;
  1899	
  1900		return 0;
  1901	}
  1902	

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