tree: https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git testing head: d6c96ec70b3ccc97eb0c6c794836a5c3340c9927 commit: 9a7254435c4fdb5ae424d9f40a48a7ded51b3367 [176/178] mux: add support for delay after muxing config: i386-randconfig-a001-20211019 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project b37efed957ed0a0193d80020aefd55cb587dfc1f) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git/commit/?id=... git remote add jic23-iio https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git git fetch --no-tags jic23-iio testing git checkout 9a7254435c4fdb5ae424d9f40a48a7ded51b3367 # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/mux/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): vim +391 drivers/mux/core.c a3b02a9c6591ce drivers/mux/mux-core.c Peter Rosin 2017-05-14 372 a3b02a9c6591ce drivers/mux/mux-core.c Peter Rosin 2017-05-14 373 /** a3b02a9c6591ce drivers/mux/mux-core.c Peter Rosin 2017-05-14 374 * mux_control_try_select() - Try to select the given multiplexer state. a3b02a9c6591ce drivers/mux/mux-core.c Peter Rosin 2017-05-14 375 * @mux: The mux-control to request a change of state from. a3b02a9c6591ce drivers/mux/mux-core.c Peter Rosin 2017-05-14 376 * @state: The new requested state. 9a7254435c4fdb drivers/mux/core.c Vincent Whitchurch 2021-10-07 377 * @delay_us: The time to delay (in microseconds) if the mux state is changed. a3b02a9c6591ce drivers/mux/mux-core.c Peter Rosin 2017-05-14 378 * a3b02a9c6591ce drivers/mux/mux-core.c Peter Rosin 2017-05-14 379 * On successfully selecting the mux-control state, it will be locked until a3b02a9c6591ce drivers/mux/mux-core.c Peter Rosin 2017-05-14 380 * mux_control_deselect() called. a3b02a9c6591ce drivers/mux/mux-core.c Peter Rosin 2017-05-14 381 * a3b02a9c6591ce drivers/mux/mux-core.c Peter Rosin 2017-05-14 382 * Therefore, make sure to call mux_control_deselect() when the operation is a3b02a9c6591ce drivers/mux/mux-core.c Peter Rosin 2017-05-14 383 * complete and the mux-control is free for others to use, but do not call a3b02a9c6591ce drivers/mux/mux-core.c Peter Rosin 2017-05-14 384 * mux_control_deselect() if mux_control_try_select() fails. a3b02a9c6591ce drivers/mux/mux-core.c Peter Rosin 2017-05-14 385 * a3b02a9c6591ce drivers/mux/mux-core.c Peter Rosin 2017-05-14 386 * Return: 0 when the mux-control state has the requested state or a negative a3b02a9c6591ce drivers/mux/mux-core.c Peter Rosin 2017-05-14 387 * errno on error. Specifically -EBUSY if the mux-control is contended. a3b02a9c6591ce drivers/mux/mux-core.c Peter Rosin 2017-05-14 388 */ 9a7254435c4fdb drivers/mux/core.c Vincent Whitchurch 2021-10-07 389 int mux_control_try_select_delay(struct mux_control *mux, unsigned int state, 9a7254435c4fdb drivers/mux/core.c Vincent Whitchurch 2021-10-07 390 unsigned int delay_us) a3b02a9c6591ce drivers/mux/mux-core.c Peter Rosin 2017-05-14 @391 { a3b02a9c6591ce drivers/mux/mux-core.c Peter Rosin 2017-05-14 392 int ret; a3b02a9c6591ce drivers/mux/mux-core.c Peter Rosin 2017-05-14 393 a3b02a9c6591ce drivers/mux/mux-core.c Peter Rosin 2017-05-14 394 if (down_trylock(&mux->lock)) a3b02a9c6591ce drivers/mux/mux-core.c Peter Rosin 2017-05-14 395 return -EBUSY; a3b02a9c6591ce drivers/mux/mux-core.c Peter Rosin 2017-05-14 396 a3b02a9c6591ce drivers/mux/mux-core.c Peter Rosin 2017-05-14 397 ret = __mux_control_select(mux, state); 9a7254435c4fdb drivers/mux/core.c Vincent Whitchurch 2021-10-07 398 if (ret >= 0) 9a7254435c4fdb drivers/mux/core.c Vincent Whitchurch 2021-10-07 399 mux_control_delay(mux, delay_us); a3b02a9c6591ce drivers/mux/mux-core.c Peter Rosin 2017-05-14 400 a3b02a9c6591ce drivers/mux/mux-core.c Peter Rosin 2017-05-14 401 if (ret < 0) a3b02a9c6591ce drivers/mux/mux-core.c Peter Rosin 2017-05-14 402 up(&mux->lock); a3b02a9c6591ce drivers/mux/mux-core.c Peter Rosin 2017-05-14 403 a3b02a9c6591ce drivers/mux/mux-core.c Peter Rosin 2017-05-14 404 return ret; a3b02a9c6591ce drivers/mux/mux-core.c Peter Rosin 2017-05-14 405 } 9a7254435c4fdb drivers/mux/core.c Vincent Whitchurch 2021-10-07 406 EXPORT_SYMBOL_GPL(mux_control_try_select_delay); a3b02a9c6591ce drivers/mux/mux-core.c Peter Rosin 2017-05-14 407 :::::: The code at line 391 was first introduced by commit :::::: a3b02a9c6591ce154cd44e2383406390a45b530c mux: minimal mux subsystem :::::: TO: Peter Rosin <peda(a)axentia.se&gt; :::::: CC: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org