linux-kernel - [mingo-tip:sched/headers 1476/2340] kernel/power/wakelock.c:57:11: error: implicit declaration of function 'sysfs_emit

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Date:   Thu, 24 Feb 2022 11:43:11 +0800
From:   kernel test robot <lkp@...el.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: [mingo-tip:sched/headers 1476/2340] kernel/power/wakelock.c:57:11:
 error: implicit declaration of function 'sysfs_emit_at'

tree:   git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git sched/headers
head:   97c5eeb4de3ad324ed2a4656b46465299cfd010a
commit: b6a38a38fb2817f6575f45302405e6cfae374b4e [1476/2340] headers/deps: kobject: Use <linux/sysfs_types.h> in <linux/kobject.h>, remove <linux/sysfs.h> inclusion
config: i386-randconfig-a011 (https://download.01.org/0day-ci/archive/20220224/202202241133.jDlh5h9y-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project d271fc04d5b97b12e6b797c6067d3c96a8d7470e)
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/mingo/tip.git/commit/?id=b6a38a38fb2817f6575f45302405e6cfae374b4e
        git remote add mingo-tip git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git
        git fetch --no-tags mingo-tip sched/headers
        git checkout b6a38a38fb2817f6575f45302405e6cfae374b4e
        # save the config file 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

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

Note: the mingo-tip/sched/headers HEAD 97c5eeb4de3ad324ed2a4656b46465299cfd010a builds fine.
      It only hurts bisectability.

All errors (new ones prefixed by >>):

>> kernel/power/wakelock.c:57:11: error: implicit declaration of function 'sysfs_emit_at' [-Werror,-Wimplicit-function-declaration]
                           len += sysfs_emit_at(buf, len, "%s ", wl->name);
                                  ^
   kernel/power/wakelock.c:60:9: error: implicit declaration of function 'sysfs_emit_at' [-Werror,-Wimplicit-function-declaration]
           len += sysfs_emit_at(buf, len, "\n");
                  ^
   2 errors generated.


vim +/sysfs_emit_at +57 kernel/power/wakelock.c

b86ff9820fd5df Rafael J. Wysocki  2012-04-29  45  
b86ff9820fd5df Rafael J. Wysocki  2012-04-29  46  ssize_t pm_show_wakelocks(char *buf, bool show_active)
b86ff9820fd5df Rafael J. Wysocki  2012-04-29  47  {
b86ff9820fd5df Rafael J. Wysocki  2012-04-29  48  	struct rb_node *node;
b86ff9820fd5df Rafael J. Wysocki  2012-04-29  49  	struct wakelock *wl;
c9d967b2ce40d7 Greg Kroah-Hartman 2022-01-13  50  	int len = 0;
b86ff9820fd5df Rafael J. Wysocki  2012-04-29  51  
b86ff9820fd5df Rafael J. Wysocki  2012-04-29  52  	mutex_lock(&wakelocks_lock);
b86ff9820fd5df Rafael J. Wysocki  2012-04-29  53  
b86ff9820fd5df Rafael J. Wysocki  2012-04-29  54  	for (node = rb_first(&wakelocks_tree); node; node = rb_next(node)) {
b86ff9820fd5df Rafael J. Wysocki  2012-04-29  55  		wl = rb_entry(node, struct wakelock, node);
2434aea58e652a Tri Vo             2019-08-06  56  		if (wl->ws->active == show_active)
c9d967b2ce40d7 Greg Kroah-Hartman 2022-01-13 @57  			len += sysfs_emit_at(buf, len, "%s ", wl->name);
b86ff9820fd5df Rafael J. Wysocki  2012-04-29  58  	}
b86ff9820fd5df Rafael J. Wysocki  2012-04-29  59  
c9d967b2ce40d7 Greg Kroah-Hartman 2022-01-13  60  	len += sysfs_emit_at(buf, len, "\n");
b86ff9820fd5df Rafael J. Wysocki  2012-04-29  61  
b86ff9820fd5df Rafael J. Wysocki  2012-04-29  62  	mutex_unlock(&wakelocks_lock);
c9d967b2ce40d7 Greg Kroah-Hartman 2022-01-13  63  	return len;
b86ff9820fd5df Rafael J. Wysocki  2012-04-29  64  }
b86ff9820fd5df Rafael J. Wysocki  2012-04-29  65  

:::::: The code at line 57 was first introduced by commit
:::::: c9d967b2ce40d71e968eb839f36c936b8a9cf1ea PM: wakeup: simplify the output logic of pm_show_wakelocks()

:::::: TO: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
:::::: CC: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org