linux-kernel - Re: [PATCH v3 06/10] hwmon: (fam15h_power) Add compute unit accumulated power

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Date:	Fri, 30 Oct 2015 18:33:42 +0800
From:	kbuild test robot <lkp@...el.com>
To:	Huang Rui <ray.huang@....com>
Cc:	kbuild-all@...org, Borislav Petkov <bp@...e.de>,
	Guenter Roeck <linux@...ck-us.net>,
	Peter Zijlstra <peterz@...radead.org>,
	Jean Delvare <jdelvare@...e.de>,
	Andy Lutomirski <luto@...capital.net>,
	Andreas Herrmann <herrmann.der.user@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <lenb@...nel.org>,
	John Stultz <john.stultz@...aro.org>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	lm-sensors@...sensors.org, linux-kernel@...r.kernel.org,
	x86@...nel.org,
	Andreas Herrmann <herrmann.der.user@...glemail.com>,
	Aravind Gopalakrishnan <Aravind.Gopalakrishnan@....com>,
	Borislav Petkov <bp@...en8.de>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Aaron Lu <aaron.lu@...el.com>,
	SPG_Linux_Kernel <SPG_Linux_Kernel@....com>,
	Huang Rui <ray.huang@....com>
Subject: Re: [PATCH v3 06/10] hwmon: (fam15h_power) Add compute unit
 accumulated power

Hi Huang,

[auto build test WARNING on hwmon/hwmon-next -- if it's inappropriate base, please suggest rules for selecting the more suitable base]

url:    https://github.com/0day-ci/linux/commits/Huang-Rui/hwmon-fam15h_power-Introduce-an-accumulated-power-reporting-algorithm/20151030-181426
config: x86_64-randconfig-x012-10300134 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

Note: it may well be a FALSE warning. FWIW you are at least aware of it now.
http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings

All warnings (new ones prefixed by >>):

   In file included from arch/x86/include/asm/cpumask.h:4:0,
                    from arch/x86/include/asm/msr.h:10,
                    from arch/x86/include/asm/processor.h:20,
                    from arch/x86/include/asm/atomic.h:6,
                    from include/linux/atomic.h:4,
                    from include/linux/debug_locks.h:5,
                    from include/linux/lockdep.h:23,
                    from include/linux/spinlock_types.h:18,
                    from include/linux/mutex.h:15,
                    from include/linux/kernfs.h:13,
                    from include/linux/sysfs.h:15,
                    from include/linux/kobject.h:21,
                    from include/linux/device.h:17,
                    from include/linux/hwmon-sysfs.h:23,
                    from drivers/hwmon/fam15h_power.c:23:
   drivers/hwmon/fam15h_power.c: In function 'fam15h_power_probe':
>> include/linux/cpumask.h:24:29: warning: 'res_mask' may be used uninitialized in this function [-Wmaybe-uninitialized]
    #define cpumask_bits(maskp) ((maskp)->bits)
                                ^
   drivers/hwmon/fam15h_power.c:145:32: note: 'res_mask' was declared here
     cpumask_var_t mask, tmp_mask, res_mask;
                                   ^

vim +/res_mask +24 include/linux/cpumask.h

^1da177e Linus Torvalds 2005-04-16   8   */
^1da177e Linus Torvalds 2005-04-16   9  #include <linux/kernel.h>
^1da177e Linus Torvalds 2005-04-16  10  #include <linux/threads.h>
^1da177e Linus Torvalds 2005-04-16  11  #include <linux/bitmap.h>
187f1882 Paul Gortmaker 2011-11-23  12  #include <linux/bug.h>
^1da177e Linus Torvalds 2005-04-16  13  
cdfdef75 Rusty Russell  2015-03-05  14  /* Don't assign or return these: may not be this big! */
2d3854a3 Rusty Russell  2008-11-05  15  typedef struct cpumask { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t;
^1da177e Linus Torvalds 2005-04-16  16  
ae7a47e7 Rusty Russell  2008-12-30  17  /**
6ba2ef7b Rusty Russell  2009-09-24  18   * cpumask_bits - get the bits in a cpumask
6ba2ef7b Rusty Russell  2009-09-24  19   * @maskp: the struct cpumask *
ae7a47e7 Rusty Russell  2008-12-30  20   *
6ba2ef7b Rusty Russell  2009-09-24  21   * You should only assume nr_cpu_ids bits of this mask are valid.  This is
6ba2ef7b Rusty Russell  2009-09-24  22   * a macro so it's const-correct.
ae7a47e7 Rusty Russell  2008-12-30  23   */
6ba2ef7b Rusty Russell  2009-09-24 @24  #define cpumask_bits(maskp) ((maskp)->bits)
7ea931c9 Paul Jackson   2008-04-28  25  
f1bbc032 Tejun Heo      2015-02-13  26  /**
f1bbc032 Tejun Heo      2015-02-13  27   * cpumask_pr_args - printf args to output a cpumask
f1bbc032 Tejun Heo      2015-02-13  28   * @maskp: cpumask to be printed
f1bbc032 Tejun Heo      2015-02-13  29   *
f1bbc032 Tejun Heo      2015-02-13  30   * Can be used to provide arguments for '%*pb[l]' when printing a cpumask.
f1bbc032 Tejun Heo      2015-02-13  31   */
f1bbc032 Tejun Heo      2015-02-13  32  #define cpumask_pr_args(maskp)		nr_cpu_ids, cpumask_bits(maskp)

:::::: The code at line 24 was first introduced by commit
:::::: 6ba2ef7baac23a5d9bb85e28b882d16b439a2293 cpumask: Move deprecated functions to end of header.

:::::: TO: Rusty Russell <rusty@...tcorp.com.au>
:::::: CC: Rusty Russell <rusty@...tcorp.com.au>

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