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

From: kbuild test robot
Date: Fri Oct 30 2015 - 06:34:40 EST

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@xxxxxxxxxxxxxxx>
:::::: CC: Rusty Russell <rusty@xxxxxxxxxxxxxxx>

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