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Re: [PATCH] Optimize int_sqrt for small values for faster idle

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Hi Andi,

[auto build test WARNING on v4.5-rc1]
[also build test WARNING on next-20160128]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/Andi-Kleen/Optimize-int_sqrt-for-small-values-for-faster-idle/20160129-054629
config: avr32-atngw100_defconfig (attached as .config)
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=avr32 

All warnings (new ones prefixed by >>):

   lib/int_sqrt.c: In function 'int_sqrt':
>> lib/int_sqrt.c:25: warning: 'm' is used uninitialized in this function

vim +/m +25 lib/int_sqrt.c

     9	#include <linux/export.h>
    10	
    11	/**
    12	 * int_sqrt - rough approximation to sqrt
    13	 * @x: integer of which to calculate the sqrt
    14	 *
    15	 * A very rough approximation to the sqrt() function.
    16	 */
    17	unsigned long int_sqrt(unsigned long x)
    18	{
    19		unsigned long b, m, y = 0;
    20	
    21		if (x <= 1)
    22			return x;
    23	
    24		if (x <= 0xffff) {
  > 25			if (m <= 0xff)
    26				m = 1UL << (8 - 2);
    27			else
    28				m = 1UL << (16 - 2);
    29		} else if (x <= 0xffffffff)
    30			m = 1UL << (32 - 2);
    31		else
    32			m = 1UL << (BITS_PER_LONG - 2);
    33		while (m != 0) {

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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[PATCH] Optimize int_sqrt for small values for faster idle Andi Kleen <andi@firstfloor.org> - 2016-01-28 22:50 +0100
  Re: [PATCH] Optimize int_sqrt for small values for faster idle kbuild test robot <lkp@intel.com> - 2016-01-28 23:10 +0100
  Re: [PATCH] Optimize int_sqrt for small values for faster idle Joe Perches <joe@perches.com> - 2016-01-28 23:20 +0100
    Re: [PATCH] Optimize int_sqrt for small values for faster idle Andi Kleen <andi@firstfloor.org> - 2016-01-28 23:50 +0100
  Re: [PATCH] Optimize int_sqrt for small values for faster idle kbuild test robot <lkp@intel.com> - 2016-01-28 23:20 +0100
  Re: [PATCH] Optimize int_sqrt for small values for faster idle Joe Perches <joe@perches.com> - 2016-01-28 23:30 +0100
  Re: [PATCH] Optimize int_sqrt for small values for faster idle Andi Kleen <andi@firstfloor.org> - 2016-01-28 23:40 +0100
  Re: [PATCH] Optimize int_sqrt for small values for faster idle Eric Dumazet <eric.dumazet@gmail.com> - 2016-01-28 23:40 +0100
  Re: [PATCH] Optimize int_sqrt for small values for faster idle "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-01-29 05:00 +0100
  Re: [PATCH] Optimize int_sqrt for small values for faster idle Thomas Rohwer <trohwer85@gmail.com> - 2016-01-31 08:30 +0100
  Re: [PATCH] Optimize int_sqrt for small values for faster idle Rasmus Villemoes <linux@rasmusvillemoes.dk> - 2016-02-01 22:30 +0100
    Re: [PATCH] Optimize int_sqrt for small values for faster idle Andi Kleen <ak@linux.intel.com> - 2016-02-01 22:40 +0100
      Re: [PATCH] Optimize int_sqrt for small values for faster idle Rasmus Villemoes <linux@rasmusvillemoes.dk> - 2016-02-02 00:10 +0100
        Re: [PATCH] Optimize int_sqrt for small values for faster idle Andi Kleen <ak@linux.intel.com> - 2016-02-02 01:10 +0100
        Re: [PATCH] Optimize int_sqrt for small values for faster idle Eric Dumazet <eric.dumazet@gmail.com> - 2016-02-02 01:40 +0100
          Re: [PATCH] Optimize int_sqrt for small values for faster idle Rasmus Villemoes <linux@rasmusvillemoes.dk> - 2016-02-02 21:50 +0100
            Re: [PATCH] Optimize int_sqrt for small values for faster idle Eric Dumazet <eric.dumazet@gmail.com> - 2016-02-02 22:40 +0100
      Re: [PATCH] Optimize int_sqrt for small values for faster idle Rasmus Villemoes <linux@rasmusvillemoes.dk> - 2016-02-07 22:40 +0100

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