* Re: [PATCH] mm: mempolicy: N:M interleave policy for tiered memory nodes
[not found] <20220607171949.85796-1-hannes@cmpxchg.org>
@ 2022-06-08 23:44 ` kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2022-06-08 23:44 UTC (permalink / raw)
To: Johannes Weiner, linux-mm
Cc: llvm, kbuild-all, Hao Wang, Abhishek Dhanotia, Huang, Ying,
Dave Hansen, Yang Shi, Tim Chen, Davidlohr Bueso, Adam Manzanares,
linux-kernel, kernel-team, Hasan Al Maruf
Hi Johannes,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on akpm-mm/mm-everything]
url: https://github.com/intel-lab-lkp/linux/commits/Johannes-Weiner/mm-mempolicy-N-M-interleave-policy-for-tiered-memory-nodes/20220608-012652
base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
config: x86_64-randconfig-a003 (https://download.01.org/0day-ci/archive/20220609/202206090708.jaGUnz8e-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project b92436efcb7813fc481b30f2593a4907568d917a)
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://github.com/intel-lab-lkp/linux/commit/876d8daa0642d35f71ff504eeb3be4b950339a45
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Johannes-Weiner/mm-mempolicy-N-M-interleave-policy-for-tiered-memory-nodes/20220608-012652
git checkout 876d8daa0642d35f71ff504eeb3be4b950339a45
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash
If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>
All warnings (new ones prefixed by >>):
>> mm/mempolicy.c:1890:11: warning: variable 'next' is used uninitialized whenever function 'next_node_tier' is called [-Wsometimes-uninitialized]
unsigned next, start = nid;
~~~~~~~~~^~~~
mm/mempolicy.c:1893:23: note: uninitialized use occurs here
next = next_node_in(next, policy->nodes);
^~~~
include/linux/nodemask.h:278:46: note: expanded from macro 'next_node_in'
#define next_node_in(n, src) __next_node_in((n), &(src))
^
mm/mempolicy.c:1890:15: note: initialize the variable 'next' to silence this warning
unsigned next, start = nid;
^
= 0
1 warning generated.
vim +1890 mm/mempolicy.c
1887
1888 static unsigned next_node_tier(int nid, struct mempolicy *policy, bool toptier)
1889 {
> 1890 unsigned next, start = nid;
1891
1892 do {
1893 next = next_node_in(next, policy->nodes);
1894 if (next == MAX_NUMNODES)
1895 break;
1896 if (toptier == node_is_toptier(next))
1897 break;
1898 } while (next != start);
1899 return next;
1900 }
1901
--
0-DAY CI Kernel Test Service
https://01.org/lkp
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