tree: git://git.cmpxchg.org/linux-mmotm.git master
head: fa78008f505569e7988ed3eb737ca7d43d87eac3
commit: 6f387b30fdba17b62b7c13d67d3caebbcc3bef0c [159/293] mm: consolidate GFP_NOFAIL checks in the allocator slowpath
config: i386-allmodconfig (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
git checkout 6f387b30fdba17b62b7c13d67d3caebbcc3bef0c
# save the attached .config to linux build tree
make ARCH=i386
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 >>):
mm/page_alloc.c: In function '__alloc_pages_slowpath':
>> mm/page_alloc.c:3546:15: warning: 'alloc_flags' may be used uninitialized in this function [-Wmaybe-uninitialized]
unsigned int alloc_flags;
^~~~~~~~~~~
vim +/alloc_flags +3546 mm/page_alloc.c
ede377137 Michal Hocko 2016-05-20 3530 else
ede377137 Michal Hocko 2016-05-20 3531 cond_resched();
ede377137 Michal Hocko 2016-05-20 3532
0a0337e0d Michal Hocko 2016-05-20 3533 return true;
0a0337e0d Michal Hocko 2016-05-20 3534 }
0a0337e0d Michal Hocko 2016-05-20 3535 }
0a0337e0d Michal Hocko 2016-05-20 3536
0a0337e0d Michal Hocko 2016-05-20 3537 return false;
0a0337e0d Michal Hocko 2016-05-20 3538 }
0a0337e0d Michal Hocko 2016-05-20 3539
11e33f6a5 Mel Gorman 2009-06-16 3540 static inline struct page *
11e33f6a5 Mel Gorman 2009-06-16 3541 __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
a9263751e Vlastimil Babka 2015-02-11 3542 struct alloc_context *ac)
11e33f6a5 Mel Gorman 2009-06-16 3543 {
d0164adc8 Mel Gorman 2015-11-06 3544 bool can_direct_reclaim = gfp_mask & __GFP_DIRECT_RECLAIM;
11e33f6a5 Mel Gorman 2009-06-16 3545 struct page *page = NULL;
c603844bd Mel Gorman 2016-05-19 @3546 unsigned int alloc_flags;
11e33f6a5 Mel Gorman 2009-06-16 3547 unsigned long did_some_progress;
ca01798b3 Vlastimil Babka 2017-01-21 3548 enum compact_priority compact_priority;
c5d01d0d1 Michal Hocko 2016-05-20 3549 enum compact_result compact_result;
ca01798b3 Vlastimil Babka 2017-01-21 3550 int compaction_retries;
ca01798b3 Vlastimil Babka 2017-01-21 3551 int no_progress_loops;
63f53dea0 Michal Hocko 2016-10-07 3552 unsigned long alloc_start = jiffies;
63f53dea0 Michal Hocko 2016-10-07 3553 unsigned int stall_timeout = 10 * HZ;
ca01798b3 Vlastimil Babka 2017-01-21 3554 unsigned int cpuset_mems_cookie;
:::::: The code at line 3546 was first introduced by commit
:::::: c603844bdcb5238980de8d58b393f52d7729d651 mm, page_alloc: convert alloc_flags to unsigned
:::::: TO: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
:::::: CC: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
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