tree: git://git.cmpxchg.org/linux-mmotm.git master
head: ecfddce33be51ebedf97f1e03d954c14e575afb6
commit: d9f7aec054d6fdbf8f9c4f37c269bf7fff4c04bd [61/139] mm, vmstat: skip reporting offline pages in pagetypeinfo
config: i386-defconfig (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
git checkout d9f7aec054d6fdbf8f9c4f37c269bf7fff4c04bd
# 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/vmstat.c: In function 'pagetypeinfo_showblockcount_print':
>> mm/vmstat.c:1224:16: warning: 'page' may be used uninitialized in this function [-Wmaybe-uninitialized]
struct page *page;
^~~~
vim +/page +1224 mm/vmstat.c
467c996c Mel Gorman 2007-10-16 1208
b2bd8598 David Rientjes 2017-05-03 1209 walk_zones_in_node(m, pgdat, true, pagetypeinfo_showfree_print);
467c996c Mel Gorman 2007-10-16 1210
467c996c Mel Gorman 2007-10-16 1211 return 0;
467c996c Mel Gorman 2007-10-16 1212 }
467c996c Mel Gorman 2007-10-16 1213
467c996c Mel Gorman 2007-10-16 1214 static void pagetypeinfo_showblockcount_print(struct seq_file *m,
467c996c Mel Gorman 2007-10-16 1215 pg_data_t *pgdat, struct zone *zone)
467c996c Mel Gorman 2007-10-16 1216 {
467c996c Mel Gorman 2007-10-16 1217 int mtype;
467c996c Mel Gorman 2007-10-16 1218 unsigned long pfn;
467c996c Mel Gorman 2007-10-16 1219 unsigned long start_pfn = zone->zone_start_pfn;
108bcc96 Cody P Schafer 2013-02-22 1220 unsigned long end_pfn = zone_end_pfn(zone);
467c996c Mel Gorman 2007-10-16 1221 unsigned long count[MIGRATE_TYPES] = { 0, };
467c996c Mel Gorman 2007-10-16 1222
467c996c Mel Gorman 2007-10-16 1223 for (pfn = start_pfn; pfn < end_pfn; pfn += pageblock_nr_pages) {
467c996c Mel Gorman 2007-10-16 @1224 struct page *page;
467c996c Mel Gorman 2007-10-16 1225
d9f7aec0 Michal Hocko 2017-05-18 1226 if (!pfn_to_online_page(pfn))
467c996c Mel Gorman 2007-10-16 1227 continue;
467c996c Mel Gorman 2007-10-16 1228
eb33575c Mel Gorman 2009-05-13 1229 /* Watch for unexpected holes punched in the memmap */
eb33575c Mel Gorman 2009-05-13 1230 if (!memmap_valid_within(pfn, page, zone))
e80d6a24 Mel Gorman 2008-08-14 1231 continue;
eb33575c Mel Gorman 2009-05-13 1232
:::::: The code at line 1224 was first introduced by commit
:::::: 467c996c1e1910633fa8e7adc9b052aa3ed5f97c Print out statistics in relation to fragmentation avoidance to /proc/pagetypeinfo
:::::: TO: Mel Gorman <mel@xxxxxxxxx>
:::::: CC: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxxxxxxxx>
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
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