Hi Michal,
First bad commit (maybe != root cause):
tree: git://git.cmpxchg.org/linux-mmotm.git master
head: 1ceb98996d2504dd4e0bcb5f4cb9009a18cd8aaa
commit: 37870392dd6966328ed2fe49a247ab37d6fa7344 [152/256] mm, hugetlb: unify core page allocation accounting and initialization
reproduce:
# apt-get install sparse
git checkout 37870392dd6966328ed2fe49a247ab37d6fa7344
make ARCH=x86_64 allmodconfig
make C=1 CF=-D__CHECK_ENDIAN__
sparse warnings: (new ones prefixed by >>)
vim +1934 mm/migrate.c
de466bd6 Mel Gorman 2013-12-18 1899
b32967ff Mel Gorman 2012-11-19 1900 /*
b32967ff Mel Gorman 2012-11-19 1901 * Attempt to migrate a misplaced page to the specified destination
b32967ff Mel Gorman 2012-11-19 1902 * node. Caller is expected to have an elevated reference count on
b32967ff Mel Gorman 2012-11-19 1903 * the page that will be dropped by this function before returning.
b32967ff Mel Gorman 2012-11-19 1904 */
1bc115d8 Mel Gorman 2013-10-07 1905 int migrate_misplaced_page(struct page *page, struct vm_area_struct *vma,
1bc115d8 Mel Gorman 2013-10-07 1906 int node)
b32967ff Mel Gorman 2012-11-19 1907 {
b32967ff Mel Gorman 2012-11-19 1908 pg_data_t *pgdat = NODE_DATA(node);
340ef390 Hugh Dickins 2013-02-22 1909 int isolated;
7039e1db Peter Zijlstra 2012-10-25 1910 int nr_remaining;
b32967ff Mel Gorman 2012-11-19 1911 LIST_HEAD(migratepages);
b32967ff Mel Gorman 2012-11-19 1912
b32967ff Mel Gorman 2012-11-19 1913 /*
1bc115d8 Mel Gorman 2013-10-07 1914 * Don't migrate file pages that are mapped in multiple processes
1bc115d8 Mel Gorman 2013-10-07 1915 * with execute permissions as they are probably shared libraries.
b32967ff Mel Gorman 2012-11-19 1916 */
1bc115d8 Mel Gorman 2013-10-07 1917 if (page_mapcount(page) != 1 && page_is_file_cache(page) &&
1bc115d8 Mel Gorman 2013-10-07 1918 (vma->vm_flags & VM_EXEC))
b32967ff Mel Gorman 2012-11-19 1919 goto out;
7039e1db Peter Zijlstra 2012-10-25 1920
b32967ff Mel Gorman 2012-11-19 1921 /*
b32967ff Mel Gorman 2012-11-19 1922 * Rate-limit the amount of data that is being migrated to a node.
b32967ff Mel Gorman 2012-11-19 1923 * Optimal placement is no good if the memory bus is saturated and
b32967ff Mel Gorman 2012-11-19 1924 * all the time is being spent migrating!
b32967ff Mel Gorman 2012-11-19 1925 */
340ef390 Hugh Dickins 2013-02-22 1926 if (numamigrate_update_ratelimit(pgdat, 1))
b32967ff Mel Gorman 2012-11-19 1927 goto out;
b32967ff Mel Gorman 2012-11-19 1928
b32967ff Mel Gorman 2012-11-19 1929 isolated = numamigrate_isolate_page(pgdat, page);
b32967ff Mel Gorman 2012-11-19 1930 if (!isolated)
b32967ff Mel Gorman 2012-11-19 1931 goto out;
b32967ff Mel Gorman 2012-11-19 1932
b32967ff Mel Gorman 2012-11-19 1933 list_add(&page->lru, &migratepages);
9c620e2b Hugh Dickins 2013-02-22 @1934 nr_remaining = migrate_pages(&migratepages, alloc_misplaced_dst_page,
68711a74 David Rientjes 2014-06-04 1935 NULL, node, MIGRATE_ASYNC,
68711a74 David Rientjes 2014-06-04 1936 MR_NUMA_MISPLACED);
7039e1db Peter Zijlstra 2012-10-25 1937 if (nr_remaining) {
59c82b70 Joonsoo Kim 2014-01-21 1938 if (!list_empty(&migratepages)) {
59c82b70 Joonsoo Kim 2014-01-21 1939 list_del(&page->lru);
599d0c95 Mel Gorman 2016-07-28 1940 dec_node_page_state(page, NR_ISOLATED_ANON +
59c82b70 Joonsoo Kim 2014-01-21 1941 page_is_file_cache(page));
59c82b70 Joonsoo Kim 2014-01-21 1942 putback_lru_page(page);
59c82b70 Joonsoo Kim 2014-01-21 1943 }
7039e1db Peter Zijlstra 2012-10-25 1944 isolated = 0;
03c5a6e1 Mel Gorman 2012-11-02 1945 } else
03c5a6e1 Mel Gorman 2012-11-02 1946 count_vm_numa_event(NUMA_PAGE_MIGRATE);
7039e1db Peter Zijlstra 2012-10-25 1947 BUG_ON(!list_empty(&migratepages));
7039e1db Peter Zijlstra 2012-10-25 1948 return isolated;
340ef390 Hugh Dickins 2013-02-22 1949
340ef390 Hugh Dickins 2013-02-22 1950 out:
340ef390 Hugh Dickins 2013-02-22 1951 put_page(page);
340ef390 Hugh Dickins 2013-02-22 1952 return 0;
7039e1db Peter Zijlstra 2012-10-25 1953 }
220018d3 Mel Gorman 2012-12-05 1954 #endif /* CONFIG_NUMA_BALANCING */
b32967ff Mel Gorman 2012-11-19 1955
:::::: The code at line 1934 was first introduced by commit
:::::: 9c620e2bc5aa4256c102ada34e6c76204ed5898b mm: remove offlining arg to migrate_pages
:::::: TO: Hugh Dickins <hughd@xxxxxxxxxx>
:::::: CC: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@xxxxxxxxx. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
