Hi Andrew,
Today's linux-next merge of the akpm tree got a conflict in
mm/huge_memory.c between commit 2083d67027ad ("mm/mempolicy: Implement
change_prot_numa() in terms of change_protection()") from the tip, tree
and commit "thp: change_huge_pmd(): make sure we don't try to make a page
writable" from the akpm tree.
I fixed it up (I think - see below) and can carry the fix as necessary (no
action is required).
--
Cheers,
Stephen Rothwell sfr@xxxxxxxxxxxxxxxx
diff --cc include/linux/migrate.h
index bcb5ddc,50d2974..0000000
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@@ -7,16 -7,13 +7,23 @@@
typedef struct page *new_page_t(struct page *, unsigned long private, int **);
+enum migrate_reason {
+ MR_COMPACTION,
+ MR_MEMORY_FAILURE,
+ MR_MEMORY_HOTPLUG,
+ MR_SYSCALL, /* also applies to cpusets */
+ MR_MEMPOLICY_MBIND,
+ MR_NUMA_MISPLACED,
+ MR_CMA
+};
+
+ /*
+ * Return values from addresss_space_operations.migratepage():
+ * - negative errno on page migration failure;
+ * - zero on page migration success;
+ */
+ #define MIGRATEPAGE_SUCCESS 0
+
#ifdef CONFIG_MIGRATION
extern void putback_lru_pages(struct list_head *l);
diff --cc mm/migrate.c
index c0afe60,c3724b6..0000000
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@@ -981,8 -977,7 +981,8 @@@ int migrate_pages(struct list_head *fro
case -EAGAIN:
retry++;
break;
- case 0:
+ case MIGRATEPAGE_SUCCESS:
+ nr_succeeded++;
break;
default:
/* Permanent failure */
@@@ -991,14 -986,8 +991,14 @@@
}
}
}
- rc = 0;
+ rc = nr_failed + retry;
out:
+ if (nr_succeeded)
+ count_vm_events(PGMIGRATE_SUCCESS, nr_succeeded);
+ if (nr_failed)
+ count_vm_events(PGMIGRATE_FAIL, nr_failed);
+ trace_mm_migrate_pages(nr_succeeded, nr_failed, mode, reason);
+
if (!swapwrite)
current->flags &= ~PF_SWAPWRITE;
diff --cc mm/huge_memory.c
index 2c4e4d4,28a368c..0000000
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@@ -1352,17 -1433,8 +1352,18 @@@ int change_huge_pmd(struct vm_area_stru
if (__pmd_trans_huge_lock(pmd, vma) == 1) {
pmd_t entry;
entry = pmdp_get_and_clear(mm, addr, pmd);
- entry = pmd_modify(entry, newprot);
+ if (!prot_numa)
+ entry = pmd_modify(entry, newprot);
+ else {
+ struct page *page = pmd_page(*pmd);
+
+ /* only check non-shared pages */
+ if (page_mapcount(page) == 1 &&
+ !pmd_numa(*pmd)) {
+ entry = pmd_mknuma(entry);
+ }
+ }
+ BUG_ON(pmd_write(entry));
set_pmd_at(mm, addr, pmd, entry);
spin_unlock(&vma->vm_mm->page_table_lock);
ret = 1;
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