Let's just return 0 on success, which is less confusing.
... especially because we got it wrong in the migrate.h stub where we
have "return -EAGAIN; /* can't migrate now */" instead of "return 0;".
Likely this wrong return value doesn't currently matter, but it
certainly adds confusion.
We'll add migrate_misplaced_folio_prepare() next, where we want to use
the same "return 0 on success" approach, so let's just clean this up.
Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
---
mm/huge_memory.c | 5 ++---
mm/memory.c | 2 +-
mm/migrate.c | 4 ++--
3 files changed, 5 insertions(+), 6 deletions(-)
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 0fffaa58a47a..fc27dabcd8e3 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1652,7 +1652,7 @@ vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf)
unsigned long haddr = vmf->address & HPAGE_PMD_MASK;
int nid = NUMA_NO_NODE;
int target_nid, last_cpupid = (-1 & LAST_CPUPID_MASK);
- bool migrated = false, writable = false;
+ bool writable = false;
int flags = 0;
vmf->ptl = pmd_lock(vma->vm_mm, vmf->pmd);
@@ -1696,8 +1696,7 @@ vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf)
spin_unlock(vmf->ptl);
writable = false;
- migrated = migrate_misplaced_folio(folio, vma, target_nid);
- if (migrated) {
+ if (!migrate_misplaced_folio(folio, vma, target_nid)) {
flags |= TNF_MIGRATED;
nid = target_nid;
} else {
diff --git a/mm/memory.c b/mm/memory.c
index 00728ea95583..118660de5bcc 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -5354,7 +5354,7 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf)
ignore_writable = true;
/* Migrate to the requested node */
- if (migrate_misplaced_folio(folio, vma, target_nid)) {
+ if (!migrate_misplaced_folio(folio, vma, target_nid)) {
nid = target_nid;
flags |= TNF_MIGRATED;
} else {
diff --git a/mm/migrate.c b/mm/migrate.c
index 781979567f64..0307b54879a0 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -2629,11 +2629,11 @@ int migrate_misplaced_folio(struct folio *folio, struct vm_area_struct *vma,
nr_succeeded);
}
BUG_ON(!list_empty(&migratepages));
- return isolated;
+ return isolated ? 0 : -EAGAIN;
