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authorBaolin Wang <baolin.wang@linux.alibaba.com>2023-02-15 18:39:36 +0800
committerAndrew Morton <akpm@linux-foundation.org>2023-02-20 12:46:17 -0800
commit9747b9e92418b61c2281561e0651803f1fad0159 (patch)
tree44c7ff35ae3305863b4708818a8b91704d69ff91 /mm
parentf7f9c00dfafffd7a5a1a5685e2d874c64913e2ed (diff)
mm: hugetlb: change to return bool for isolate_hugetlb()
Now the isolate_hugetlb() only returns 0 or -EBUSY, and most users did not care about the negative value, thus we can convert the isolate_hugetlb() to return a boolean value to make code more clear when checking the hugetlb isolation state. Moreover converts 2 users which will consider the negative value returned by isolate_hugetlb(). No functional changes intended. [akpm@linux-foundation.org: shorten locked section, per SeongJae Park] Link: https://lkml.kernel.org/r/12a287c5bebc13df304387087bbecc6421510849.1676424378.git.baolin.wang@linux.alibaba.com Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com> Acked-by: David Hildenbrand <david@redhat.com> Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Reviewed-by: SeongJae Park <sj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/hugetlb.c13
-rw-r--r--mm/memory-failure.c2
-rw-r--r--mm/mempolicy.c2
-rw-r--r--mm/migrate.c7
4 files changed, 13 insertions, 11 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 3a01a9dbf445..07abcb6eb203 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2925,12 +2925,15 @@ retry:
*/
goto free_new;
} else if (folio_ref_count(old_folio)) {
+ bool isolated;
+
/*
* Someone has grabbed the folio, try to isolate it here.
* Fail with -EBUSY if not possible.
*/
spin_unlock_irq(&hugetlb_lock);
- ret = isolate_hugetlb(old_folio, list);
+ isolated = isolate_hugetlb(old_folio, list);
+ ret = isolated ? 0 : -EBUSY;
spin_lock_irq(&hugetlb_lock);
goto free_new;
} else if (!folio_test_hugetlb_freed(old_folio)) {
@@ -3005,7 +3008,7 @@ int isolate_or_dissolve_huge_page(struct page *page, struct list_head *list)
if (hstate_is_gigantic(h))
return -ENOMEM;
- if (folio_ref_count(folio) && !isolate_hugetlb(folio, list))
+ if (folio_ref_count(folio) && isolate_hugetlb(folio, list))
ret = 0;
else if (!folio_ref_count(folio))
ret = alloc_and_dissolve_hugetlb_folio(h, folio, list);
@@ -7251,15 +7254,15 @@ __weak unsigned long hugetlb_mask_last_page(struct hstate *h)
* These functions are overwritable if your architecture needs its own
* behavior.
*/
-int isolate_hugetlb(struct folio *folio, struct list_head *list)
+bool isolate_hugetlb(struct folio *folio, struct list_head *list)
{
- int ret = 0;
+ bool ret = true;
spin_lock_irq(&hugetlb_lock);
if (!folio_test_hugetlb(folio) ||
!folio_test_hugetlb_migratable(folio) ||
!folio_try_get(folio)) {
- ret = -EBUSY;
+ ret = false;
goto unlock;
}
folio_clear_hugetlb_migratable(folio);
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index e504362fdb23..8604753bc644 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -2508,7 +2508,7 @@ static bool isolate_page(struct page *page, struct list_head *pagelist)
bool isolated = false;
if (PageHuge(page)) {
- isolated = !isolate_hugetlb(page_folio(page), pagelist);
+ isolated = isolate_hugetlb(page_folio(page), pagelist);
} else {
bool lru = !__PageMovable(page);
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 2751bc3310fd..a256a241fd1d 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -609,7 +609,7 @@ static int queue_folios_hugetlb(pte_t *pte, unsigned long hmask,
if (flags & (MPOL_MF_MOVE_ALL) ||
(flags & MPOL_MF_MOVE && folio_estimated_sharers(folio) == 1 &&
!hugetlb_pmd_shared(pte))) {
- if (isolate_hugetlb(folio, qp->pagelist) &&
+ if (!isolate_hugetlb(folio, qp->pagelist) &&
(flags & MPOL_MF_STRICT))
/*
* Failed to isolate folio but allow migrating pages
diff --git a/mm/migrate.c b/mm/migrate.c
index 53010a142e7f..2db546a0618c 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -2095,6 +2095,7 @@ static int add_page_for_migration(struct mm_struct *mm, unsigned long addr,
struct vm_area_struct *vma;
struct page *page;
int err;
+ bool isolated;
mmap_read_lock(mm);
err = -EFAULT;
@@ -2126,13 +2127,11 @@ static int add_page_for_migration(struct mm_struct *mm, unsigned long addr,
if (PageHuge(page)) {
if (PageHead(page)) {
- err = isolate_hugetlb(page_folio(page), pagelist);
- if (!err)
- err = 1;
+ isolated = isolate_hugetlb(page_folio(page), pagelist);
+ err = isolated ? 1 : -EBUSY;
}
} else {
struct page *head;
- bool isolated;
head = compound_head(page);
isolated = isolate_lru_page(head);