The patch titled
Subject: z3fold: fix sheduling while atomic
has been added to the -mm tree. Its filename is
z3fold-fix-sheduling-while-atomic.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/z3fold-fix-sheduling-while-atomic.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/z3fold-fix-sheduling-while-atomic.patch
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------------------------------------------------------
From: Vitaly Wool <vitalywool@xxxxxxxxx>
Subject: z3fold: fix sheduling while atomic
kmem_cache_alloc() may be called from z3fold_alloc() in atomic context, so
we need to pass correct gfp flags to avoid "scheduling while atomic" bug.
Link: http://lkml.kernel.org/r/20190523153245.119dfeed55927e8755250ddd@xxxxxxxxx
Fixes: 7c2b8baa61fe5 ("mm/z3fold.c: add structure for buddy handles")
Signed-off-by: Vitaly Wool <vitaly.vul@xxxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/z3fold.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
--- a/mm/z3fold.c~z3fold-fix-sheduling-while-atomic
+++ a/mm/z3fold.c
@@ -190,10 +190,11 @@ static int size_to_chunks(size_t size)
static void compact_page_work(struct work_struct *w);
-static inline struct z3fold_buddy_slots *alloc_slots(struct z3fold_pool *pool)
+static inline struct z3fold_buddy_slots *alloc_slots(struct z3fold_pool *pool,
+ gfp_t gfp)
{
struct z3fold_buddy_slots *slots = kmem_cache_alloc(pool->c_handle,
- GFP_KERNEL);
+ gfp);
if (slots) {
memset(slots->slot, 0, sizeof(slots->slot));
@@ -295,10 +296,10 @@ static void z3fold_unregister_migration(
/* Initializes the z3fold header of a newly allocated z3fold page */
static struct z3fold_header *init_z3fold_page(struct page *page,
- struct z3fold_pool *pool)
+ struct z3fold_pool *pool, gfp_t gfp)
{
struct z3fold_header *zhdr = page_address(page);
- struct z3fold_buddy_slots *slots = alloc_slots(pool);
+ struct z3fold_buddy_slots *slots = alloc_slots(pool, gfp);
if (!slots)
return NULL;
@@ -912,7 +913,7 @@ retry:
if (!page)
return -ENOMEM;
- zhdr = init_z3fold_page(page, pool);
+ zhdr = init_z3fold_page(page, pool, gfp);
if (!zhdr) {
__free_page(page);
return -ENOMEM;
_
Patches currently in -mm which might be from vitalywool@xxxxxxxxx are
z3fold-fix-sheduling-while-atomic.patch
