[PATCH v1 mm-hotfixes] mm/zsmalloc: do not pass __GFP_MOVABLE if CONFIG_COMPACTION=n

[Harry Yoo <harry.yoo@oracle.com>]

Commit 48b4800a1c6a ("zsmalloc: page migration support") added support
for migrating zsmalloc pages using the movable_operations migration
framework. However, the commit did not take into account that zsmalloc
supports migration only when CONFIG_COMPACTION is enabled.
Tracing shows that zsmalloc was still passing the __GFP_MOVABLE flag
even when compaction is not supported.

This can result in unmovable pages being allocated from movable page
blocks (even without stealing page blocks), ZONE_MOVABLE and CMA area.

Clear the __GFP_MOVABLE flag when !IS_ENABLED(CONFIG_COMPACTION).

Cc: stable@vger.kernel.org
Fixes: 48b4800a1c6a ("zsmalloc: page migration support")
Signed-off-by: Harry Yoo <harry.yoo@oracle.com>
---
 mm/zsmalloc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 999b513c7fdf..f3e2215f95eb 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -1043,6 +1043,9 @@ static struct zspage *alloc_zspage(struct zs_pool *pool,
 	if (!zspage)
 		return NULL;
 
+	if (!IS_ENABLED(CONFIG_COMPACTION))
+		gfp &= ~__GFP_MOVABLE;
+
 	zspage->magic = ZSPAGE_MAGIC;
 	zspage->pool = pool;
 	zspage->class = class->index;
-- 
2.43.0