[PATCH] mm/vmalloc: Fix return value check for vb_alloc

["刘海龙(LaoLiu)" <liuhailong@oppo.com>]

If vm_map_ram(page, 0, 0) would cause panic by vmap_pages_range_noflush, so
change IS_ERR to IS_ERR_OR_NULL to fix this.

Signed-off-by: Hailong.Liu <liuhailong@oppo.com>
---
 mm/vmalloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index d12a17fc0c17..109732006cf7 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2387,7 +2387,7 @@ void *vm_map_ram(struct page **pages, unsigned int
count, int node)

        if (likely(count <= VMAP_MAX_ALLOC)) {
                mem = vb_alloc(size, GFP_KERNEL);
-               if (IS_ERR(mem))
+               if (IS_ERR_OR_NULL(mem))
                        return NULL;
                addr = (unsigned long)mem;
        } else {
--
2.34.1