diff options
| -rw-r--r-- | mm/zsmalloc.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c index 907c9b1e1e61..09ab91a3fa3f 100644 --- a/mm/zsmalloc.c +++ b/mm/zsmalloc.c @@ -1555,6 +1555,13 @@ static void zs_object_copy(struct size_class *class, unsigned long dst, d_off += size; d_size -= size; + /* + * Calling kunmap_atomic(d_addr) is necessary. kunmap_atomic() + * calls must occurs in reverse order of calls to kmap_atomic(). + * So, to call kunmap_atomic(s_addr) we should first call + * kunmap_atomic(d_addr). For more details see + * https://lore.kernel.org/linux-mm/5512421D.4000603@samsung.com/ + */ if (s_off >= PAGE_SIZE) { kunmap_atomic(d_addr); kunmap_atomic(s_addr); |