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--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -422,7 +422,7 @@ static inline int fault_in_pages_writeab
static inline int fault_in_pages_readable(const char __user *uaddr, int size)
{
- volatile char c;
+ volatile char c __maybe_unused;
int ret;
if (unlikely(size == 0))
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