From 90b75db6498a19da96dac4b55c909ff3721f3045 Mon Sep 17 00:00:00 2001
From: Dave Chinner <dchinner@redhat.com>
Date: Mon, 26 Sep 2016 09:57:33 +1000
Subject: [PATCH] fault_in_multipages_readable() throws set-but-unused error
When building XFS with -Werror, it now fails with:
include/linux/pagemap.h: In function 'fault_in_multipages_readable':
include/linux/pagemap.h:602:16: error: variable 'c' set but not used [-Werror=unused-but-set-variable]
volatile char c;
^
This is a regression caused by commit e23d4159b109 ("fix
fault_in_multipages_...() on architectures with no-op access_ok()").
Fix it by re-adding the "(void)c" trick taht was previously used to make
the compiler think the variable is used.
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
include/linux/pagemap.h | 1 +
1 file changed, 1 insertion(+)
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 7e3d53753612..01e84436cddf 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -620,6 +620,7 @@ static inline int fault_in_multipages_readable(const char __user *uaddr,
return __get_user(c, end);
}
+ (void)c;
return 0;
}
--
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