Commit 90b75db6 authored Sep 26, 2016 by Dave Chinner Committed by Linus Torvalds Sep 25, 2016

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 e23d4159 ("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>

parent 38e08854

include/linux/pagemap.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -620,6 +620,7 @@ static inline int fault_in_multipages_readable(const char __user *uaddr,
		return __get_user(c, end);
		}

		(void)c;
		return 0;
		}