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fault_in_multipages_readable() throws set-but-unused error

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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 e23d4159b1 ("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>
This commit is contained in:
Dave Chinner 2016-09-26 09:57:33 +10:00 committed by Linus Torvalds
parent 38e0885465
commit 90b75db649
1 changed files with 1 additions and 0 deletions
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include/linux/pagemap.h
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@ -620,6 +620,7 @@ static inline int fault_in_multipages_readable(const char __user *uaddr,
return __get_user(c, end);
}
(void)c;
return 0;
}