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If the 'ptr' is a const, this code cause "assignment of read-only variable" error on gcc 4.x. Use __u64 instead of __typeof__(*(ptr)) for temporary variable to get rid of errors on gcc 4.x. Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Cc: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>