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c6517b7815
- The guide currently says to pad the structure to a multiple of 64-bits. This is not necessary in cases where the structure contains no 64-bit types. Clarify this concept to avoid unnecessary padding. - When using __u64 to hold user pointers, blindly trying to do a cast to a void __user * may generate a warning on 32-bit systems about a cast from an integer to a pointer of different size. There is a macro to deal with this which hides an ugly double cast. Add a reference to this macro. Signed-off-by: Laura Abbott <labbott@redhat.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Jonathan Corbet <corbet@lwn.net>