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    SubjectRe: [PATCH] fs: O_* bit numbers uniqueness check
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    > + /* please add new bits here to ensure allocation uniqueness */
    > + BUG_ON(20 != hweight32(
    > + O_RDONLY | O_WRONLY | O_RDWR |

    I wonder if there's a way to make this BUILD_BUG_ON(), so the problem is
    caught at compile time (a change like adding an O_ flag is often compile
    tested only for obscure archs). One could create a compile-time
    macro-ized version of hweight32() and use that, I guess, although I'm
    not sure it's worth the ugliness.

    Failing that maybe this should be WARN_ON()? I'd be annoyed if my arch
    wouldn't boot because some strange new O_ flag happened to collide.

    - R.


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