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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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