Re: [PATCH] audit: convert status version to a feature bitmap

On Thu, 2014-11-13 at 15:29 -0500, Richard Guy Briggs wrote: > The version field defined in the audit status structure was found to have > limitations in terms of its expressibility of features supported. This is > distict from the get/set features call to be able to command those > features > that are present. > > Converting this field from a version number to a feature bitmap will allow > distributions to selectively backport and support certain features and > will > allow upstream to be able to deprecate features in the future. It will > allow userspace clients to first query the kernel for which features are > actually present and supported. Currently, EINVAL is returned rather > than EOPNOTSUP, which isn't helpful in determining if there was an error > in the command, or if it simply isn't supported yet. Past features are > not represented by this bitmap, but their use may be converted to > EOPNOTSUP if needed in the future. Maybe use DECLARE_BITMAP instead of u32 and test_bit/set_bit