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Date: Mon, 8 Oct 2018 17:37:19 +0200 From: Arnd Bergmann <arnd@...db.de> To: Ilya Dryomov <idryomov@...il.com> Cc: Zheng Yan <zyan@...hat.com>, Sage Weil <sage@...hat.com>, gregkh <gregkh@...uxfoundation.org>, Philippe Ombredanne <pombredanne@...b.com>, lhenriques@...e.com, ceph-devel <ceph-devel@...r.kernel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] ceph: use an enum instead of 'static const' to define constants On Mon, Oct 8, 2018 at 4:23 PM Ilya Dryomov <idryomov@...il.com> wrote: > On Fri, Oct 5, 2018 at 6:18 PM Arnd Bergmann <arnd@...db.de> wrote: > > @@ -71,7 +71,7 @@ > > * This ensures that no two versions who have different meanings for > > * the bit ever speak to each other. > > */ > > - > > +enum ceph_features { > > DEFINE_CEPH_FEATURE( 0, 1, UID) > > DEFINE_CEPH_FEATURE( 1, 1, NOSRCADDR) > > DEFINE_CEPH_FEATURE_RETIRED( 2, 1, MONCLOCKCHECK, JEWEL, LUMINOUS) > > @@ -170,13 +170,13 @@ DEFINE_CEPH_FEATURE(61, 1, CEPHX_V2) // *do not share this bit* > > > > DEFINE_CEPH_FEATURE(62, 1, RESERVED) // do not use; used as a sentinal > > DEFINE_CEPH_FEATURE_DEPRECATED(63, 1, RESERVED_BROKEN, LUMINOUS) // client-facing > > - > > +}; > > I don't particularly like this because it looks like lower constants > are actually ints and the rest are unsigned longs, even though they all > have ULL suffixes. The standard seems to require that enum constants > be representable as ints, is the non-pedantic behaviour documented > somewhere? I had not realized that this is a gcc extension, or that it behaves slightly differently from the standard C++ behavior that apparently adopted a saner variant (all values in an enum have the same type). How about we just add a __maybe_unused to DEFINE_CEPH_FEATURE then to shut up the warning? Arnd
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