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charset="us-ascii"; Format="flowed" Errors-To: intel-wired-lan-bounces@osuosl.org Sender: "Intel-wired-lan" On 8/18/23 09:14, David Laight wrote: > From: Kees Cook >> Sent: Thursday, August 17, 2023 6:00 PM >> >> On Thu, Aug 17, 2023 at 02:35:23PM +0000, David Laight wrote: >>> From: Przemek Kitszel >>>> Sent: Wednesday, August 16, 2023 3:06 PM > ... >>>> +#define DEFINE_FLEX(type, name, member, count) \ >>>> + union { \ >>>> + u8 bytes[struct_size_t(type, member, count)]; \ >>>> + type obj; \ >>>> + } name##_u __aligned(_Alignof(type)) = {}; \ >>> >>> You shouldn't need the _Alignof() it is the default. >> >> In the sense that since "type" is in the union, it's okay? > > The alignment of the union is the larger of the alignments > of all its members. > Which is what you want. > >>> I'm not sure you should be forcing the memset() either. >> >> This already got discussed: better to fail safe. > > Perhaps call it DEFINE_FLEX_Z() to make this clear and > give the option for a non-zeroing version later. > Not everyone wants the expense of zeroing everything. per Kees, zeroing should be removed by compiler when not needed: https://lore.kernel.org/intel-wired-lan/202308101128.C4F0FA235@keescook/ Thanks for education on alignment! > > .. >>> You might want to add: >>> Static_assert(is_constexpr(count), "DEFINE_FLEX: non-constant count " #count); >> >> That would be nice, though can Static_assert()s live in the middle of >> variable definitions? > > I checked and it is fine. > (I double-checked by adding a statement and getting an error.) Static_assert with nice wording definitively would make it better, thanks again! > > David > > - > Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK > Registration No: 1397386 (Wales) > > _______________________________________________ Intel-wired-lan mailing list Intel-wired-lan@osuosl.org https://lists.osuosl.org/mailman/listinfo/intel-wired-lan