Messages in this thread | | | Date | Wed, 23 Nov 2022 17:49:36 +0000 | From | Matthew Wilcox <> | Subject | Re: [PATCH 3/5] driver core: make struct device_type.uevent() take a const * |
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On Wed, Nov 23, 2022 at 01:29:56PM -0400, Jason Gunthorpe wrote: > #define generic_container_of(in_type, in, out_type, out_member) \ > _Generic(in, \ > const in_type *: ((const out_type *)container_of(in, out_type, out_member)), \ > in_type *: ((out_type *)container_of(in, out_type, out_member)) \ > )
There's a neat trick I found in seqlock.h:
#define generic_container_of(in_t, in, out_t, m) \ _Generic(*(in), \ const in_t: ((const out_t *)container_of(in, out_t, m)), \ in_t: ((out_t *)container_of(in, out_type, m)) \ )
and now it fits in 80 columns ;-)
> #define kobj_to_dev(__kobj) \ > generic_container_of(struct kobject, __kobj, struct device, kobj) > > Jason
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