Messages in this thread | | | Date | Sun, 27 Jun 2021 16:23:26 +0100 | From | Matthew Wilcox <> | Subject | Re: [RFC][PATCH 03/12] digest_lists: Basic definitions |
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On Sun, Jun 27, 2021 at 12:53:47PM +0200, Greg KH wrote: > > +enum ops { DIGEST_LIST_ADD, DIGEST_LIST_DEL, DIGEST_LIST_OP__LAST }; > > + > > For enums you export to userspace, you need to specify the values so > that all compilers get them right.
I've never heard that rule before. Where does it come from? https://en.cppreference.com/w/c/language/enum says:
If enumeration-constant is not followed by = constant-expression, its value is the value one greater than the value of the previous enumerator in the same enumeration. The value of the first enumerator (if it does not use = constant-expression) is zero.
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