Re: [PATCH net-next v2 2/2] net: dsa: Rename IFLA_DSA_MASTER to IFLA_DSA_CONDUIT

[Vladimir Oltean]

On Wed, Oct 11, 2023 at 04:30:03PM -0700, Stephen Hemminger wrote:
> I don't know if it would be acceptable in the kernel UAPI but what
> we did in DPDK for similar situation to cause warning on use of deprecated value.
> 
> /**
>  *  Macro to mark macros and defines scheduled for removal
>  */
> #if defined(RTE_CC_GCC) || defined(RTE_CC_CLANG)
> #define RTE_PRAGMA(x)  _Pragma(#x)
> #define RTE_PRAGMA_WARNING(w) RTE_PRAGMA(GCC warning #w)
> #define RTE_DEPRECATED(x)  RTE_PRAGMA_WARNING(#x is deprecated)
> #else
> #define RTE_DEPRECATED(x)
> #endif
> 
> ...
> #define RTE_DEV_WHITELISTED \
> 	RTE_DEPRECATED(RTE_DEV_WHITELISTED) RTE_DEV_ALLOWED
> #define RTE_DEV_BLACKLISTED \
> 	RTE_DEPRECATED(RTE_DEV_BLACKLISTED) RTE_DEV_BLOCKED

What precedent exists in terms of intentionally breaking kernel headers?
If none, would this create one?