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Date:   Fri, 13 Oct 2023 02:13:45 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     Florian Fainelli <florian.fainelli@...adcom.com>,
        netdev@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        "open list:ARM/Mediatek SoC support" <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH net-next v2 2/2] net: dsa: Rename IFLA_DSA_MASTER to
 IFLA_DSA_CONDUIT

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?

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