linux-kernel - Re: [PATCH 2/2] x86: move gds_ucode_mitigated() declaration to header

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Date:   Wed, 9 Aug 2023 12:16:14 -0700
From:   Daniel Sneddon <daniel.sneddon@...ux.intel.com>
To:     Arnd Bergmann <arnd@...db.de>, Arnd Bergmann <arnd@...nel.org>,
        x86@...nel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Josh Poimboeuf <jpoimboe@...nel.org>
Cc:     "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Maxim Levitsky <mlevitsk@...hat.com>,
        Michal Luczaj <mhal@...x.co>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Subject: Re: [PATCH 2/2] x86: move gds_ucode_mitigated() declaration to header

On 8/9/23 11:26, Arnd Bergmann wrote:
> On Wed, Aug 9, 2023, at 18:54, Daniel Sneddon wrote:
>> HI Arnd,
>>
>> On 8/9/23 06:05, Arnd Bergmann wrote:
>>> From: Arnd Bergmann <arnd@...db.de>
>>>
>>> The declaration got placed in the .c file of the caller, but that
>>> causes a warning for the definition:
>>>
>>> arch/x86/kernel/cpu/bugs.c:682:6: error: no previous prototype for 'gds_ucode_mitigated' [-Werror=missing-prototypes]
>>
>> When I build with gcc 9.4 and the x86_64_defconfig I don't see this warning even
>> without this patch. I'm curious why you're seeing it and I'm not. Any ideas?
> 
> The warning is currently disabled by default, unless you build with
> 'make W=1'. I'm in the process of getting my last patches out to
> change this so the warning is enabled by default though, so I was
> phrasing this based on the future behavior. Sorry if this was confusing.
> 
>     Arnd

That explains why I wasn't seeing it.

Feel free to add:
Tested-by: Daniel Sneddon <daniel.sneddon@...ux.intel.com>

Thanks,
Dan