linux-kernel - Re: [PATCH v7 15/45] x86/compressed: Register GHCB memory when SEV-SNP is active

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Message-ID: <YZJpNZyW8MtNZ44s@8bytes.org>
Date:   Mon, 15 Nov 2021 15:05:41 +0100
From:   Jörg Rödel <joro@...tes.org>
To:     Brijesh Singh <brijesh.singh@....com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        linux-efi@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        linux-coco@...ts.linux.dev, linux-mm@...ck.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Joerg Roedel <jroedel@...e.de>,
        Tom Lendacky <thomas.lendacky@....com>,
        "H. Peter Anvin" <hpa@...or.com>, Ard Biesheuvel <ardb@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Jim Mattson <jmattson@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Sergio Lopez <slp@...hat.com>, Peter Gonda <pgonda@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        David Rientjes <rientjes@...gle.com>,
        Dov Murik <dovmurik@...ux.ibm.com>,
        Tobin Feldman-Fitzthum <tobin@....com>,
        Borislav Petkov <bp@...en8.de>,
        Michael Roth <michael.roth@....com>,
        Vlastimil Babka <vbabka@...e.cz>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        Andi Kleen <ak@...ux.intel.com>,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>,
        tony.luck@...el.com, marcorr@...gle.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com
Subject: Re: [PATCH v7 15/45] x86/compressed: Register GHCB memory when
 SEV-SNP is active

On Wed, Nov 10, 2021 at 04:07:01PM -0600, Brijesh Singh wrote:
> +static void snp_register_ghcb_early(unsigned long paddr)

This needs __maybe_unused, otherwise it triggers a warning:

arch/x86/kernel/sev-shared.c:78:13: warning: ‘snp_register_ghcb_early’ defined but not used [-Wunused-function]
   78 | static void snp_register_ghcb_early(unsigned long paddr)
      |             ^~~~~~~~~~~~~~~~~~~~~~~