linux-kernel - Re: [PATCH v3 08/15] x86/power/keylocker: Restore internal wrapping key from the ACPI S3/4 sleep states

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Message-ID: <YaWa2+2eVSFXY1U3@sol.localdomain>
Date:   Mon, 29 Nov 2021 19:30:35 -0800
From:   Eric Biggers <ebiggers@...nel.org>
To:     "Chang S. Bae" <chang.seok.bae@...el.com>
Cc:     tglx@...utronix.de, bp@...e.de, dave.hansen@...ux.intel.com,
        mingo@...nel.org, luto@...nel.org, x86@...nel.org,
        herbert@...dor.apana.org.au, linux-kernel@...r.kernel.org,
        linux-crypto@...r.kernel.org, dan.j.williams@...el.com,
        charishma1.gairuboyina@...el.com, kumar.n.dwarakanath@...el.com,
        lalithambika.krishnakumar@...el.com, ravi.v.shankar@...el.com,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH v3 08/15] x86/power/keylocker: Restore internal wrapping
 key from the ACPI S3/4 sleep states

On Wed, Nov 24, 2021 at 12:06:53PM -0800, Chang S. Bae wrote:
> diff --git a/arch/x86/include/asm/keylocker.h b/arch/x86/include/asm/keylocker.h
> index 820ac29c06d9..4000a5eed2c2 100644
> --- a/arch/x86/include/asm/keylocker.h
> +++ b/arch/x86/include/asm/keylocker.h
> @@ -32,9 +32,13 @@ struct iwkey {
>  #ifdef CONFIG_X86_KEYLOCKER
>  void setup_keylocker(struct cpuinfo_x86 *c);
>  void destroy_keylocker_data(void);
> +void restore_keylocker(void);
> +extern bool valid_keylocker(void);
>  #else
>  #define setup_keylocker(c) do { } while (0)
>  #define destroy_keylocker_data() do { } while (0)
> +#define restore_keylocker() do { } while (0)
> +static inline bool valid_keylocker { return false; }
>  #endif

This breaks the build when !CONFIG_X86_KEYLOCKER.

- Eric