linux-kernel - Re: [PATCH] KVM: arm64: Remove unused TRNG_NO

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Date:   Wed, 27 Oct 2021 08:46:44 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Qian Cai <quic_qiancai@...cinc.com>
Cc:     James Morse <james.morse@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: arm64: Remove unused TRNG_NO_ENTROPY

On 2021-10-26 22:09, Qian Cai wrote:
> TRNG_NO_ENTROPY was unused when introduced and now. This is also caught 
> by
> GCC (W=2):
> 
> arch/arm64/kvm/trng.c:17: warning: macro "TRNG_NO_ENTROPY" is not used
> [-Wunused-macros]
>    17 | #define TRNG_NO_ENTROPY   ((unsigned long)-3)
> 
> Signed-off-by: Qian Cai <quic_qiancai@...cinc.com>
> ---
>  arch/arm64/kvm/trng.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/arch/arm64/kvm/trng.c b/arch/arm64/kvm/trng.c
> index 99bdd7103c9c..6a46b3ac3970 100644
> --- a/arch/arm64/kvm/trng.c
> +++ b/arch/arm64/kvm/trng.c
> @@ -14,7 +14,6 @@
>  #define TRNG_SUCCESS			0UL
>  #define TRNG_NOT_SUPPORTED		((unsigned long)-1)
>  #define TRNG_INVALID_PARAMETER		((unsigned long)-2)
> -#define TRNG_NO_ENTROPY			((unsigned long)-3)
> 
>  #define TRNG_MAX_BITS64			192

That's an architectural definition that doesn't cause any problem.
If anything, that's documentation.

We have *tons* of other definitions with no user all over the
arm64 code. They save the exact same purpose.

         M.
-- 
Jazz is not dead. It just smells funny...