linux-kernel - Re: [PATCH 1/4] riscv: kvm: vcpu_timer: fix unused variable warnings

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Date:   Fri, 19 Aug 2022 13:09:01 -0700
From:   Atish Patra <atishp@...shpatra.org>
To:     Conor Dooley <mail@...chuod.ie>
Cc:     Anup Patel <anup@...infault.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Guo Ren <guoren@...nel.org>,
        Vincent Chen <vincent.chen@...ive.com>,
        Xianting Tian <xianting.tian@...ux.alibaba.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Tong Tiangen <tongtiangen@...wei.com>, kvm@...r.kernel.org,
        kvm-riscv@...ts.infradead.org, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] riscv: kvm: vcpu_timer: fix unused variable warnings

On Sun, Aug 14, 2022 at 7:12 AM Conor Dooley <mail@...chuod.ie> wrote:
>
> From: Conor Dooley <conor.dooley@...rochip.com>
>
> In two places, csr is set but never used:
>
> arch/riscv/kvm/vcpu_timer.c:302:23: warning: variable 'csr' set but not used [-Wunused-but-set-variable]
>         struct kvm_vcpu_csr *csr;
>                              ^
> arch/riscv/kvm/vcpu_timer.c:327:23: warning: variable 'csr' set but not used [-Wunused-but-set-variable]
>         struct kvm_vcpu_csr *csr;
>                              ^
>
> Remove the variable.
>
> Fixes: 8f5cb44b1bae ("RISC-V: KVM: Support sstc extension")
> Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
> ---
>  arch/riscv/kvm/vcpu_timer.c | 4 ----
>  1 file changed, 4 deletions(-)
>
> diff --git a/arch/riscv/kvm/vcpu_timer.c b/arch/riscv/kvm/vcpu_timer.c
> index 16f50c46ba39..185f2386a747 100644
> --- a/arch/riscv/kvm/vcpu_timer.c
> +++ b/arch/riscv/kvm/vcpu_timer.c
> @@ -299,7 +299,6 @@ static void kvm_riscv_vcpu_update_timedelta(struct kvm_vcpu *vcpu)
>
>  void kvm_riscv_vcpu_timer_restore(struct kvm_vcpu *vcpu)
>  {
> -       struct kvm_vcpu_csr *csr;
>         struct kvm_vcpu_timer *t = &vcpu->arch.timer;
>
>         kvm_riscv_vcpu_update_timedelta(vcpu);
> @@ -307,7 +306,6 @@ void kvm_riscv_vcpu_timer_restore(struct kvm_vcpu *vcpu)
>         if (!t->sstc_enabled)
>                 return;
>
> -       csr = &vcpu->arch.guest_csr;
>  #if defined(CONFIG_32BIT)
>         csr_write(CSR_VSTIMECMP, (u32)t->next_cycles);
>         csr_write(CSR_VSTIMECMPH, (u32)(t->next_cycles >> 32));
> @@ -324,13 +322,11 @@ void kvm_riscv_vcpu_timer_restore(struct kvm_vcpu *vcpu)
>
>  void kvm_riscv_vcpu_timer_save(struct kvm_vcpu *vcpu)
>  {
> -       struct kvm_vcpu_csr *csr;
>         struct kvm_vcpu_timer *t = &vcpu->arch.timer;
>
>         if (!t->sstc_enabled)
>                 return;
>
> -       csr = &vcpu->arch.guest_csr;
>         t = &vcpu->arch.timer;
>  #if defined(CONFIG_32BIT)
>         t->next_cycles = csr_read(CSR_VSTIMECMP);
> --
> 2.37.1
>

Thanks for fixing this. Sorry for missing those.


--
Regards,
Atish