Re: [PATCH v1 2/5] KVM: s390: remove unneeded srcu lock

[Christian Borntraeger <borntraeger@de.ibm.com>]

Am 14.05.25 um 18:38 schrieb Claudio Imbrenda:
> All paths leading to handle_essa() already hold the kvm->srcu.
You could add
since commit 800c1065c320 ("KVM: s390: Lock kvm->srcu at the appropriate places").

> Remove unneeded srcu locking from handle_essa().
> 
> Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>

Reviewed-by: Christian Borntraeger <borntraeger@linux.ibm.com>



> ---
>   arch/s390/kvm/priv.c | 4 ----
>   1 file changed, 4 deletions(-)
> 
> diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
> index 1a49b89706f8..758cefb5bac7 100644
> --- a/arch/s390/kvm/priv.c
> +++ b/arch/s390/kvm/priv.c
> @@ -1297,12 +1297,8 @@ static int handle_essa(struct kvm_vcpu *vcpu)
>   		/* Retry the ESSA instruction */
>   		kvm_s390_retry_instr(vcpu);
>   	} else {
> -		int srcu_idx;
> -
>   		mmap_read_lock(vcpu->kvm->mm);
> -		srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
>   		i = __do_essa(vcpu, orc);
> -		srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
>   		mmap_read_unlock(vcpu->kvm->mm);
>   		if (i < 0)
>   			return i;