linux-kernel - [PATCH v1 2/5] KVM: s390: remove unneeded srcu lock

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Message-ID: <20250514163855.124471-3-imbrenda@linux.ibm.com>
Date: Wed, 14 May 2025 18:38:52 +0200
From: Claudio Imbrenda <imbrenda@...ux.ibm.com>
To: linux-kernel@...r.kernel.org
Cc: kvm@...r.kernel.org, linux-s390@...r.kernel.org, frankja@...ux.ibm.com,
        borntraeger@...ibm.com, seiden@...ux.ibm.com, nsg@...ux.ibm.com,
        nrb@...ux.ibm.com, david@...hat.com, hca@...ux.ibm.com,
        agordeev@...ux.ibm.com, svens@...ux.ibm.com, gor@...ux.ibm.com
Subject: [PATCH v1 2/5] KVM: s390: remove unneeded srcu lock

All paths leading to handle_essa() already hold the kvm->srcu.
Remove unneeded srcu locking from handle_essa().

Signed-off-by: Claudio Imbrenda <imbrenda@...ux.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;
-- 
2.49.0