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[195.150.55.226]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-ba4517ec776sm475683266b.16.2026.04.21.10.30.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 21 Apr 2026 10:30:17 -0700 (PDT) From: Piotr Zarycki To: kvm@vger.kernel.org Cc: seanjc@google.com, pbonzini@redhat.com, shuah@kernel.org, vkuznets@redhat.com, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org, Piotr Zarycki Subject: [PATCH] KVM: selftests: hyperv_tlb_flush: replace NOP loop with udelay() Date: Tue, 21 Apr 2026 19:29:53 +0200 Message-ID: <20260421172953.191345-1-piotr.zarycki@gmail.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: kernel-janitors@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Replace the open-coded NOP loop with udelay() which was added to KVM selftests in commit 6b878cbb87bf ("KVM: selftests: Add guest udelay() utility for x86"). The NOP loop is CPU speed dependent while udelay() provides a deterministic delay regardless of host CPU frequency. Signed-off-by: Piotr Zarycki --- tools/testing/selftests/kvm/x86/hyperv_tlb_flush.c | 8 +------- 1 file changed, 1 insertion(+), 7 deletions(-) diff --git a/tools/testing/selftests/kvm/x86/hyperv_tlb_flush.c b/tools/testing/selftests/kvm/x86/hyperv_tlb_flush.c index c542cc4762b1..68ebd790ff41 100644 --- a/tools/testing/selftests/kvm/x86/hyperv_tlb_flush.c +++ b/tools/testing/selftests/kvm/x86/hyperv_tlb_flush.c @@ -141,15 +141,9 @@ static void swap_two_test_pages(vm_paddr_t pte_gva1, vm_paddr_t pte_gva2) *(uint64_t *)pte_gva2 = tmp; } -/* - * TODO: replace the silly NOP loop with a proper udelay() implementation. - */ static inline void do_delay(void) { - int i; - - for (i = 0; i < 1000000; i++) - asm volatile("nop"); + udelay(100); } /* -- 2.53.0