From 83a34ad848937462aa64fa3d48f8c0b4034f2503 Mon Sep 17 00:00:00 2001 From: Jinrong Liang Date: Wed, 19 Jan 2022 22:03:25 +0800 Subject: [PATCH] selftests: kvm/x86: Fix the warning in lib/x86_64/processor.c The following warning appears when executing make -C tools/testing/selftests/kvm include/x86_64/processor.h:290:2: warning: 'ecx' may be used uninitialized in this function [-Wmaybe-uninitialized] asm volatile("cpuid" ^~~ lib/x86_64/processor.c:1523:21: note: 'ecx' was declared here uint32_t eax, ebx, ecx, edx, max_ext_leaf; Just initialize ecx to remove this warning. Fixes: c8cc43c1eae2 ("selftests: KVM: avoid failures due to reserved HyperTransport region") Signed-off-by: Jinrong Liang Message-Id: <20220119140325.59369-1-cloudliang@tencent.com> Signed-off-by: Paolo Bonzini --- tools/testing/selftests/kvm/lib/x86_64/processor.c | 1 + 1 file changed, 1 insertion(+) diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/testing/selftests/kvm/lib/x86_64/processor.c index 5c8c270a9158..5f9d7e91dc69 100644 --- a/tools/testing/selftests/kvm/lib/x86_64/processor.c +++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c @@ -1535,6 +1535,7 @@ unsigned long vm_compute_max_gfn(struct kvm_vm *vm) /* Before family 17h, the HyperTransport area is just below 1T. */ ht_gfn = (1 << 28) - num_ht_pages; eax = 1; + ecx = 0; cpuid(&eax, &ebx, &ecx, &edx); if (x86_family(eax) < 0x17) goto done; -- 2.34.1