From 42f3c28afcda6a6221edaf533abba41d3566d3a3 Mon Sep 17 00:00:00 2001
From: Jinrong Liang <cloudliang@tencent.com>
Date: Wed, 19 Jan 2022 22:03:25 +0800
Subject: [PATCH 08/10] selftests: kvm/x86: Fix the warning in
lib/x86_64/processor.c
Git-commit: 83a34ad848937462aa64fa3d48f8c0b4034f2503
Patch-mainline: v5.17-rc1
References: bsc#1194526
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 <cloudliang@tencent.com>
Message-Id: <20220119140325.59369-1-cloudliang@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Li Zhang <lizhang@suse.de>
---
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 da73b97e1e6d..add8294c2a7e 100644
--- a/tools/testing/selftests/kvm/lib/x86_64/processor.c
+++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c
@@ -1473,6 +1473,7 @@ 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;
--
2.31.1