[PATCH v2] hw/i386: changes towards enabling -Wshadow=local

[Ani Sinha <anisinha@redhat.com>]

Code changes that addresses all compiler complaints coming from enabling
-Wshadow flags. Enabling -Wshadow catches cases of local variables shadowing
other local variables or parameters. These makes the code confusing and/or adds
bugs that are difficult to catch.

CC: Markus Armbruster <armbru@redhat.com>
CC: Philippe Mathieu-Daude <philmd@linaro.org>
CC: mst@redhat.com
Message-Id: <87r0mqlf9x.fsf@pond.sub.org>
Signed-off-by: Ani Sinha <anisinha@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
---
 hw/i386/acpi-microvm.c | 12 ++++++------
 hw/i386/intel_iommu.c  |  8 ++++----
 hw/i386/pc.c           |  1 -
 hw/i386/x86.c          |  2 --
 4 files changed, 10 insertions(+), 13 deletions(-)

changelog:
v2: kept Peter's changes from https://lore.kernel.org/r/20230922160410.138786-1-peterx@redhat.com
and removed mine.

diff --git a/hw/i386/acpi-microvm.c b/hw/i386/acpi-microvm.c
index a075360d85..6e4f8061eb 100644
--- a/hw/i386/acpi-microvm.c
+++ b/hw/i386/acpi-microvm.c
@@ -78,18 +78,18 @@ static void acpi_dsdt_add_virtio(Aml *scope,
             hwaddr base = VIRTIO_MMIO_BASE + index * 512;
             hwaddr size = 512;
 
-            Aml *dev = aml_device("VR%02u", (unsigned)index);
-            aml_append(dev, aml_name_decl("_HID", aml_string("LNRO0005")));
-            aml_append(dev, aml_name_decl("_UID", aml_int(index)));
-            aml_append(dev, aml_name_decl("_CCA", aml_int(1)));
+            Aml *adev = aml_device("VR%02u", (unsigned)index);
+            aml_append(adev, aml_name_decl("_HID", aml_string("LNRO0005")));
+            aml_append(adev, aml_name_decl("_UID", aml_int(index)));
+            aml_append(adev, aml_name_decl("_CCA", aml_int(1)));
 
             Aml *crs = aml_resource_template();
             aml_append(crs, aml_memory32_fixed(base, size, AML_READ_WRITE));
             aml_append(crs,
                        aml_interrupt(AML_CONSUMER, AML_LEVEL, AML_ACTIVE_HIGH,
                                      AML_EXCLUSIVE, &irq, 1));
-            aml_append(dev, aml_name_decl("_CRS", crs));
-            aml_append(scope, dev);
+            aml_append(adev, aml_name_decl("_CRS", crs));
+            aml_append(scope, adev);
         }
     }
 }
diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index c0ce896668..2c832ab68b 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -3744,7 +3744,7 @@ VTDAddressSpace *vtd_find_add_as(IntelIOMMUState *s, PCIBus *bus,
 /* Unmap the whole range in the notifier's scope. */
 static void vtd_address_space_unmap(VTDAddressSpace *as, IOMMUNotifier *n)
 {
-    hwaddr size, remain;
+    hwaddr total, remain;
     hwaddr start = n->start;
     hwaddr end = n->end;
     IntelIOMMUState *s = as->iommu_state;
@@ -3765,7 +3765,7 @@ static void vtd_address_space_unmap(VTDAddressSpace *as, IOMMUNotifier *n)
     }
 
     assert(start <= end);
-    size = remain = end - start + 1;
+    total = remain = end - start + 1;
 
     while (remain >= VTD_PAGE_SIZE) {
         IOMMUTLBEvent event;
@@ -3793,10 +3793,10 @@ static void vtd_address_space_unmap(VTDAddressSpace *as, IOMMUNotifier *n)
     trace_vtd_as_unmap_whole(pci_bus_num(as->bus),
                              VTD_PCI_SLOT(as->devfn),
                              VTD_PCI_FUNC(as->devfn),
-                             n->start, size);
+                             n->start, total);
 
     map.iova = n->start;
-    map.size = size - 1; /* Inclusive */
+    map.size = total - 1; /* Inclusive */
     iova_tree_remove(as->iova_tree, map);
 }
 
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 3db0743f31..e7a233e886 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -1116,7 +1116,6 @@ void pc_memory_init(PCMachineState *pcms,
 
     if (machine->device_memory) {
         uint64_t *val = g_malloc(sizeof(*val));
-        PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);
         uint64_t res_mem_end = machine->device_memory->base;
 
         if (!pcmc->broken_reserved_end) {
diff --git a/hw/i386/x86.c b/hw/i386/x86.c
index f034df8bf6..b3d054889b 100644
--- a/hw/i386/x86.c
+++ b/hw/i386/x86.c
@@ -365,8 +365,6 @@ void x86_cpu_pre_plug(HotplugHandler *hotplug_dev,
 
     cpu_slot = x86_find_cpu_slot(MACHINE(x86ms), cpu->apic_id, &idx);
     if (!cpu_slot) {
-        MachineState *ms = MACHINE(x86ms);
-
         x86_topo_ids_from_apicid(cpu->apic_id, &topo_info, &topo_ids);
         error_setg(errp,
             "Invalid CPU [socket: %u, die: %u, core: %u, thread: %u] with"
-- 
2.39.3