linux-kernel - [PATCH v2] ACPI/IORT: Fix GCC 12 warning

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Date:   Thu, 10 Feb 2022 10:47:31 -0800
From:   Victor Erminpour <victor.erminpour@...cle.com>
To:     lorenzo.pieralisi@....com
Cc:     guohanjun@...wei.com, sudeep.holla@....com, rafael@...nel.org,
        lenb@...nel.org, linux-acpi@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        trivial@...nel.org, victor.erminpour@...cle.com
Subject: [PATCH v2] ACPI/IORT: Fix GCC 12 warning

When building with automatic stack variable initialization, GCC 12
complains about variables defined outside of switch case statements.
Move the variable into the case that uses it, which silences the warning:

./drivers/acpi/arm64/iort.c:1670:59: error: statement will never be executed [-Werror=switch-unreachable]
  1670 |                         struct acpi_iort_named_component *ncomp;
       |                                                           ^~~~~

Signed-off-by: Victor Erminpour <victor.erminpour@...cle.com>
---
 drivers/acpi/arm64/iort.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index 3b23fb775ac4..65395f0decf9 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -1645,7 +1645,7 @@ void __init acpi_iort_init(void)
  */
 phys_addr_t __init acpi_iort_dma_get_max_cpu_address(void)
 {
-	phys_addr_t limit = PHYS_ADDR_MAX;
+	phys_addr_t local_limit, limit = PHYS_ADDR_MAX;
 	struct acpi_iort_node *node, *end;
 	struct acpi_table_iort *iort;
 	acpi_status status;
@@ -1667,17 +1667,16 @@ phys_addr_t __init acpi_iort_dma_get_max_cpu_address(void)
 			break;
 
 		switch (node->type) {
+		case ACPI_IORT_NODE_NAMED_COMPONENT: {
 			struct acpi_iort_named_component *ncomp;
-			struct acpi_iort_root_complex *rc;
-			phys_addr_t local_limit;
-
-		case ACPI_IORT_NODE_NAMED_COMPONENT:
 			ncomp = (struct acpi_iort_named_component *)node->node_data;
 			local_limit = DMA_BIT_MASK(ncomp->memory_address_limit);
 			limit = min_not_zero(limit, local_limit);
 			break;
 
-		case ACPI_IORT_NODE_PCI_ROOT_COMPLEX:
+		}
+		case ACPI_IORT_NODE_PCI_ROOT_COMPLEX: {
+			struct acpi_iort_root_complex *rc;
 			if (node->revision < 1)
 				break;
 
@@ -1686,6 +1685,7 @@ phys_addr_t __init acpi_iort_dma_get_max_cpu_address(void)
 			limit = min_not_zero(limit, local_limit);
 			break;
 		}
+		}
 		node = ACPI_ADD_PTR(struct acpi_iort_node, node, node->length);
 	}
 	acpi_put_table(&iort->header);