On 2022-02-10 00:32, Victor Erminpour wrote:
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;
| ^~~~~
Notwithstanding the fact that that warning is nonsensical, this patch
changes valid C code into invalid C code that doesn't even compile:
drivers/acpi/arm64/iort.c: In function ‘acpi_iort_dma_get_max_cpu_address’:
drivers/acpi/arm64/iort.c:1669:4: error: a label can only be part of a
statement and a declaration is not a statement
1669 | struct acpi_iort_named_component *ncomp;
| ^~~~~~
drivers/acpi/arm64/iort.c:1676:4: error: a label can only be part of a
statement and a declaration is not a statement
1676 | struct acpi_iort_root_complex *rc;
| ^~~~~~
Robin.
Signed-off-by: Victor Erminpour <victor.erminpour@xxxxxxxxxx>
---
drivers/acpi/arm64/iort.c | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)
diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index 3b23fb775ac4..5c5d2e56d756 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 +1667,15 @@ phys_addr_t __init acpi_iort_dma_get_max_cpu_address(void)
break;
switch (node->type) {
- struct acpi_iort_named_component *ncomp;
- struct acpi_iort_root_complex *rc;
- phys_addr_t local_limit;
-
case ACPI_IORT_NODE_NAMED_COMPONENT:
+ struct acpi_iort_named_component *ncomp;
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:
+ struct acpi_iort_root_complex *rc;
if (node->revision < 1)
break;
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