On Thu, 10 Feb 2022 at 01:34, Victor Erminpour
<victor.erminpour@xxxxxxxxxx> 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;
> | ^~~~~
>
> Signed-off-by: Victor Erminpour <victor.erminpour@xxxxxxxxxx>
GCC 12 is not released yet, and this is clearly a compiler bug (a
declaration is not a statement, and the hidden offending statement
[the zero-init] is emitted by the compiler itself), so please report
this to the GCC folks instead.
> ---
> 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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