Re: [RFC PATCH v1 03/21] RISC-V: ACPI: Fix acpi_os_ioremap to return iomem address

[Andrew Jones]

On Thu, Aug 03, 2023 at 11:28:58PM +0530, Sunil V L wrote:
> acpi_os_ioremap() currently is a wrapper to memremap() on
> RISC-V. But the callers of acpi_os_ioremap() expect it to
> return __iomem address and hence sparse tool reports a new
> warning. Fix this issue by type casting to  __iomem type.
> 
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
> Closes: https://lore.kernel.org/oe-kbuild-all/202307230357.egcTAefj-lkp@xxxxxxxxx/
> Fixes: a91a9ffbd3a5 ("RISC-V: Add support to build the ACPI core")
> Signed-off-by: Sunil V L <sunilvl@xxxxxxxxxxxxxxxx>
> ---
>  arch/riscv/include/asm/acpi.h | 2 +-
>  arch/riscv/kernel/acpi.c      | 4 ++--
>  2 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/riscv/include/asm/acpi.h b/arch/riscv/include/asm/acpi.h
> index f71ce21ff684..d5604d2073bc 100644
> --- a/arch/riscv/include/asm/acpi.h
> +++ b/arch/riscv/include/asm/acpi.h
> @@ -19,7 +19,7 @@ typedef u64 phys_cpuid_t;
>  #define PHYS_CPUID_INVALID INVALID_HARTID
>  
>  /* ACPI table mapping after acpi_permanent_mmap is set */
> -void *acpi_os_ioremap(acpi_physical_address phys, acpi_size size);
> +void __iomem *acpi_os_ioremap(acpi_physical_address phys, acpi_size size);
>  #define acpi_os_ioremap acpi_os_ioremap
>  
>  #define acpi_strict 1	/* No out-of-spec workarounds on RISC-V */
> diff --git a/arch/riscv/kernel/acpi.c b/arch/riscv/kernel/acpi.c
> index 5ee03ebab80e..56cb2c986c48 100644
> --- a/arch/riscv/kernel/acpi.c
> +++ b/arch/riscv/kernel/acpi.c
> @@ -215,9 +215,9 @@ void __init __acpi_unmap_table(void __iomem *map, unsigned long size)
>  	early_iounmap(map, size);
>  }
>  
> -void *acpi_os_ioremap(acpi_physical_address phys, acpi_size size)
> +void __iomem *acpi_os_ioremap(acpi_physical_address phys, acpi_size size)
>  {
> -	return memremap(phys, size, MEMREMAP_WB);
> +	return (void __iomem *)memremap(phys, size, MEMREMAP_WB);
>  }
>  
>  #ifdef CONFIG_PCI
> -- 
> 2.39.2
>

Reviewed-by: Andrew Jones <ajones@xxxxxxxxxxxxxxxx>