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Date:   Mon, 24 Jul 2023 11:32:38 +0100
From:   Conor Dooley <conor.dooley@microchip.com>
To:     Sunil V L <sunilvl@ventanamicro.com>
CC:     <linux-riscv@lists.infradead.org>, <linux-kernel@vger.kernel.org>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Andrew Jones <ajones@ventanamicro.com>,
        kernel test robot <lkp@intel.com>
Subject: Re: [PATCH v3 -fixes] RISC-V: ACPI: Fix acpi_os_ioremap to return
 iomem address
Message-ID: <20230724-zit-stunning-901bfd989a4a@wendy>
References: <20230724100346.1302937-1-sunilvl@ventanamicro.com>
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On Mon, Jul 24, 2023 at 03:33:46PM +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.
>=20
> Reported-by: kernel test robot <lkp@intel.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202307230357.egcTAefj-lkp@i=
ntel.com/
> Fixes: a91a9ffbd3a5 ("RISC-V: Add support to build the ACPI core")
> Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
> ---

Surprisingly, my automation already tested this patch. Usually there's a
several hour delay between posting & testing.

Reviewed-by: Conor Dooley <conor.dooley@microchip.com>

Thanks,
Conor.

> Changes since v2:
> 	1) Removed unnecessary __force.
> 	2) Removed unnecessary space after cast to fix checkpatch --strict warni=
ng.
>=20
> Changes since v1:
> 	1) Removed enhancements from the fix patch.
>=20
>  arch/riscv/include/asm/acpi.h | 2 +-
>  arch/riscv/kernel/acpi.c      | 4 ++--
>  2 files changed, 3 insertions(+), 3 deletions(-)
>=20
> 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
> =20
>  /* 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
> =20
>  #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, uns=
igned long size)
>  	early_iounmap(map, size);
>  }
> =20
> -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);
>  }
> =20
>  #ifdef CONFIG_PCI
> --=20
> 2.39.2
>=20

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