linux-kernel - Re: [PATCH] powerpc/476: Fix sparse report

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Message-ID: <1998989.TeVrErrrU0@cleo>
Date:   Tue, 21 Sep 2021 10:38:36 +1000
From:   Alistair Popple <alistair@...ple.id.au>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     Christophe Leroy <christophe.leroy@...roup.eu>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH] powerpc/476: Fix sparse report

Thanks, looks reasonable.

Reviewed-by: Alistair Popple <alistair@...ple.id.au>

On Saturday, 18 September 2021 7:22:32 PM AEST Christophe Leroy wrote:
> 	arch/powerpc/platforms/44x/ppc476.c:236:17: warning: cast removes address space '__iomem' of expression
> 	arch/powerpc/platforms/44x/ppc476.c:241:34: warning: incorrect type in argument 1 (different address spaces)
> 	arch/powerpc/platforms/44x/ppc476.c:241:34:    expected void const volatile [noderef] __iomem *addr
> 	arch/powerpc/platforms/44x/ppc476.c:241:34:    got unsigned char [usertype] *
> 	arch/powerpc/platforms/44x/ppc476.c:243:17: warning: incorrect type in argument 1 (different address spaces)
> 	arch/powerpc/platforms/44x/ppc476.c:243:17:    expected void volatile [noderef] __iomem *addr
> 	arch/powerpc/platforms/44x/ppc476.c:243:17:    got unsigned char [usertype] *[assigned] fpga
> 
> Mark 'fpga' pointer as __iomem.
> 
> Reported-by: kernel test robot <lkp@...el.com>
> Fixes: ab9a4183fddf ("powerpc: Update currituck pci/usb fixup for new board revision")
> Cc: Alistair Popple <alistair@...ple.id.au>
> Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
> ---
>  arch/powerpc/platforms/44x/ppc476.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/powerpc/platforms/44x/ppc476.c b/arch/powerpc/platforms/44x/ppc476.c
> index 07f7e3ce67b5..fb7db5cedd4e 100644
> --- a/arch/powerpc/platforms/44x/ppc476.c
> +++ b/arch/powerpc/platforms/44x/ppc476.c
> @@ -219,7 +219,7 @@ static int board_rev = -1;
>  static int __init ppc47x_get_board_rev(void)
>  {
>  	int reg;
> -	u8 *fpga;
> +	u8 __iomem *fpga;
>  	struct device_node *np = NULL;
>  
>  	if (of_machine_is_compatible("ibm,currituck")) {
> @@ -233,7 +233,7 @@ static int __init ppc47x_get_board_rev(void)
>  	if (!np)
>  		goto fail;
>  
> -	fpga = (u8 *) of_iomap(np, 0);
> +	fpga = of_iomap(np, 0);
>  	of_node_put(np);
>  	if (!fpga)
>  		goto fail;
>