linux-kernel - Re: [PATCH 3/3] of: fix sparse warnings in fdt, irq, and resolver code

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Date:   Thu, 4 May 2017 22:16:40 -0700
From:   Frank Rowand <frowand.list@...il.com>
To:     Rob Herring <robh@...nel.org>, devicetree@...r.kernel.org,
        Mark Rutland <mark.rutland@....com>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] of: fix sparse warnings in fdt, irq, and resolver
 code

On 05/04/17 11:00, Rob Herring wrote:
> sparse generates the following warnings in drivers/of/:
> 
> ../drivers/of/fdt.c:63:36: warning: cast to restricted __be32
> ../drivers/of/fdt.c:68:33: warning: cast to restricted __be32
> ../drivers/of/irq.c:105:88: warning: incorrect type in initializer (different base types)
> ../drivers/of/irq.c:105:88:    expected restricted __be32
> ../drivers/of/irq.c:105:88:    got int
> ../drivers/of/irq.c:526:35: warning: incorrect type in assignment (different modifiers)
> ../drivers/of/irq.c:526:35:    expected int ( *const [usertype] irq_init_cb )( ... )
> ../drivers/of/irq.c:526:35:    got void const *const data
> ../drivers/of/resolver.c:95:42: warning: incorrect type in assignment (different base types)
> ../drivers/of/resolver.c:95:42:    expected unsigned int [unsigned] [usertype] <noident>
> ../drivers/of/resolver.c:95:42:    got restricted __be32 [usertype] <noident>
> 
> All these are harmless type mismatches fixed by adjusting the types.
> 
> Signed-off-by: Rob Herring <robh@...nel.org>
> ---
>  drivers/of/fdt.c       | 4 ++--
>  drivers/of/irq.c       | 2 +-
>  drivers/of/resolver.c  | 2 +-
>  include/linux/of_irq.h | 2 +-
>  4 files changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
> index e33f7818bc6c..a0972219ccfc 100644
> --- a/drivers/of/fdt.c
> +++ b/drivers/of/fdt.c
> @@ -48,8 +48,8 @@ void of_fdt_limit_memory(int limit)
>  	const void *val;
>  	int nr_address_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT;
>  	int nr_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT;
> -	const uint32_t *addr_prop;
> -	const uint32_t *size_prop;
> +	const __be32 *addr_prop;
> +	const __be32 *size_prop;
>  	int root_offset;
>  	int cell_size;
>  
> diff --git a/drivers/of/irq.c b/drivers/of/irq.c
> index 7c56b72d1dc6..d11437cb1187 100644
> --- a/drivers/of/irq.c
> +++ b/drivers/of/irq.c
> @@ -102,7 +102,7 @@ int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq)
>  	struct device_node *ipar, *tnode, *old = NULL, *newpar = NULL;
>  	__be32 initial_match_array[MAX_PHANDLE_ARGS];
>  	const __be32 *match_array = initial_match_array;
> -	const __be32 *tmp, *imap, *imask, dummy_imask[] = { [0 ... MAX_PHANDLE_ARGS] = ~0 };
> +	const __be32 *tmp, *imap, *imask, dummy_imask[] = { [0 ... MAX_PHANDLE_ARGS] = cpu_to_be32(~0) };
>  	u32 intsize = 1, addrsize, newintsize = 0, newaddrsize = 0;
>  	int imaplen, match, i, rc = -EINVAL;
>  
> diff --git a/drivers/of/resolver.c b/drivers/of/resolver.c
> index 7ae9863cb0a4..771f4844c781 100644
> --- a/drivers/of/resolver.c
> +++ b/drivers/of/resolver.c
> @@ -92,7 +92,7 @@ static void adjust_overlay_phandles(struct device_node *overlay,
>  		if (phandle == OF_PHANDLE_ILLEGAL)
>  			continue;
>  
> -		*(uint32_t *)prop->value = cpu_to_be32(overlay->phandle);
> +		*(__be32 *)prop->value = cpu_to_be32(overlay->phandle);
>  	}
>  
>  	for_each_child_of_node(overlay, child)
> diff --git a/include/linux/of_irq.h b/include/linux/of_irq.h
> index 1e0deb8e8494..ec6b11deb773 100644
> --- a/include/linux/of_irq.h
> +++ b/include/linux/of_irq.h
> @@ -8,7 +8,7 @@
>  #include <linux/ioport.h>
>  #include <linux/of.h>
>  
> -typedef int (*of_irq_init_cb_t)(struct device_node *, struct device_node *);
> +typedef int const (*of_irq_init_cb_t)(struct device_node *, struct device_node *);
>  
>  /*
>   * Workarounds only applied to 32bit powermac machines
> 

Reviewed-by: Frank Rowand <frank.rowand@...y.com>