[PATCH] EDAC, altera: work around int-to-pointer-cast warnings

[PATCH] EDAC, altera: work around int-to-pointer-cast warnings

[Arnd Bergmann]

The altera edac driver passes a token from a DT resource as
resource_size_t into an SMC call, but casts it to an __iomem pointer
and then a plain void pointer inbetween, mixing three or four
incompatible types in the process. The compiler complains about
one of the conversions:

drivers/edac/altera_edac.c: In function 'altr_init_a10_ecc_block':
drivers/edac/altera_edac.c:1053:10: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
   base = (void __iomem *)res.start;
          ^
drivers/edac/altera_edac.c: In function 'altr_edac_a10_probe':
drivers/edac/altera_edac.c:2062:10: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
   base = (void __iomem *)res.start;

Using a static checker probably also notices the __iomem cast.  Solving
this properly isn't trivial, but simply casting to a 'uintptr_t' instead
of 'void __iomem *' makes it less wrong and should avoid the warnings.

Fixes: d5fc9125566c ("EDAC, altera: Combine Stratix10 and Arria10 probe functions")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/edac/altera_edac.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/edac/altera_edac.c b/drivers/edac/altera_edac.c
index 0e9e80789d99..c89d82aa2776 100644
--- a/drivers/edac/altera_edac.c
+++ b/drivers/edac/altera_edac.c
@@ -1036,7 +1036,7 @@ altr_init_a10_ecc_block(struct device_node *np, u32 irq_mask,
 	} else {
 		struct device_node *sysmgr_np;
 		struct resource res;
-		void __iomem *base;
+		uintptr_t base;
 
 		sysmgr_np = of_parse_phandle(np_eccmgr,
 					     "altr,sysmgr-syscon", 0);
@@ -1050,9 +1050,9 @@ altr_init_a10_ecc_block(struct device_node *np, u32 irq_mask,
 			return -ENOMEM;
 
 		/* Need physical address for SMCC call */
-		base = (void __iomem *)res.start;
+		base = res.start;
 
-		ecc_mgr_map = regmap_init(NULL, NULL, base,
+		ecc_mgr_map = regmap_init(NULL, NULL, (void *)base,
 					  &s10_sdram_regmap_cfg);
 	}
 	of_node_put(np_eccmgr);
@@ -2045,7 +2045,7 @@ static int altr_edac_a10_probe(struct platform_device *pdev)
 	} else {
 		struct device_node *sysmgr_np;
 		struct resource res;
-		void __iomem *base;
+		uintptr_t base;
 
 		sysmgr_np = of_parse_phandle(pdev->dev.of_node,
 					     "altr,sysmgr-syscon", 0);
@@ -2059,9 +2059,10 @@ static int altr_edac_a10_probe(struct platform_device *pdev)
 			return -ENOMEM;
 
 		/* Need physical address for SMCC call */
-		base = (void __iomem *)res.start;
+		base = res.start;
 
-		edac->ecc_mgr_map = devm_regmap_init(&pdev->dev, NULL, base,
+		edac->ecc_mgr_map = devm_regmap_init(&pdev->dev, NULL,
+						     (void *)base,
 						     &s10_sdram_regmap_cfg);
 	}
 
-- 
2.18.0

Re: [PATCH] EDAC, altera: work around int-to-pointer-cast warnings

[Thor Thayer]

Hi Arnd,

On 09/27/2018 05:09 AM, Arnd Bergmann wrote:
> The altera edac driver passes a token from a DT resource as
> resource_size_t into an SMC call, but casts it to an __iomem pointer
> and then a plain void pointer inbetween, mixing three or four
> incompatible types in the process. The compiler complains about
> one of the conversions:
> 
> drivers/edac/altera_edac.c: In function 'altr_init_a10_ecc_block':
> drivers/edac/altera_edac.c:1053:10: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
>     base = (void __iomem *)res.start;
>            ^
> drivers/edac/altera_edac.c: In function 'altr_edac_a10_probe':
> drivers/edac/altera_edac.c:2062:10: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
>     base = (void __iomem *)res.start;
> 
> Using a static checker probably also notices the __iomem cast.  Solving
> this properly isn't trivial, but simply casting to a 'uintptr_t' instead
> of 'void __iomem *' makes it less wrong and should avoid the warnings.
> 
> Fixes: d5fc9125566c ("EDAC, altera: Combine Stratix10 and Arria10 probe functions")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>   drivers/edac/altera_edac.c | 13 +++++++------
>   1 file changed, 7 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/edac/altera_edac.c b/drivers/edac/altera_edac.c
> index 0e9e80789d99..c89d82aa2776 100644
> --- a/drivers/edac/altera_edac.c
> +++ b/drivers/edac/altera_edac.c
> @@ -1036,7 +1036,7 @@ altr_init_a10_ecc_block(struct device_node *np, u32 irq_mask,
>   	} else {
>   		struct device_node *sysmgr_np;
>   		struct resource res;
> -		void __iomem *base;
> +		uintptr_t base;
>   
>   		sysmgr_np = of_parse_phandle(np_eccmgr,
>   					     "altr,sysmgr-syscon", 0);
> @@ -1050,9 +1050,9 @@ altr_init_a10_ecc_block(struct device_node *np, u32 irq_mask,
>   			return -ENOMEM;
>   
>   		/* Need physical address for SMCC call */
> -		base = (void __iomem *)res.start;
> +		base = res.start;
>   
> -		ecc_mgr_map = regmap_init(NULL, NULL, base,
> +		ecc_mgr_map = regmap_init(NULL, NULL, (void *)base,
>   					  &s10_sdram_regmap_cfg);
>   	}
>   	of_node_put(np_eccmgr);
> @@ -2045,7 +2045,7 @@ static int altr_edac_a10_probe(struct platform_device *pdev)
>   	} else {
>   		struct device_node *sysmgr_np;
>   		struct resource res;
> -		void __iomem *base;
> +		uintptr_t base;
>   
>   		sysmgr_np = of_parse_phandle(pdev->dev.of_node,
>   					     "altr,sysmgr-syscon", 0);
> @@ -2059,9 +2059,10 @@ static int altr_edac_a10_probe(struct platform_device *pdev)
>   			return -ENOMEM;
>   
>   		/* Need physical address for SMCC call */
> -		base = (void __iomem *)res.start;
> +		base = res.start;
>   
> -		edac->ecc_mgr_map = devm_regmap_init(&pdev->dev, NULL, base,
> +		edac->ecc_mgr_map = devm_regmap_init(&pdev->dev, NULL,
> +						     (void *)base,
>   						     &s10_sdram_regmap_cfg);
>   	}
>   
Thanks for the fix.

Reviewed-by: Thor Thayer <thor.thayer@linux.intel.com>

Re: [PATCH] EDAC, altera: work around int-to-pointer-cast warnings

[Borislav Petkov]

On Thu, Sep 27, 2018 at 12:09:26PM +0200, Arnd Bergmann wrote:
> The altera edac driver passes a token from a DT resource as
> resource_size_t into an SMC call, but casts it to an __iomem pointer
> and then a plain void pointer inbetween, mixing three or four
> incompatible types in the process. The compiler complains about
> one of the conversions:
> 
> drivers/edac/altera_edac.c: In function 'altr_init_a10_ecc_block':
> drivers/edac/altera_edac.c:1053:10: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
>    base = (void __iomem *)res.start;
>           ^
> drivers/edac/altera_edac.c: In function 'altr_edac_a10_probe':
> drivers/edac/altera_edac.c:2062:10: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
>    base = (void __iomem *)res.start;
> 
> Using a static checker probably also notices the __iomem cast.  Solving
> this properly isn't trivial, but simply casting to a 'uintptr_t' instead
> of 'void __iomem *' makes it less wrong and should avoid the warnings.
> 
> Fixes: d5fc9125566c ("EDAC, altera: Combine Stratix10 and Arria10 probe functions")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>  drivers/edac/altera_edac.c | 13 +++++++------
>  1 file changed, 7 insertions(+), 6 deletions(-)

Applied, thanks.

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.