EDAC, altera: Work around int-to-pointer-cast warnings

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>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Thor Thayer <thor.thayer@linux.intel.com>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: David Frey <dpfrey@gmail.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Cc: linux-edac@vger.kernel.org
Link: https://lkml.kernel.org/r/20180927100949.973078-1-arnd@arndb.de

diff --git a/drivers/edac/altera_edac.c b/drivers/edac/altera_edac.c
index 523ae84..4324a00 100644 (file)
--- a/drivers/edac/altera_edac.c
+++ b/drivers/edac/altera_edac.c
@@ -1035,7 +1035,7 @@ 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);
@@ -1049,9 +1049,9 @@ 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);
@@ -2044,7 +2044,7 @@ 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);
@@ -2058,9 +2058,10 @@ 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);
        }