On Thu, May 28, 2015 at 3:35 PM, Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx> wrote: > Even though we use ioremap_nocache() to map our persistent memory in the > pmem driver, the memory we are mapping behaves like normal memory and > not I/O memory in that it can be accessed using regular memcpy() > operations and doesn't need to go through memcpy_toio() and > memcpy_fromio(). Force casting the pointers received from > ioremap_nocache() and given to iounmap() gives us the correct behavior > and makes sparse happy. > > Signed-off-by: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx> > Cc: Dan Williams <dan.j.williams@xxxxxxxxx> > Cc: linux-nvdimm@xxxxxxxxxxxx > --- > drivers/block/nd/pmem.c | 7 ++++--- > 1 file changed, 4 insertions(+), 3 deletions(-) > > diff --git a/drivers/block/nd/pmem.c b/drivers/block/nd/pmem.c > index 5e8c9c629f22..a8712e41e7f5 100644 > --- a/drivers/block/nd/pmem.c > +++ b/drivers/block/nd/pmem.c > @@ -163,7 +163,8 @@ static struct pmem_device *pmem_alloc(struct device *dev, struct resource *res, > * of the CPU caches in case of a crash. > */ > err = -ENOMEM; > - pmem->virt_addr = ioremap_nocache(pmem->phys_addr, pmem->size); > + pmem->virt_addr = (__force void *)ioremap_nocache(pmem->phys_addr, > + pmem->size); I think I'd rather see casting when ->virt_addr is used (the __io_virt() helper can be used to make this a tad cleaner), or provide ioremap apis that don't attach __iomem to their return value. Because in this and other cases ioremap() is being on non "i/o" memory. -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
