uio_pdrv_genirq: Allow use with non-page-aligned memory resources

Similar to the changes made in 270579d95f82 ("uio_mf624: Align memory
regions to page size and set correct offsets"), this will allow
uio_pdrv_genirq devices to expose memory regions that is not page-aligned,
requiring the users to respect the offset sysfs attribute (as implemented
in libuio).

Signed-off-by: Esben Haabendal <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/uio/uio_pdrv_genirq.c

···
 		}
 
 		uiomem->memtype = UIO_MEM_PHYS;
-		uiomem->addr = r->start;
-		uiomem->size = resource_size(r);
+		uiomem->addr = r->start & PAGE_MASK;
+		uiomem->offs = r->start & ~PAGE_MASK;
+		uiomem->size = (uiomem->offs + resource_size(r)
+				+ PAGE_SIZE - 1) & PAGE_MASK;
 		uiomem->name = r->name;
 		++uiomem;
 	}