linux-kernel - [PATCH 6/8] uio: Pass pointers to virt_to

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Date:	Wed, 21 Dec 2011 01:36:33 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	"Hans J. Koch" <hjk@...sjkoch.de>,
	Greg Kroah-Hartman <gregkh@...e.de>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 6/8] uio: Pass pointers to virt_to_page(), not integers

Most architectures define virt_to_page() as a macro that casts its
argument such that an argument of type unsigned long will be accepted
without complaint.  However, the proper type is void *, and passing
unsigned long results in a warning on MIPS.

Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
It might be clearer to assign:

	addr = (void *)((unsigned long)idev->info->mem[mi].addr + offset);

since arithmetic on void pointers is weird.  Either way should work though.

Ben.

 drivers/uio/uio.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index a783d53..1ff7927 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -620,6 +620,7 @@ static int uio_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 	struct uio_device *idev = vma->vm_private_data;
 	struct page *page;
 	unsigned long offset;
+	void *addr;
 
 	int mi = uio_find_mem_index(vma);
 	if (mi < 0)
@@ -631,10 +632,11 @@ static int uio_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 	 */
 	offset = (vmf->pgoff - mi) << PAGE_SHIFT;
 
+	addr = (void *)(unsigned long)idev->info->mem[mi].addr + offset;
 	if (idev->info->mem[mi].memtype == UIO_MEM_LOGICAL)
-		page = virt_to_page(idev->info->mem[mi].addr + offset);
+		page = virt_to_page(addr);
 	else
-		page = vmalloc_to_page((void *)(unsigned long)idev->info->mem[mi].addr + offset);
+		page = vmalloc_to_page(addr);
 	get_page(page);
 	vmf->page = page;
 	return 0;
-- 
1.7.7.3



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