linux-kernel - [PATCH 2/3] uio: Fix build failure on 32 bit builds with 64 bit physaddr

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Message-Id: <20240323144228.3924542-2-linux@roeck-us.net>
Date: Sat, 23 Mar 2024 07:42:27 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-kernel@...r.kernel.org,
	Nilesh Javali <njavali@...vell.com>,
	Christoph Hellwig <hch@....de>,
	Guenter Roeck <linux@...ck-us.net>,
	Chris Leech <cleech@...hat.com>
Subject: [PATCH 2/3] uio: Fix build failure on 32 bit builds with 64 bit physaddr

Builds on 32-bit systems with 64 bit physical address fail with

drivers/uio/uio.c: In function 'uio_mmap_dma_coherent':
drivers/uio/uio.c:795:16: error:
	cast to pointer from integer of different size

The conversion itself is safe since sizeof(phys_addr_t) it in general equal
to or larger than sizeof(void *). Solve the problem by double-casting the
conversion.

Fixes: 576882ef5e7f ("uio: introduce UIO_MEM_DMA_COHERENT type")
Cc: Chris Leech <cleech@...hat.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 drivers/uio/uio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index bb77de6fa067..1935b0f16477 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -792,7 +792,7 @@ static int uio_mmap_dma_coherent(struct vm_area_struct *vma)
 	 */
 	vma->vm_pgoff = 0;
 
-	addr = (void *)mem->addr;
+	addr = (void *)(unsigned long)mem->addr;
 	ret = dma_mmap_coherent(mem->dma_device,
 				vma,
 				addr,
-- 
2.39.2