linux-kernel - [PATCH] dma-buf: fix use of DMA_BUF_SET_NAME

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Message-Id: <20220517072708.245265-1-Jerome.Pouiller@silabs.com>
Date:   Tue, 17 May 2022 09:27:08 +0200
From:   Jerome Pouiller <Jerome.Pouiller@...abs.com>
To:     Daniel Vetter <daniel.vetter@...ll.ch>,
        Christian König <christian.koenig@....com>,
        Jason Ekstrand <jason@...kstrand.net>,
        Pekka Paalanen <pekka.paalanen@...labora.com>
Cc:     linux-kernel@...r.kernel.org,
        Jérôme Pouiller 
        <jerome.pouiller@...abs.com>
Subject: [PATCH] dma-buf: fix use of DMA_BUF_SET_NAME_{A,B} in userspace

From: Jérôme Pouiller <jerome.pouiller@...abs.com>

The typedefs u32 and u64 are not available in userspace. Thus user get
an error he try to use DMA_BUF_SET_NAME_A or DMA_BUF_SET_NAME_B:

    $ gcc -Wall   -c -MMD -c -o ioctls_list.o ioctls_list.c
    In file included from /usr/include/x86_64-linux-gnu/asm/ioctl.h:1,
                     from /usr/include/linux/ioctl.h:5,
                     from /usr/include/asm-generic/ioctls.h:5,
                     from ioctls_list.c:11:
    ioctls_list.c:463:29: error: ‘u32’ undeclared here (not in a function)
      463 |     { "DMA_BUF_SET_NAME_A", DMA_BUF_SET_NAME_A, -1, -1 }, // linux/dma-buf.h
          |                             ^~~~~~~~~~~~~~~~~~
    ioctls_list.c:464:29: error: ‘u64’ undeclared here (not in a function)
      464 |     { "DMA_BUF_SET_NAME_B", DMA_BUF_SET_NAME_B, -1, -1 }, // linux/dma-buf.h
          |                             ^~~~~~~~~~~~~~~~~~

The issue was initially reported here[1].

[1]: https://github.com/jerome-pouiller/ioctl/pull/14

Signed-off-by: Jérôme Pouiller <jerome.pouiller@...abs.com>
---
 include/uapi/linux/dma-buf.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/uapi/linux/dma-buf.h b/include/uapi/linux/dma-buf.h
index 8e4a2ca0bcbf..b1523cb8ab30 100644
--- a/include/uapi/linux/dma-buf.h
+++ b/include/uapi/linux/dma-buf.h
@@ -92,7 +92,7 @@ struct dma_buf_sync {
  * between them in actual uapi, they're just different numbers.
  */
 #define DMA_BUF_SET_NAME	_IOW(DMA_BUF_BASE, 1, const char *)
-#define DMA_BUF_SET_NAME_A	_IOW(DMA_BUF_BASE, 1, u32)
-#define DMA_BUF_SET_NAME_B	_IOW(DMA_BUF_BASE, 1, u64)
+#define DMA_BUF_SET_NAME_A	_IOW(DMA_BUF_BASE, 1, __u32)
+#define DMA_BUF_SET_NAME_B	_IOW(DMA_BUF_BASE, 1, __u64)
 
 #endif
-- 
2.35.1