alias u32 and u64 in userspace

[cengiz-io]

Hello

When I run ./gen_ioctls_list.sh on my x86_64 machine with v5.15 kernel,
it successfully detects the presence of linux/dma-buf.h header.

However, since those entries use u32 and u64 types from kernel space,
I get a compilation error:

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
      |                             ^~~~~~~~~~~~~~~~~~
make: *** [Makefile:22: ioctls_list.o] Error 1

Since typedefs are checked for collision during compilation, I think that
this is not a very ugly hack.

Any comments are welcome of course.

[jerome-pouiller]

It's a bug in the kernel. I have sent a patch solving the issue:
https://lore.kernel.org/all/[email protected]/

[jerome-pouiller]

In the past, I tried to find workaround for many of them. But it is a endless and complex job. If an ioctl does not compile, we can either blacklist it (there is a list in gen_ioctls_list.sh) or fix it in the Linux kernel. So I am going to reject your PR.