Re: [PATCH] selftests:dma: Fix compile error in user-space tool

[Gerd Bayer <gbayer@linux.ibm.com>]

On Thu, 2023-01-12 at 13:36 -0700, Shuah Khan wrote:
> On 1/9/23 11:07, Gerd Bayer wrote:
> > With this change dma_map_benchmark compiles with just the obvious
> > warning
> > about uapi usage on ARCH=x86, arm64, and s390 and runs on
> > ARCH=s390.
> 
> On Linux 6.2-rc3, dma_map_benchmark compiles just fine. You do
> have to do "make headers_install" first as kselftest depends
> on headers being installed in the repo.
> 
> Please let me know if you are seeing compile problems even after
> installing headers.
> 
> thanks,
> -- Shuah

Hi Shuah,

thank you for this clarification. Once I run "make headers_install"
before attempting to build the dma_benchmark_test executable with
  make -C tools/testing/selftests/ TARGETS="dma"
everything works out nicely - even w/o my patch.

I have to apologize for creating this fuzz. I was not aware that one of
the dependencies for "make kselftest" was "make headers_install", since
I was going straight for the interactive "dma_benchmark_test" control
tool of the test that is implemented in kernel/dma/benchmark_test.c.
I didn't intend to run the full "make kselftest" suite, primarily since
I have distinct test and build systems - most often building cross-
arch, even.

So please, disregard the PATCH.

Thank you,
Gerd