Define _GNU_SOURCE for sources using

[bjoto]

Pull request for series with
subject: Define _GNU_SOURCE for sources using
version: 3
url: https://patchwork.kernel.org/project/linux-riscv/list/?series=852027

[bjoto]

Upstream branch: 6beb6bc
series: https://patchwork.kernel.org/project/linux-riscv/list/?series=852027
version: 3

Pull request is NOT updated. Failed to apply https://patchwork.kernel.org/project/linux-riscv/list/?series=852027
error message:

Cmd('git') failed due to: exit code(128)
  cmdline: git am -s --3way
  stdout: 'Applying: selftests: Compile kselftest headers with -D_GNU_SOURCE
Patch failed at 0001 selftests: Compile kselftest headers with -D_GNU_SOURCE
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".'
  stderr: 'error: sha1 information is lacking or useless (tools/testing/selftests/Makefile).
error: could not build fake ancestor
hint: Use 'git am --show-current-patch=diff' to see the failed patch'

conflict: