On Fri, 23 Nov 2018 15:33:21 +0000 Mark Rutland <mark.rutl...@arm.com> wrote:
> Andrew and Ingo report that the check-atomics.sh script is simply too > slow to run for every kernel build, and it's impractical to make it > faster without rewriting it in something other than shell. > > Rather than committing the generated headers, let's regenerate these > as-required for a pristine tree. > > That ensures they're always up-to-date, allows them to be built in > parallel, and avoid redundant rebuilds, which is a 2-8s saving per > incremental build. Since the results are not committed, it's very > obvious that they should not be modified directly. If we need to > generate more headers in future, it's easy to extend Makefile.genheader > to permit this. > > I've verified that this works in the cases we previously had issues with > (out-of-tree builds and where scripts have no execute permissions), and > have tested these cases for both x86_64 and arm64. Seems like a reasonable compromise. I'll take a copy for testing now, shall drop that when this appears in tip->linux-next.