On Tue, 31 Mar 2026 12:01:54 +0800 Li Wang <[email protected]> wrote:
> The mm selftests generate both local_config.mk and local_config.h from > check_config.sh. With high parallelism (-jN), this can race and lead to > incomplete target builds (e.g. only a few binaries get built after > 'make -j100', while 'make -j1' builds everything). > > Switch to a stamp-based dependency: > > local_config.stamp: check_config.sh > ... run check_config.sh ... > touch local_config.stamp > > and make local_config.mk/local_config.h depend on the stamp. > > This ensures check_config.sh is executed once per update decision and > removes the parallel race window. Also hook local_config.stamp into > EXTRA_CLEAN. > > No functional change intended for non-parallel builds. > > Reported-by: Andrew Morton <[email protected]> Well, the wind changed direction. I saw this race a single time today but now I'm trying to produce a reliable before-and-after report, it isn't cooperating - everything is now building with -j100 with and without this patch. So not very helpful, sorry.
