On Mon, Mar 30, 2026 at 10:29:48PM -0700, Andrew Morton wrote: > 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.
No worries, we can hang this one as well. Let me send to kbuild ML with the two valid fix (1/4, 4/4), I will reformat them. -- Regards, Li Wang
