On 2026-10-11 19:36:43-0400, Sasha Levin wrote: > Add a "Kernel selftests" sub-menu with one entry per selftests directory > that builds with only a C library and does not write into the source > tree. Each is built as "make kselftest-all" builds it, with KHDR_INCLUDES > pointing at the UAPI headers installed in the object tree, but by its own > make, so the selected ones build in parallel. Selftests whose Makefile > does not use KHDR_INCLUDES still build against the C library's copy of > the UAPI headers. > > The selftests do not track header dependencies, so a selftest is built > again from scratch when its own directory, a header or makefile any > selftest may share, or a kernel source it includes directly (the vDSO > test includes the architecture's vDSO code) is newer than its last > build. > > Selftests that need libraries beyond the C library, a vmlinux with BTF, > or a sanitizer runtime are left out for now. > > Assisted-by: LLM > Signed-off-by: Sasha Levin <[email protected]> > --- > tools/Kconfig | 239 ++++++++++++++++++++++++++++++++++++++++++ > tools/Makefile.kbuild | 100 ++++++++++++++++++ > 2 files changed, 339 insertions(+)
(...) > diff --git a/tools/Makefile.kbuild b/tools/Makefile.kbuild > index 62fd494253eca..c31347258d0a9 100644 > --- a/tools/Makefile.kbuild > +++ b/tools/Makefile.kbuild > @@ -92,6 +92,106 @@ PHONY += perf > perf: FORCE > $(call build,$(outdir)/perf,-C $(toolsdir)/perf -f Makefile.perf > O=$(outdir)/perf $(perf-flags) $(perf-flags-y),,TOOLS_BUILD_PERF) (...) > +# Unlike tools/build, the selftests do not track header dependencies. A > +# selftest is built again from scratch when its own directory, a header or > +# makefile any selftest may share, or a kernel source it includes directly > +# is newer than its last build. > +selftest-shared := $(outdir)/selftests/.shared > +selftest-extra-vDSO := $(abs_srctree)/arch/$(SRCARCH) Can we not fix the selftests to properly track header dependencies? That has been an annoyance of mine for quite some time. It would also get rid of a whole bunch of hackery here. (...)
