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When building ynltool with parallel make (-jN), a warning is emitted: make[1]: warning: jobserver unavailable: using -j1. Add '+' to parent make rule. The warning trips up local runs of NIPA's ingest_mdir.py, which correctly fails on make warnings. This occurs because SRC_VERSION uses $(shell make ...) to make kernelversion. The $(shell) function inherits make's MAKEFLAGS env var which specifies "--jobserver-auth=R,W" pointing to file descriptors that the invoked make sub-shell does not have access to. Observed with: $ make --version | head -1 GNU Make 4.3 Instead of suppressing MAKEFLAGS and foregoing all future MAKEFLAGS (some of which may be desirable, such as variable overrides) or introducing a new make target, we instead just ignore the warning by piping stderr to /dev/null. If 'make kernelversion' fails, the ' || echo "unknown"' phrase will catch the failure. Before: NIPA ingest_mdir.py: ynl Full series FAIL (1) Generated files up to date; build has 1 warnings/errors; no diff in generated; After: NIPA ingest_mdir.py: Series level tests: ynl OKAY Validated output: $ ./ynltool/ynltool --version ynltool 6.19.0-rc4 Signed-off-by: Bobby Eshleman <bobbyeshleman@meta.com> Link: https://patch.msgid.link/20260112-ynl-make-fix-v1-1-c399e76925ad@meta.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>