docs: Makefile: Use CONFIG_SHELL not SHELL
commit 222a28ed upstream. Fix think-o about which variable to find the Kbuild-configured shell. This has accidentally worked due to most shells setting $SHELL by default. Fixes: 51e46c7a ("docs, parallelism: Rearrange how jobserver reservations are made") Cc: stable@vger.kernel.org Signed-off-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20210617225808.3907377-1-keescook@chromium.org Signed-off-by: Jonathan Corbet <corbet@lwn.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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