linux-kernel - Re: [PATCH v3] coccinelle: fix parallel build with CHECK=scripts/coccicheck

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Message-ID: <alpine.DEB.2.20.1711141047350.2874@hadrien>
Date:   Tue, 14 Nov 2017 10:49:12 +0100 (CET)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
cc:     linux-kbuild@...r.kernel.org, cocci@...teme.lip6.fr,
        Nicolas Palix <nicolas.palix@...g.fr>,
        Gilles Muller <Gilles.Muller@...6.fr>,
        linux-kernel@...r.kernel.org,
        Michal Marek <michal.lkml@...kovi.net>
Subject: Re: [PATCH v3] coccinelle: fix parallel build with
 CHECK=scripts/coccicheck

> +
> +    # If -j option is given to Make, scripts/coccicheck runs in parallel.
> +    # If coccinelle also runs in parallel, it fails because multiple processes
> +    # try to get access to the same subdirectory that stores stdout/stderr.
> +    # No need to parallelize coccinelle in this case - this mode takes only
> +    # one file input.
> +    NPROC=1

Since I am also changing Coccinelle to avoid the problem, maybe it would
be better to just remove the explanation sentence (If coccinelle also runs
in parallel,...).

julia