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SubjectRe: [PATCH] checkpatch: warn about using CONFIG_EXPERIMENTAL
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On Mon, 2012-11-12 at 14:50 -0800, Kees Cook wrote:
> This config item has not carried much meaning for a while now and is
> almost always enabled by default. As agreed during the Linux kernel
> summit, it is being removed. This will discourage future addition of
> CONFIG_EXPERIMENTAL while it is being phased out.

You should also cc Andrew Morton (cc'd)

> Cc: Andy Whitcroft <apw@canonical.com>
> Cc: Joe Perches <joe@perches.com>
> Signed-off-by: Kees Cook <keescook@chromium.org>
> ---
> scripts/checkpatch.pl | 17 +++++++++++++++++
> 1 file changed, 17 insertions(+)
>
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index f18750e..41e364b 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -1757,6 +1757,15 @@ sub process {
> #print "is_start<$is_start> is_end<$is_end> length<$length>\n";
> }
>
> +# discourage the addition of CONFIG_EXPERIMENTAL in Kconfig.
> + if ($realfile =~ /Kconfig/ &&
> + $line =~ /.\s*depends on\s+.*\bEXPERIMENTAL\b/) {

This is after the deleted lines check so this won't trigger
on deleted lines.

> + WARN("CONFIG_EXPERIMENTAL",
> + "Use of CONFIG_EXPERIMENTAL is deprecated. " +
> + "For alternatives, see " +
> + "https://lkml.org/lkml/2012/10/23/580\n");

I'd much prefer this be on a single line and not using the +
string operator as that style is not currently used in checkpatch.

> + }
> +
> if (($realfile =~ /Makefile.*/ || $realfile =~ /Kbuild.*/) &&
> ($line =~ /\+(EXTRA_[A-Z]+FLAGS).*/)) {
> my $flag = $1;
> @@ -1912,6 +1921,14 @@ sub process {
> # check we are in a valid C source file if not then ignore this hunk
> next if ($realfile !~ /\.(h|c)$/);
>
> +# discourage the addition of CONFIG_EXPERIMENTAL in #if(def).
> + if ($line =~ /^\+\s*\#\s*if.*\bCONFIG_EXPERIMENTAL\b/) {

Same as previous reply just a few minutes ago

There are many config uses like:
#if defined(CONFIG_FOO)
and
#if defined CONFIG_FOO || defined CONFIG_BAR

so I think any line that has this specific config option is suspect.
> + WARN("CONFIG_EXPERIMENTAL",
> + "Use of CONFIG_EXPERIMENTAL is deprecated. " +
> + "For alternatives, see " +
> + "https://lkml.org/lkml/2012/10/23/580\n");
> + }





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