From: Johan Hovold <johan@kernel.org>
To: Gal Pressman <gal@nvidia.com>
Cc: Julia Lawall <Julia.Lawall@inria.fr>,
Nicolas Palix <nicolas.palix@imag.fr>,
Jakub Kicinski <kuba@kernel.org>,
Alexei Lazar <alazar@nvidia.com>, Simon Horman <horms@kernel.org>,
cocci@inria.fr, linux-kernel@vger.kernel.org
Subject: Re: [cocci] [PATCH] Revert "scripts/coccinelle: Find PTR_ERR() to %pe candidates"
Date: Wed, 29 Oct 2025 17:38:59 +0100 [thread overview]
Message-ID: <aQJDIz-8Ow0OmczH@hovoldconsulting.com> (raw)
In-Reply-To: <826f2fdb-bad8-44f4-8c8e-9353c3de73cd@nvidia.com>
On Wed, Oct 29, 2025 at 03:59:50PM +0200, Gal Pressman wrote:
> On 29/10/2025 15:29, Johan Hovold wrote:
> > This reverts commit 57c49d2355729c12475554b4c51dbf830b02d08d.
> >
> > Using "%pe" to print errnos is in no way mandated and a driver authors
> > may chose not to use it, for example, for consistency reasons.
> >
> > Drop the recently added cocci script that has gotten the build bots to
> > send warning emails about perfectly valid code and which will likely
> > only result in churn and inconsistency.
> >
> > Link: https://lore.kernel.org/all/aQHi4nUfIlcN1ac6@hovoldconsulting.com/
> > Signed-off-by: Johan Hovold <johan@kernel.org>
>
> The test by no means mandates authors to use %pe, as the output says:
> WARNING: Consider using %pe to print PTR_ERR()
>
> "Consider" :).
Right, but it's preceded by a big "WARNING".
> I would consider it best practice to use it, and a few drivers were
> converted thanks to this test.
Unlike the rest of the misc cocci scripts I skimmed, this one does not
guard against any bugs. Instead it's pushing for a subjective style
preference, which is just going to result in churn when the clean up
crew starts sending mindless conversions of individual printks.
By all means, use %pe for your drivers, but it should not be forced
upon the rest of us this way.
> If the issue is with automatic build bots, then maybe this test should
> be excluded from them, rather than deleted?
It's both; it's the noise the new warnings generate but also the coming
flood up patches to "fix" them. There are already some 40 commits or so
in linux-next referencing this script.
Johan
next prev parent reply other threads:[~2025-10-29 16:48 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-29 13:29 [cocci] [PATCH] Revert "scripts/coccinelle: Find PTR_ERR() to %pe candidates" Johan Hovold
2025-10-29 13:59 ` Gal Pressman
2025-10-29 14:04 ` Julia Lawall
2025-10-29 17:26 ` Jakub Kicinski
2025-10-29 16:38 ` Johan Hovold [this message]
2025-10-29 17:00 ` [cocci] " Markus Elfring
2025-10-29 17:35 ` [cocci] [PATCH] " Gal Pressman
2025-10-30 14:06 ` Johan Hovold
2025-10-30 14:36 ` Gal Pressman
2025-10-31 14:10 ` Johan Hovold
2025-10-30 7:36 ` Julia Lawall
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