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[82.69.66.36]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4548e6a6470sm22087839f8f.7.2026.05.11.06.27.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 11 May 2026 06:27:46 -0700 (PDT) Date: Mon, 11 May 2026 14:27:45 +0100 From: David Laight To: Jonathan Corbet Cc: Manuel Ebner , andy.shevchenko@gmail.com, apw@canonical.com, dwaipayanray1@gmail.com, joe@perches.com, kees@kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, lukas.bulwahn@gmail.com, skhan@linuxfoundation.org, workflows@vger.kernel.org Subject: Re: [PATCH 2/2] scripts: checkpatch.pl: add warning for strlcat() Message-ID: <20260511142745.7757b1b2@pumpkin> In-Reply-To: <87a4u6w3ez.fsf@trenco.lwn.net> References: <20260510164907.57176-2-manuelebner@mailbox.org> <20260510165649.57880-2-manuelebner@mailbox.org> <87a4u6w3ez.fsf@trenco.lwn.net> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; arm-unknown-linux-gnueabihf) Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Mon, 11 May 2026 06:12:36 -0600 Jonathan Corbet wrote: > Manuel Ebner writes: > > > add a warning for strlcat() > > > > Signed-off-by: Manuel Ebner > > --- > > scripts/checkpatch.pl | 6 ++++++ > > 1 file changed, 6 insertions(+) > > > > diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl > > index 0492d6afc9a1..ca1a8e67d529 100755 > > --- a/scripts/checkpatch.pl > > +++ b/scripts/checkpatch.pl > > @@ -7085,6 +7085,12 @@ sub process { > > "Prefer strscpy over strlcpy - see: https://github.com/KSPP/linux/issues/89\n" . $herecurr); > > } > > > > +# strlcat uses that should likely be > > + if ($line =~ /\bstrlcat\s*\(/ && !is_userspace($realfile)) { > > + WARN("STRLCAT", > > + "Prefer seq_buf_printf() over strlcat - see: https://github.com/KSPP/linux/issues/370\n" . $herecurr); > > + } > > Using seq_buf_printf() requires switching over to the seq_buf API in > general, it is not just a simple substitution, so this advice may prove > unhelpful to many. And I'm not sure the external url is a good idea. > > jon >