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R. Silva" , linux-kernel@vger.kernel.org (open list), linux-hardening@vger.kernel.org (open list:KERNEL HARDENING (not covered by other areas):Keyword:\b__counted_by(_le|_be)?\b) Subject: [PATCH] gpio: mockup: allocate lines with main struct Date: Wed, 18 Mar 2026 17:05:58 -0700 Message-ID: <20260319000558.22108-1-rosenp@gmail.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Remove no longer needed kcalloc to simplify allocation. Added __counted_by along with a counting variable to get extra runtime analysis. Signed-off-by: Rosen Penev Reviewed-by: Linus Walleij --- drivers/gpio/gpio-mockup.c | 17 ++++++++--------- 1 file changed, 8 insertions(+), 9 deletions(-) diff --git a/drivers/gpio/gpio-mockup.c b/drivers/gpio/gpio-mockup.c index a7d69f3835c1..a907ce28cbbb 100644 --- a/drivers/gpio/gpio-mockup.c +++ b/drivers/gpio/gpio-mockup.c @@ -52,10 +52,11 @@ struct gpio_mockup_line_status { =20 struct gpio_mockup_chip { struct gpio_chip gc; - struct gpio_mockup_line_status *lines; struct irq_domain *irq_sim_domain; struct dentry *dbg_dir; struct mutex lock; + int nr_lines; + struct gpio_mockup_line_status lines[] __counted_by(nr_lines); }; =20 struct gpio_mockup_dbgfs_private { @@ -436,15 +437,18 @@ static int gpio_mockup_probe(struct platform_device *= pdev) if (rv) name =3D dev_name(dev); =20 - chip =3D devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL); + chip =3D devm_kzalloc(dev, struct_size(chip, lines, ngpio), GFP_KERNEL); if (!chip) return -ENOMEM; =20 - mutex_init(&chip->lock); + chip->nr_lines =3D ngpio; =20 gc =3D &chip->gc; - gc->base =3D base; gc->ngpio =3D ngpio; + gc->base =3D base; + + mutex_init(&chip->lock); + gc->label =3D name; gc->owner =3D THIS_MODULE; gc->parent =3D dev; @@ -460,11 +464,6 @@ static int gpio_mockup_probe(struct platform_device *p= dev) gc->request =3D gpio_mockup_request; gc->free =3D gpio_mockup_free; =20 - chip->lines =3D devm_kcalloc(dev, gc->ngpio, - sizeof(*chip->lines), GFP_KERNEL); - if (!chip->lines) - return -ENOMEM; - for (i =3D 0; i < gc->ngpio; i++) chip->lines[i].dir =3D GPIO_LINE_DIRECTION_IN; =20 --=20 2.53.0