netdev - [PATCH v2 15/15] gpio: virtio: reorder fields to reduce struct padding

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Message-ID: <f1221bbc120df6adaba9006710a517f1e84a10b2.1767601130.git.mst@redhat.com>
Date: Mon, 5 Jan 2026 03:23:49 -0500
From: "Michael S. Tsirkin" <mst@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: Cong Wang <xiyou.wangcong@...il.com>, Jonathan Corbet <corbet@....net>,
	Olivia Mackall <olivia@...enic.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Jason Wang <jasowang@...hat.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Stefan Hajnoczi <stefanha@...hat.com>,
	Eugenio Pérez <eperezma@...hat.com>,
	"James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Gerd Hoffmann <kraxel@...hat.com>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Robin Murphy <robin.murphy@....com>,
	Stefano Garzarella <sgarzare@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>, Petr Tesarik <ptesarik@...e.com>,
	Leon Romanovsky <leon@...nel.org>, Jason Gunthorpe <jgg@...pe.ca>,
	Bartosz Golaszewski <brgl@...nel.org>, linux-doc@...r.kernel.org,
	linux-crypto@...r.kernel.org, virtualization@...ts.linux.dev,
	linux-scsi@...r.kernel.org, iommu@...ts.linux.dev,
	kvm@...r.kernel.org, netdev@...r.kernel.org,
	Viresh Kumar <viresh.kumar@...aro.org>,
	"Enrico Weigelt, metux IT consult" <info@...ux.net>,
	Viresh Kumar <vireshk@...nel.org>,
	Linus Walleij <linusw@...nel.org>, linux-gpio@...r.kernel.org
Subject: [PATCH v2 15/15] gpio: virtio: reorder fields to reduce struct
 padding

Reorder struct virtio_gpio_line fields to place the DMA buffers
(req/res) last.

This eliminates the padding from aligning struct size on
ARCH_DMA_MINALIGN.

Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
---
 drivers/gpio/gpio-virtio.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-virtio.c b/drivers/gpio/gpio-virtio.c
index b70294626770..ed6e0e90fa8a 100644
--- a/drivers/gpio/gpio-virtio.c
+++ b/drivers/gpio/gpio-virtio.c
@@ -26,11 +26,12 @@ struct virtio_gpio_line {
 	struct mutex lock; /* Protects line operation */
 	struct completion completion;
 
+	unsigned int rxlen;
+
 	__dma_from_device_group_begin();
 	struct virtio_gpio_request req;
 	struct virtio_gpio_response res;
 	__dma_from_device_group_end();
-	unsigned int rxlen;
 };
 
 struct vgpio_irq_line {
-- 
MST