From: Murilo Opsfelder Araujo Date: Fri, 15 Apr 2022 02:30:02 +0000 (-0300) Subject: virtio-pci: Remove wrong address verification in vp_del_vqs() X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=7e415282b41bf0d15c6e0fe268f822d9b083f2f7;p=linux.git virtio-pci: Remove wrong address verification in vp_del_vqs() GCC 12 enhanced -Waddress when comparing array address to null [0], which warns: drivers/virtio/virtio_pci_common.c: In function ‘vp_del_vqs’: drivers/virtio/virtio_pci_common.c:257:29: warning: the comparison will always evaluate as ‘true’ for the pointer operand in ‘vp_dev->msix_affinity_masks + (sizetype)((long unsigned int)i * 256)’ must not be NULL [-Waddress] 257 | if (vp_dev->msix_affinity_masks[i]) | ^~~~~~ In fact, the verification is comparing the result of a pointer arithmetic, the address "msix_affinity_masks + i", which will always evaluate to true. Under the hood, free_cpumask_var() calls kfree(), which is safe to pass NULL, not requiring non-null verification. So remove the verification to make compiler happy (happy compiler, happy life). [0] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102103 Signed-off-by: Murilo Opsfelder Araujo Message-Id: <20220415023002.49805-1-muriloo@linux.ibm.com> Signed-off-by: Michael S. Tsirkin Acked-by: Christophe de Dinechin --- diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c index d724f676608ba..5046efcffb4c0 100644 --- a/drivers/virtio/virtio_pci_common.c +++ b/drivers/virtio/virtio_pci_common.c @@ -254,8 +254,7 @@ void vp_del_vqs(struct virtio_device *vdev) if (vp_dev->msix_affinity_masks) { for (i = 0; i < vp_dev->msix_vectors; i++) - if (vp_dev->msix_affinity_masks[i]) - free_cpumask_var(vp_dev->msix_affinity_masks[i]); + free_cpumask_var(vp_dev->msix_affinity_masks[i]); } if (vp_dev->msix_enabled) {