Messages in this thread Patch in this message | | | From | Murilo Opsfelder Araujo <> | Subject | [PATCH] virtio-pci: Remove wrong address verification in vp_del_vqs() | Date | Thu, 14 Apr 2022 23:30:02 -0300 |
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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 <muriloo@linux.ibm.com> --- drivers/virtio/virtio_pci_common.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c index d724f676608b..5046efcffb4c 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) { -- 2.35.1
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