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From: Christophe de Dinechin <dinechin@redhat.com>
To: trivial@kernel.org
Cc: Ben Segall <bsegall@google.com>,
	"Michael S. Tsirkin" <mst@redhat.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Steven Rostedt <rostedt@goodmis.org>,
	Ingo Molnar <mingo@redhat.com>, Mel Gorman <mgorman@suse.de>,
	Dietmar Eggemann <dietmar.eggemann@arm.com>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Daniel Bristot de Oliveira <bristot@redhat.com>,
	Jason Wang <jasowang@redhat.com>,
	virtualization@lists.linux-foundation.org,
	linux-kernel@vger.kernel.org,
	Zhen Lei <thunder.leizhen@huawei.com>,
	Christophe de Dinechin <dinechin@redhat.com>,
	Juri Lelli <juri.lelli@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>
Subject: [PATCH 3/3] virtio-pci: Use cpumask_available to fix compilation error
Date: Thu, 14 Apr 2022 17:08:55 +0200	[thread overview]
Message-ID: <20220414150855.2407137-4-dinechin@redhat.com> (raw)
In-Reply-To: <20220414150855.2407137-1-dinechin@redhat.com>

With GCC 12 and defconfig, we get the following error:

|   CC      drivers/virtio/virtio_pci_common.o
| drivers/virtio/virtio_pci_common.c: In function ‘vp_del_vqs’:
| drivers/virtio/virtio_pci_common.c:257:29: error: the comparison will
|  always evaluate as ‘true’ for the pointer operand in
|  ‘vp_dev->msix_affinity_masks + (sizetype)((long unsigned int)i * 8)’
|  must not be NULL [-Werror=address]
|   257 |                         if (vp_dev->msix_affinity_masks[i])
|       |                             ^~~~~~

This happens in the case where CONFIG_CPUMASK_OFFSTACK is not defined,
since we typedef cpumask_var_t as an array. The compiler is essentially
complaining that an array pointer cannot be NULL. This is not a very
important warning, but there is a function called cpumask_available that
seems to be defined just for that case, so the fix is easy.

Signed-off-by: Christophe de Dinechin <christophe@dinechin.org>
Signed-off-by: Christophe de Dinechin <dinechin@redhat.com>
---
 drivers/virtio/virtio_pci_common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c
index d724f676608b..5c44a2f13c93 100644
--- a/drivers/virtio/virtio_pci_common.c
+++ b/drivers/virtio/virtio_pci_common.c
@@ -254,7 +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])
+			if (cpumask_available(vp_dev->msix_affinity_masks[i]))
 				free_cpumask_var(vp_dev->msix_affinity_masks[i]);
 	}
 
-- 
2.35.1


  parent reply	other threads:[~2022-04-14 15:45 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-04-14 15:08 [PATCH 0/3] trivial: Fix several compilation errors/warnings with GCC12 Christophe de Dinechin
2022-04-14 15:08 ` [PATCH 1/3] sched/headers: Fix compilation error with GCC 12 Christophe de Dinechin
2022-04-14 15:21   ` Peter Zijlstra
2022-04-14 20:30     ` Andrew Morton
2022-04-17 15:52       ` Peter Zijlstra
2022-04-20 18:45         ` Kees Cook
2022-04-21  7:32           ` Peter Zijlstra
2022-04-25 14:23       ` Christophe de Dinechin
2022-04-17 13:27     ` David Laight
2022-04-25 14:07     ` Christophe de Dinechin
2022-05-19 11:16       ` Peter Zijlstra
2022-04-14 15:08 ` [PATCH 2/3] nodemask.h: Fix compilation error with GCC12 Christophe de Dinechin
2022-04-14 15:23   ` Peter Zijlstra
2022-04-14 15:08 ` Christophe de Dinechin [this message]
2022-04-15  8:48   ` [PATCH 3/3] virtio-pci: Use cpumask_available to fix compilation error Michael S. Tsirkin
2022-04-28  9:48     ` Christophe Marie Francois Dupont de Dinechin
2022-04-28 11:06       ` Michael S. Tsirkin
2022-05-15 21:24 ` [PATCH 0/3] trivial: Fix several compilation errors/warnings with GCC12 Davidlohr Bueso

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