* [PATCH v3] xen/arm: smmuv3: mark arm_smmu_disable_pasid __maybe_unused
@ 2022-12-15 21:26 Stewart Hildebrand
2022-12-20 9:35 ` Julien Grall
0 siblings, 1 reply; 2+ messages in thread
From: Stewart Hildebrand @ 2022-12-15 21:26 UTC (permalink / raw)
To: xen-devel
Cc: Stewart Hildebrand, Bertrand Marquis, Rahul Singh,
Stefano Stabellini, Julien Grall, Volodymyr Babchuk
When building with clang 12 and CONFIG_ARM_SMMU_V3=y, we observe the
following build error:
drivers/passthrough/arm/smmu-v3.c:1408:20: error: unused function 'arm_smmu_disable_pasid' [-Werror,-Wunused-function]
static inline void arm_smmu_disable_pasid(struct arm_smmu_master *master) { }
^
arm_smmu_disable_pasid is not currently called from anywhere in Xen, but
it is inside a section of code guarded by CONFIG_PCI_ATS, which may be
helpful in the future if the PASID feature is to be implemented. Add the
attribute __maybe_unused to the function.
Signed-off-by: Stewart Hildebrand <stewart.hildebrand@amd.com>
Reviewed-by: Rahul Singh <rahul.singh@arm.com>
---
v2->v3:
Place __maybe_unused after "void" and add newline after __maybe_unused
Add Rahul's R-b
v1->v2:
Add __maybe_unused attribute instead of removing
---
xen/drivers/passthrough/arm/smmu-v3.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/xen/drivers/passthrough/arm/smmu-v3.c b/xen/drivers/passthrough/arm/smmu-v3.c
index 9c9f4630090e..d58c5cd0bf77 100644
--- a/xen/drivers/passthrough/arm/smmu-v3.c
+++ b/xen/drivers/passthrough/arm/smmu-v3.c
@@ -1376,7 +1376,8 @@ static int arm_smmu_enable_pasid(struct arm_smmu_master *master)
return 0;
}
-static void arm_smmu_disable_pasid(struct arm_smmu_master *master)
+static void __maybe_unused
+arm_smmu_disable_pasid(struct arm_smmu_master *master)
{
struct pci_dev *pdev;
@@ -1405,7 +1406,8 @@ static inline int arm_smmu_enable_pasid(struct arm_smmu_master *master)
return 0;
}
-static inline void arm_smmu_disable_pasid(struct arm_smmu_master *master) { }
+static inline void __maybe_unused
+arm_smmu_disable_pasid(struct arm_smmu_master *master) { }
#endif /* CONFIG_PCI_ATS */
static void arm_smmu_detach_dev(struct arm_smmu_master *master)
--
2.39.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH v3] xen/arm: smmuv3: mark arm_smmu_disable_pasid __maybe_unused
2022-12-15 21:26 [PATCH v3] xen/arm: smmuv3: mark arm_smmu_disable_pasid __maybe_unused Stewart Hildebrand
@ 2022-12-20 9:35 ` Julien Grall
0 siblings, 0 replies; 2+ messages in thread
From: Julien Grall @ 2022-12-20 9:35 UTC (permalink / raw)
To: Stewart Hildebrand, xen-devel
Cc: Bertrand Marquis, Rahul Singh, Stefano Stabellini, Volodymyr Babchuk
Hi,
On 15/12/2022 21:26, Stewart Hildebrand wrote:
> When building with clang 12 and CONFIG_ARM_SMMU_V3=y, we observe the
> following build error:
>
> drivers/passthrough/arm/smmu-v3.c:1408:20: error: unused function 'arm_smmu_disable_pasid' [-Werror,-Wunused-function]
> static inline void arm_smmu_disable_pasid(struct arm_smmu_master *master) { }
> ^
>
> arm_smmu_disable_pasid is not currently called from anywhere in Xen, but
> it is inside a section of code guarded by CONFIG_PCI_ATS, which may be
> helpful in the future if the PASID feature is to be implemented. Add the
> attribute __maybe_unused to the function.
>
> Signed-off-by: Stewart Hildebrand <stewart.hildebrand@amd.com>
> Reviewed-by: Rahul Singh <rahul.singh@arm.com>
I have committed the patch.
Cheers,
--
Julien Grall
^ permalink raw reply [flat|nested] 2+ messages in thread
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