iommu/vt-d: Silence a variable set but not used

The commit "iommu/vt-d: Probe DMA-capable ACPI name space devices"
introduced a compilation warning due to the "iommu" variable in
for_each_active_iommu() but never used the for each element, i.e,
"drhd->iommu".

drivers/iommu/intel-iommu.c: In function 'probe_acpi_namespace_devices':
drivers/iommu/intel-iommu.c:4639:22: warning: variable 'iommu' set but
not used [-Wunused-but-set-variable]
  struct intel_iommu *iommu;

Silence the warning the same way as in the commit d3ed71e5cc50
("drivers/iommu/intel-iommu.c: fix variable 'iommu' set but not used")

Signed-off-by: Qian Cai <cai@lca.pw>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 1b89c3407251ffe03655cd220e90b3f38c932ab7..ca0a1d5d2983aa12e514318de03e8e3a26304bb5 100644 (file)
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -4587,7 +4587,8 @@ static int __init platform_optin_force_iommu(void)
 static int __init probe_acpi_namespace_devices(void)
 {
        struct dmar_drhd_unit *drhd;
-       struct intel_iommu *iommu;
+       /* To avoid a -Wunused-but-set-variable warning. */
+       struct intel_iommu *iommu __maybe_unused;
        struct device *dev;
        int i, ret = 0;