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drivers/iommu/intel-iommu.c: fix variable 'iommu' set but not used 

Commit cf04eee8bf ("iommu/vt-d: Include ACPI devices in iommu=pt")
added for_each_active_iommu() in iommu_prepare_static_identity_mapping()
but never used the each element, i.e, "drhd->iommu".

drivers/iommu/intel-iommu.c: In function
'iommu_prepare_static_identity_mapping':
drivers/iommu/intel-iommu.c:3037:22: warning: variable 'iommu' set but
not used [-Wunused-but-set-variable]
 struct intel_iommu *iommu;

Fixed the warning by appending a compiler attribute __maybe_unused for it.

Link: http://lkml.kernel.org/r/20190523013314.2732-1-cai@lca.pw
Signed-off-by: Qian Cai <cai@lca.pw>
Suggested-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Joerg Roedel <jroedel@suse.de>
Cc: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Qian Cai 2019-05-31 22:30:49 -07:00 committed by Linus Torvalds
parent 8d7a7abfc6
commit d3ed71e5cc
1 changed files with 2 additions and 1 deletions
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3
drivers/iommu/intel-iommu.c
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@ -3034,7 +3034,8 @@ static int __init iommu_prepare_static_identity_mapping(int hw)
{
struct pci_dev *pdev = NULL;
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;
int ret = 0;