linux-kernel - [PATCH 1/1] iommu/vt-d: Remove set but not used variable

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Date:   Fri, 27 Nov 2020 09:33:08 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Will Deacon <will@...nel.org>, Joerg Roedel <joro@...tes.org>
Cc:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        kernel test robot <lkp@...el.com>
Subject: [PATCH 1/1] iommu/vt-d: Remove set but not used variable

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/iommu/intel/iommu.c:5643:27: warning: variable 'last_pfn' set but not used [-Wunused-but-set-variable]
5643 |  unsigned long start_pfn, last_pfn;
     |                           ^~~~~~~~

This variable is never used, so remove it.

Fixes: 2a2b8eaa5b256 ("iommu: Handle freelists when using deferred flushing in iommu drivers")
Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
---
 drivers/iommu/intel/iommu.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index f9379b4a32fb..8c6c3c0812d2 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -4942,13 +4942,12 @@ static void intel_iommu_tlb_sync(struct iommu_domain *domain,
 	struct dmar_domain *dmar_domain = to_dmar_domain(domain);
 	unsigned long iova_pfn = IOVA_PFN(gather->start);
 	size_t size = gather->end - gather->start;
-	unsigned long start_pfn, last_pfn;
+	unsigned long start_pfn;
 	unsigned long nrpages;
 	int iommu_id;
 
 	nrpages = aligned_nrpages(gather->start, size);
 	start_pfn = mm_to_dma_pfn(iova_pfn);
-	last_pfn = start_pfn + nrpages - 1;
 
 	for_each_domain_iommu(iommu_id, dmar_domain)
 		iommu_flush_iotlb_psi(g_iommus[iommu_id], dmar_domain,
-- 
2.25.1