linux-kernel - [PATCH] iommu/vt-d: Remove unused dma_to_mm

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Date:   Sun, 7 Nov 2021 19:53:32 -0300
From:   Maíra Canal <maira.canal@....br>
To:     dwmw2@...radead.org, baolu.lu@...ux.intel.com, joro@...tes.org,
        will@...nel.org, nathan@...nel.org, ndesaulniers@...gle.com
Cc:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: [PATCH] iommu/vt-d: Remove unused dma_to_mm_pfn function

Remove dma_to_buf_pfn function, which is not used in the codebase.

This was pointed by clang with the following warning:

drivers/iommu/intel/iommu.c:136:29: warning: unused function
'dma_to_mm_pfn' [-Wunused-function]
static inline unsigned long dma_to_mm_pfn(unsigned long dma_pfn)
                            ^

Signed-off-by: Maíra Canal <maira.canal@....br>
---
 drivers/iommu/intel/iommu.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 0bde0c8b4126..35300b5b69f7 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -133,11 +133,6 @@ static inline unsigned long lvl_to_nr_pages(unsigned int lvl)
 
 /* VT-d pages must always be _smaller_ than MM pages. Otherwise things
    are never going to work. */
-static inline unsigned long dma_to_mm_pfn(unsigned long dma_pfn)
-{
-	return dma_pfn >> (PAGE_SHIFT - VTD_PAGE_SHIFT);
-}
-
 static inline unsigned long mm_to_dma_pfn(unsigned long mm_pfn)
 {
 	return mm_pfn << (PAGE_SHIFT - VTD_PAGE_SHIFT);
-- 
2.31.1