linux-kernel - [PATCH 03/11] xen/arm: pass one less argument to dma_cache

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Date:   Fri, 16 Aug 2019 15:00:05 +0200
From:   Christoph Hellwig <hch@....de>
To:     Stefano Stabellini <sstabellini@...nel.org>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:     x86@...nel.org, linux-arm-kernel@...ts.infradead.org,
        xen-devel@...ts.xenproject.org, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 03/11] xen/arm: pass one less argument to dma_cache_maint

Instead of taking apart the dma address in both callers do it inside
dma_cache_maint itself.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 arch/arm/xen/mm.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/arch/arm/xen/mm.c b/arch/arm/xen/mm.c
index 90574d89d0d4..d9da24fda2f7 100644
--- a/arch/arm/xen/mm.c
+++ b/arch/arm/xen/mm.c
@@ -43,13 +43,15 @@ static bool hypercall_cflush = false;
 
 /* functions called by SWIOTLB */
 
-static void dma_cache_maint(dma_addr_t handle, unsigned long offset,
-	size_t size, enum dma_data_direction dir, enum dma_cache_op op)
+static void dma_cache_maint(dma_addr_t handle, size_t size,
+		enum dma_data_direction dir, enum dma_cache_op op)
 {
 	struct gnttab_cache_flush cflush;
 	unsigned long xen_pfn;
+	unsigned long offset = handle & ~PAGE_MASK;
 	size_t left = size;
 
+	offset &= PAGE_MASK;
 	xen_pfn = (handle >> XEN_PAGE_SHIFT) + offset / XEN_PAGE_SIZE;
 	offset %= XEN_PAGE_SIZE;
 
@@ -86,13 +88,13 @@ static void dma_cache_maint(dma_addr_t handle, unsigned long offset,
 static void __xen_dma_page_dev_to_cpu(struct device *hwdev, dma_addr_t handle,
 		size_t size, enum dma_data_direction dir)
 {
-	dma_cache_maint(handle & PAGE_MASK, handle & ~PAGE_MASK, size, dir, DMA_UNMAP);
+	dma_cache_maint(handle, size, dir, DMA_UNMAP);
 }
 
 static void __xen_dma_page_cpu_to_dev(struct device *hwdev, dma_addr_t handle,
 		size_t size, enum dma_data_direction dir)
 {
-	dma_cache_maint(handle & PAGE_MASK, handle & ~PAGE_MASK, size, dir, DMA_MAP);
+	dma_cache_maint(handle, size, dir, DMA_MAP);
 }
 
 void __xen_dma_map_page(struct device *hwdev, struct page *page,
-- 
2.20.1