linux-kernel - [PATCH] swiotlb-zen: Convert to use macro

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Date:   Mon,  2 Sep 2019 00:58:56 +0530
From:   Souptick Joarder <jrdr.linux@...il.com>
To:     konrad.wilk@...cle.com, boris.ostrovsky@...cle.com,
        jgross@...e.com, sstabellini@...nel.org
Cc:     xen-devel@...ts.xenproject.org, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org,
        Souptick Joarder <jrdr.linux@...il.com>
Subject: [PATCH] swiotlb-zen: Convert to use macro

Rather than using static int max_dma_bits, this
can be coverted to use as macro.

Signed-off-by: Souptick Joarder <jrdr.linux@...il.com>
---
 drivers/xen/swiotlb-xen.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index ae1df49..d1eced5 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -38,6 +38,7 @@
 #include <asm/xen/page-coherent.h>
 
 #include <trace/events/swiotlb.h>
+#define MAX_DMA_BITS 32
 /*
  * Used to do a quick range check in swiotlb_tbl_unmap_single and
  * swiotlb_tbl_sync_single_*, to see if the memory was in fact allocated by this
@@ -114,8 +115,6 @@ static int is_xen_swiotlb_buffer(dma_addr_t dma_addr)
 	return 0;
 }
 
-static int max_dma_bits = 32;
-
 static int
 xen_swiotlb_fixup(void *buf, size_t size, unsigned long nslabs)
 {
@@ -135,7 +134,7 @@ static int is_xen_swiotlb_buffer(dma_addr_t dma_addr)
 				p + (i << IO_TLB_SHIFT),
 				get_order(slabs << IO_TLB_SHIFT),
 				dma_bits, &dma_handle);
-		} while (rc && dma_bits++ < max_dma_bits);
+		} while (rc && dma_bits++ < MAX_DMA_BITS);
 		if (rc)
 			return rc;
 
-- 
1.9.1