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swiotlb-xen: Convert to use macro

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

Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
This commit is contained in:
Souptick Joarder 2019-09-02 14:09:58 +05:30 committed by Boris Ostrovsky
parent 089cf7f6ec
commit e6fa0dc867
1 changed files with 2 additions and 3 deletions
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5
drivers/xen/swiotlb-xen.c
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@ -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 @@ xen_swiotlb_fixup(void *buf, size_t size, unsigned long nslabs)
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;