diff mbox series

[07/14] xen-swiotlb: remove xen_set_nslabs

Message ID 20210301074436.919889-8-hch@lst.de (mailing list archive)
State New
Headers show
Series [01/14] powerpc/svm: stop using io_tlb_start | expand

Commit Message

Christoph Hellwig March 1, 2021, 7:44 a.m. UTC
The xen_set_nslabs function is a little weird, as it has just one
caller, that caller passes a global variable as the argument,
which is then overriden in the function and a derivative of it
returned.  Just add a cpp symbol for the default size using a readable
constant and open code the remaining three lines in the caller.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/xen/swiotlb-xen.c | 19 +++++++------------
 1 file changed, 7 insertions(+), 12 deletions(-)
diff mbox series

Patch

diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index e99f0614dcb979..5352655432e724 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -138,16 +138,6 @@  xen_swiotlb_fixup(void *buf, size_t size, unsigned long nslabs)
 	} while (i < nslabs);
 	return 0;
 }
-static unsigned long xen_set_nslabs(unsigned long nr_tbl)
-{
-	if (!nr_tbl) {
-		xen_io_tlb_nslabs = (64 * 1024 * 1024 >> IO_TLB_SHIFT);
-		xen_io_tlb_nslabs = ALIGN(xen_io_tlb_nslabs, IO_TLB_SEGSIZE);
-	} else
-		xen_io_tlb_nslabs = nr_tbl;
-
-	return xen_io_tlb_nslabs << IO_TLB_SHIFT;
-}
 
 enum xen_swiotlb_err {
 	XEN_SWIOTLB_UNKNOWN = 0,
@@ -170,6 +160,9 @@  static const char *xen_swiotlb_error(enum xen_swiotlb_err err)
 	}
 	return "";
 }
+
+#define DEFAULT_NSLABS		ALIGN(SZ_64M >> IO_TLB_SHIFT, IO_TLB_SEGSIZE)
+
 int __ref xen_swiotlb_init(int verbose, bool early)
 {
 	unsigned long bytes, order;
@@ -179,8 +172,10 @@  int __ref xen_swiotlb_init(int verbose, bool early)
 
 	xen_io_tlb_nslabs = swiotlb_nr_tbl();
 retry:
-	bytes = xen_set_nslabs(xen_io_tlb_nslabs);
-	order = get_order(xen_io_tlb_nslabs << IO_TLB_SHIFT);
+	if (!xen_io_tlb_nslabs)
+		xen_io_tlb_nslabs = DEFAULT_NSLABS;
+	bytes = xen_io_tlb_nslabs << IO_TLB_SHIFT;
+	order = get_order(bytes);
 
 	/*
 	 * IO TLB memory already allocated. Just use it.