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xen-swiotlb: remove xen_set_nslabs

Browse source 
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>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Christoph Hellwig 2021-03-01 08:44:29 +01:00 committed by Konrad Rzeszutek Wilk
parent 6223d1cef7
commit 4035b43da6
1 changed files with 7 additions and 12 deletions
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19
drivers/xen/swiotlb-xen.c
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@ -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.