From dfbca89987b74c34d9b1a2414b0e5ccee65347e0 Mon Sep 17 00:00:00 2001 From: Paul Mundt Date: Tue, 11 May 2010 13:50:29 +0900 Subject: sh: Reject small mappings for PMB bolting. The minimum section size for the PMB is 16M, so just always error out early if the specified size is too small. This permits us to unconditionally call in to pmb_bolt_mapping() with variable sizes without wasting a TLB and cache flush for the range. Signed-off-by: Paul Mundt --- arch/sh/mm/pmb.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/sh/mm/pmb.c b/arch/sh/mm/pmb.c index e9f5384f3f1c..18623ba751b3 100644 --- a/arch/sh/mm/pmb.c +++ b/arch/sh/mm/pmb.c @@ -341,6 +341,8 @@ int pmb_bolt_mapping(unsigned long vaddr, phys_addr_t phys, unsigned long flags, pmb_flags; int i, mapped; + if (size < SZ_16M) + return -EINVAL; if (!pmb_addr_valid(vaddr, size)) return -EFAULT; if (pmb_mapping_exists(vaddr, phys, size)) -- cgit v1.2.1