powerpc: Get the number of SLBs from "slb-size" property

The PAPR says that the property for specifying the number of SLBs should
be called "slb-size".  We currently only look for "ibm,slb-size" because
this is what firmware actually presents.

This patch makes us look for the "slb-size" property as well and in
preference to the "ibm,slb-size".  This should future proof us if
firmware changes to match PAPR.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index c09cffafb6ee..f00f83109ab3 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -590,6 +590,11 @@ static void __init check_cpu_slb_size(unsigned long node)
 {
         u32 *slb_size_ptr;
 
+        slb_size_ptr = of_get_flat_dt_prop(node, "slb-size", NULL);
+        if (slb_size_ptr != NULL) {
+                mmu_slb_size = *slb_size_ptr;
+                return;
+        }
         slb_size_ptr = of_get_flat_dt_prop(node, "ibm,slb-size", NULL);
         if (slb_size_ptr != NULL) {
                 mmu_slb_size = *slb_size_ptr;