powerpc/book3e: Fix check for linear mapping in TLB miss handler

The previous code added wrong TLBs and causes machine check errors if
a driver accessed passed the end of the linear mapping instead of
a clean page fault.

Signed-off-by: Ralph E. Bellofatto <ralphbel@us.ibm.com>
Signed-off-by: Benjamin Krill <ben@codiert.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/arch/powerpc/mm/tlb_low_64e.S b/arch/powerpc/mm/tlb_low_64e.S
index c95eb323e9ae..6bf50507a4b5 100644
--- a/arch/powerpc/mm/tlb_low_64e.S
+++ b/arch/powerpc/mm/tlb_low_64e.S
@@ -1091,7 +1091,8 @@ tlb_load_linear:
         ld      r11,PACATOC(r13)
         ld      r11,linear_map_top@got(r11)
         ld      r10,0(r11)
-        cmpld   cr0,r10,r16
+        tovirt(10,10)
+        cmpld   cr0,r16,r10
         bge     tlb_load_linear_fault
 
         /* MAS1 need whole new setup. */