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>

diff --git a/arch/powerpc/mm/tlb_low_64e.S b/arch/powerpc/mm/tlb_low_64e.S
index c95eb32..6bf5050 100644 (file)
--- 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. */