powerpc/8xx: Invalidate non present TLBs

8xx sometimes need to load a invalid/non-present TLBs in
it DTLB asm handler.

These must be invalidated separaly as linux mm don't.

Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index e7dae82..26fb6b9 100644 (file)
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -40,7 +40,7 @@
 #include <asm/uaccess.h>
 #include <asm/tlbflush.h>
 #include <asm/siginfo.h>
 #include <asm/uaccess.h>
 #include <asm/tlbflush.h>
 #include <asm/siginfo.h>

-
+#include <mm/mmu_decl.h>

 
 #ifdef CONFIG_KPROBES
 static inline int notify_page_fault(struct pt_regs *regs)
 
 #ifdef CONFIG_KPROBES
 static inline int notify_page_fault(struct pt_regs *regs)


@@ -246,6 +246,12 @@ good_area:
                goto bad_area;
 #endif /* CONFIG_6xx */
 #if defined(CONFIG_8xx)
                goto bad_area;
 #endif /* CONFIG_6xx */
 #if defined(CONFIG_8xx)

+       /* 8xx sometimes need to load a invalid/non-present TLBs.
+        * These must be invalidated separately as linux mm don't.
+        */
+       if (error_code & 0x40000000) /* no translation? */
+               _tlbil_va(address, 0, 0, 0);
+

         /* The MPC8xx seems to always set 0x80000000, which is
          * "undefined".  Of those that can be set, this is the only
          * one which seems bad.
         /* The MPC8xx seems to always set 0x80000000, which is
          * "undefined".  Of those that can be set, this is the only
          * one which seems bad.