The biggest problem for me turned out to be the MMU context IDs being
clamped to 32 when the 8xx only has 16. With this, things are a bit more
stable :)
diff --git a/arch/powerpc/mm/mmu_context_nohash.c
b/arch/powerpc/mm/mmu_context_nohash.c
index c2f93dc..15e00c5 100644
--- a/arch/powerpc/mm/mmu_context_nohash.c
+++ b/arch/powerpc/mm/mmu_context_nohash.c
@@ -404,7 +404,8 @@ void __init mmu_context_init(void)
}
#ifdef DEBUG_CLAMP_LAST_CONTEXT
- last_context = DEBUG_CLAMP_LAST_CONTEXT;
+ if (last_context > DEBUG_CLAMP_LAST_CONTEXT)
+ last_context = DEBUG_CLAMP_LAST_CONTEXT;
#endif
/*
* Allocate the maps used by context management
diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index e7dae82..26fb6b9 100644
--- 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 <mm/mmu_decl.h>
#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)
+ /* 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.
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