Merge branch 'linux-2.6' into for-2.6.24

1 files changed, 28 insertions, 8 deletions

diff --git a/arch/powerpc/mm/slb.c b/arch/powerpc/mm/slb.c
index a73d2d700973..ff1811ac6c81 100644
--- a/arch/powerpc/mm/slb.c
+++ b/arch/powerpc/mm/slb.c
@@ -74,6 +74,22 @@ static inline void slb_shadow_clear(unsigned long entry)
 	get_slb_shadow()->save_area[entry].esid = 0;
 }
 
+static inline void create_shadowed_slbe(unsigned long ea, unsigned long flags,
+					unsigned long entry)
+{
+	/*
+	 * Updating the shadow buffer before writing the SLB ensures
+	 * we don't get a stale entry here if we get preempted by PHYP
+	 * between these two statements.
+	 */
+	slb_shadow_update(ea, flags, entry);
+
+	asm volatile("slbmte  %0,%1" :
+		     : "r" (mk_vsid_data(ea, flags)),
+		       "r" (mk_esid_data(ea, entry))
+		     : "memory" );
+}
+
 void slb_flush_and_rebolt(void)
 {
 	/* If you change this make sure you change SLB_NUM_BOLTED
@@ -226,12 +242,16 @@ void slb_initialize(void)
 	vflags = SLB_VSID_KERNEL | vmalloc_llp;
 
 	/* Invalidate the entire SLB (even slot 0) & all the ERATS */
-	slb_shadow_update(PAGE_OFFSET, lflags, 0);
-	asm volatile("isync; slbia; sync; slbmte  %0,%1; isync" ::
-		     "r" (get_slb_shadow()->save_area[0].vsid),
-		     "r" (get_slb_shadow()->save_area[0].esid) : "memory");
-
-	slb_shadow_update(VMALLOC_START, vflags, 1);
-
-	slb_flush_and_rebolt();
+	asm volatile("isync":::"memory");
+	asm volatile("slbmte  %0,%0"::"r" (0) : "memory");
+	asm volatile("isync; slbia; isync":::"memory");
+	create_shadowed_slbe(PAGE_OFFSET, lflags, 0);
+
+	create_shadowed_slbe(VMALLOC_START, vflags, 1);
+
+	/* We don't bolt the stack for the time being - we're in boot,
+	 * so the stack is in the bolted segment.  By the time it goes
+	 * elsewhere, we'll call _switch() which will bolt in the new
+	 * one. */
+	asm volatile("isync":::"memory");
 }