Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc

* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc:
  [POWERPC] Fix size check for hugetlbfs
  [POWERPC] Fix initialization and usage of dma_mask
  [POWERPC] Fix more section mismatches in head_64.S
  [POWERPC] Revert "[POWERPC] Add 'mdio' to bus scan id list for platforms with QE UEC"
  [POWERPC] PS3: Update ps3_defconfig
  [POWERPC] PS3: Remove text saying PS3 support is incomplete
  [POWERPC] PS3: Fix storage probe logic
  [POWERPC] cell: Move SPU affinity init to spu_management_of_ops
  [POWERPC] Fix potential duplicate entry in SLB shadow buffer

1 files changed, 16 insertions, 29 deletions

diff --git a/arch/powerpc/mm/slb.c b/arch/powerpc/mm/slb.c
index b0697017d0e8..a73d2d700973 100644
--- a/arch/powerpc/mm/slb.c
+++ b/arch/powerpc/mm/slb.c
@@ -69,20 +69,9 @@ static inline void slb_shadow_update(unsigned long ea,
 	smp_wmb();
 }
 
-static inline void create_shadowed_slbe(unsigned long ea, unsigned long flags,
-					unsigned long entry)
+static inline void slb_shadow_clear(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" );
+	get_slb_shadow()->save_area[entry].esid = 0;
 }
 
 void slb_flush_and_rebolt(void)
@@ -100,11 +89,13 @@ void slb_flush_and_rebolt(void)
 	vflags = SLB_VSID_KERNEL | vmalloc_llp;
 
 	ksp_esid_data = mk_esid_data(get_paca()->kstack, 2);
-	if ((ksp_esid_data & ESID_MASK) == PAGE_OFFSET)
+	if ((ksp_esid_data & ESID_MASK) == PAGE_OFFSET) {
 		ksp_esid_data &= ~SLB_ESID_V;
-
-	/* Only third entry (stack) may change here so only resave that */
-	slb_shadow_update(get_paca()->kstack, lflags, 2);
+		slb_shadow_clear(2);
+	} else {
+		/* Update stack entry; others don't change */
+		slb_shadow_update(get_paca()->kstack, lflags, 2);
+	}
 
 	/* We need to do this all in asm, so we're sure we don't touch
 	 * the stack between the slbia and rebolting it. */
@@ -235,16 +226,12 @@ void slb_initialize(void)
 	vflags = SLB_VSID_KERNEL | vmalloc_llp;
 
 	/* Invalidate the entire SLB (even slot 0) & all the ERATS */
-	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");
+	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();
 }