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

* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc:
  Fix build of cpm_uart due to core changes
  powerpc/8xx: Fix regression introduced by cache coherency rewrite
  powerpc/4xx: Fix erroneous xmon warning on PowerPC 4xx
  powerpc/mm: Fix 40x and 8xx vs. _PAGE_SPECIAL
  powerpc: Cleanup linker script using new linker script macros.
  powerpc: Fix ibm,client-architecture-support printout
  powerpc: Increase NODES_SHIFT on 64bit from 4 to 8
  powerpc/perf_counter: Fix vdso detection
  powerpc: Move 64bit heap above 1TB on machines with 1TB segments
  powerpc: Change archdata dma_data to a union
  powerpc: Rename get_dma_direct_offset get_dma_offset
  powerpc/mm: Remove duplicated #include
  powerpc/book3e-64: Remove duplicated #include
  powerpc: Check for unsupported relocs when using CONFIG_RELOCATABLE
  powerpc/pmc: Don't access lppaca on Book3E
  powerpc: kmalloc failure ignored in vio_build_iommu_table()
  hvc_console: Provide (un)locked version for hvc_resize()

1 files changed, 16 insertions, 3 deletions

diff --git a/arch/powerpc/mm/pgtable.c b/arch/powerpc/mm/pgtable.c
index 83f1551ec2c9..53040931de32 100644
--- a/arch/powerpc/mm/pgtable.c
+++ b/arch/powerpc/mm/pgtable.c
@@ -30,6 +30,8 @@
 #include <asm/tlbflush.h>
 #include <asm/tlb.h>
 
+#include "mmu_decl.h"
+
 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
 
 #ifdef CONFIG_SMP
@@ -166,7 +168,7 @@ struct page * maybe_pte_to_page(pte_t pte)
  * support falls into the same category.
  */
 
-static pte_t set_pte_filter(pte_t pte)
+static pte_t set_pte_filter(pte_t pte, unsigned long addr)
 {
         pte = __pte(pte_val(pte) & ~_PAGE_HPTEFLAGS);
         if (pte_looks_normal(pte) && !(cpu_has_feature(CPU_FTR_COHERENT_ICACHE) ||
@@ -175,6 +177,17 @@ static pte_t set_pte_filter(pte_t pte)
                 if (!pg)
                         return pte;
                 if (!test_bit(PG_arch_1, &pg->flags)) {
+#ifdef CONFIG_8xx
+                        /* On 8xx, cache control instructions (particularly
+                         * "dcbst" from flush_dcache_icache) fault as write
+                         * operation if there is an unpopulated TLB entry
+                         * for the address in question. To workaround that,
+                         * we invalidate the TLB here, thus avoiding dcbst
+                         * misbehaviour.
+                         */
+                        /* 8xx doesn't care about PID, size or ind args */
+                        _tlbil_va(addr, 0, 0, 0);
+#endif /* CONFIG_8xx */
                         flush_dcache_icache_page(pg);
                         set_bit(PG_arch_1, &pg->flags);
                 }
@@ -194,7 +207,7 @@ static pte_t set_access_flags_filter(pte_t pte, struct vm_area_struct *vma,
  * as we don't have two bits to spare for _PAGE_EXEC and _PAGE_HWEXEC so
  * instead we "filter out" the exec permission for non clean pages.
  */
-static pte_t set_pte_filter(pte_t pte)
+static pte_t set_pte_filter(pte_t pte, unsigned long addr)
 {
         struct page *pg;
 
@@ -276,7 +289,7 @@ void set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep,
          * this context might not have been activated yet when this
          * is called.
          */
-        pte = set_pte_filter(pte);
+        pte = set_pte_filter(pte, addr);
 
         /* Perform the setting of the PTE */
         __set_pte_at(mm, addr, ptep, pte, 0);