powerpc/8xx: Revert commit e0908085fc2391c85b85fb814ae1df377c8e0dcb

The commit e0908085fc2391c85b85fb814ae1df377c8e0dcb ("powerpc/8xx: Fix
regression introduced by cache coherency rewrite") is not needed
anymore.  The issue was because dcbst wrongly sets the store bit when
causing a DTLB error, but this is now fixed by commit
0a2ab51ffb8dfdf51402dcfb446629648c96bc78 ("powerpc/8xx: Fixup DAR from
buggy dcbX instructions.") which handles the buggy dcbx instructions on
data page faults on the 8xx.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
[scottwood@freescale.com: fix commit message]
Signed-off-by: Scott Wood <scottwood@freescale.com>

1 files changed, 3 insertions, 16 deletions

diff --git a/arch/powerpc/mm/pgtable.c b/arch/powerpc/mm/pgtable.c
index edda589795c3..841e0d00863c 100644
--- a/arch/powerpc/mm/pgtable.c
+++ b/arch/powerpc/mm/pgtable.c
@@ -32,8 +32,6 @@
 #include <asm/tlbflush.h>
 #include <asm/tlb.h>
 
-#include "mmu_decl.h"
-
 static inline int is_exec_fault(void)
 {
         return current->thread.regs && TRAP(current->thread.regs) == 0x400;
@@ -72,7 +70,7 @@ struct page * maybe_pte_to_page(pte_t pte)
  * support falls into the same category.
  */
 
-static pte_t set_pte_filter(pte_t pte, unsigned long addr)
+static pte_t set_pte_filter(pte_t pte)
 {
         pte = __pte(pte_val(pte) & ~_PAGE_HPTEFLAGS);
         if (pte_looks_normal(pte) && !(cpu_has_feature(CPU_FTR_COHERENT_ICACHE) ||
@@ -81,17 +79,6 @@ static pte_t set_pte_filter(pte_t pte, unsigned long addr)
                 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);
                 }
@@ -111,7 +98,7 @@ 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, unsigned long addr)
+static pte_t set_pte_filter(pte_t pte)
 {
         struct page *pg;
 
@@ -193,7 +180,7 @@ 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, addr);
+        pte = set_pte_filter(pte);
 
         /* Perform the setting of the PTE */
         __set_pte_at(mm, addr, ptep, pte, 0);