3 files changed, 37 insertions, 3 deletions

diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index 706e8a63ced9..a33583f3b0e7 100644
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -601,7 +601,7 @@ int hash_page(unsigned long ea, unsigned long access, unsigned long trap)
         /* Handle hugepage regions */
         if (unlikely(in_hugepage_area(mm->context, ea))) {
                 DBG_LOW(" -> huge page !\n");
-                return hash_huge_page(mm, access, ea, vsid, local);
+                return hash_huge_page(mm, access, ea, vsid, local, trap);
         }
 
         /* Get PTE and page size from page tables */
diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
index 8bce515dc320..97512b89e7b0 100644
--- a/arch/powerpc/mm/hugetlbpage.c
+++ b/arch/powerpc/mm/hugetlbpage.c
@@ -639,8 +639,36 @@ unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
         return -ENOMEM;
 }
 
+/*
+ * Called by asm hashtable.S for doing lazy icache flush
+ */
+static unsigned int hash_huge_page_do_lazy_icache(unsigned long rflags,
+                                                  pte_t pte, int trap)
+{
+        struct page *page;
+        int i;
+
+        if (!pfn_valid(pte_pfn(pte)))
+                return rflags;
+
+        page = pte_page(pte);
+
+        /* page is dirty */
+        if (!test_bit(PG_arch_1, &page->flags) && !PageReserved(page)) {
+                if (trap == 0x400) {
+                        for (i = 0; i < (HPAGE_SIZE / PAGE_SIZE); i++)
+                                __flush_dcache_icache(page_address(page+i));
+                        set_bit(PG_arch_1, &page->flags);
+                } else {
+                        rflags |= HPTE_R_N;
+                }
+        }
+        return rflags;
+}
+
 int hash_huge_page(struct mm_struct *mm, unsigned long access,
-                   unsigned long ea, unsigned long vsid, int local)
+                   unsigned long ea, unsigned long vsid, int local,
+                   unsigned long trap)
 {
         pte_t *ptep;
         unsigned long old_pte, new_pte;
@@ -691,6 +719,11 @@ int hash_huge_page(struct mm_struct *mm, unsigned long access,
         rflags = 0x2 | (!(new_pte & _PAGE_RW));
         /* _PAGE_EXEC -> HW_NO_EXEC since it's inverted */
         rflags |= ((new_pte & _PAGE_EXEC) ? 0 : HPTE_R_N);
+        if (!cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
+                /* No CPU has hugepages but lacks no execute, so we
+                 * don't need to worry about that case */
+                rflags = hash_huge_page_do_lazy_icache(rflags, __pte(old_pte),
+                                                       trap);
 
         /* Check if pte already has an hpte (case 2) */
         if (unlikely(old_pte & _PAGE_HASHPTE)) {
diff --git a/include/asm-powerpc/mmu.h b/include/asm-powerpc/mmu.h
index c1b4bbabbe97..29b0bb0086d3 100644
--- a/include/asm-powerpc/mmu.h
+++ b/include/asm-powerpc/mmu.h
@@ -220,7 +220,8 @@ extern int __hash_page_64K(unsigned long ea, unsigned long access,
                            unsigned int local);
 struct mm_struct;
 extern int hash_huge_page(struct mm_struct *mm, unsigned long access,
-                          unsigned long ea, unsigned long vsid, int local);
+                          unsigned long ea, unsigned long vsid, int local,
+                          unsigned long trap);
 
 extern void htab_finish_init(void);
 extern int htab_bolt_mapping(unsigned long vstart, unsigned long vend,