ARM: make_coherent: avoid recalculating the pfn for the modified page

We already know the pfn for the page to be modified in make_coherent,
so let's stop recalculating it unnecessarily.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 6 insertions, 6 deletions

diff --git a/arch/arm/mm/fault-armv.c b/arch/arm/mm/fault-armv.c
index 8e9bc517132e..ae88f2c3a6df 100644
--- a/arch/arm/mm/fault-armv.c
+++ b/arch/arm/mm/fault-armv.c
@@ -37,7 +37,7 @@ static unsigned long shared_pte_mask = L_PTE_MT_BUFFERABLE;
  * without CONFIG_CPU_CACHE_VIPT) cannot support split page_table_lock.
  */
 static int do_adjust_pte(struct vm_area_struct *vma, unsigned long address,
-        pte_t *ptep)
+        unsigned long pfn, pte_t *ptep)
 {
         pte_t entry = *ptep;
         int ret;
@@ -52,7 +52,6 @@ static int do_adjust_pte(struct vm_area_struct *vma, unsigned long address,
          * fault (ie, is old), we can safely ignore any issues.
          */
         if (ret && (pte_val(entry) & L_PTE_MT_MASK) != shared_pte_mask) {
-                unsigned long pfn = pte_pfn(entry);
                 flush_cache_page(vma, address, pfn);
                 outer_flush_range((pfn << PAGE_SHIFT),
                                   (pfn << PAGE_SHIFT) + PAGE_SIZE);
@@ -65,7 +64,8 @@ static int do_adjust_pte(struct vm_area_struct *vma, unsigned long address,
         return ret;
 }
 
-static int adjust_pte(struct vm_area_struct *vma, unsigned long address)
+static int adjust_pte(struct vm_area_struct *vma, unsigned long address,
+        unsigned long pfn)
 {
         spinlock_t *ptl;
         pgd_t *pgd;
@@ -90,7 +90,7 @@ static int adjust_pte(struct vm_area_struct *vma, unsigned long address)
         pte = pte_offset_map_nested(pmd, address);
         spin_lock(ptl);
 
-        ret = do_adjust_pte(vma, address, pte);
+        ret = do_adjust_pte(vma, address, pfn, pte);
 
         spin_unlock(ptl);
         pte_unmap_nested(pte);
@@ -127,11 +127,11 @@ make_coherent(struct address_space *mapping, struct vm_area_struct *vma, unsigne
                 if (!(mpnt->vm_flags & VM_MAYSHARE))
                         continue;
                 offset = (pgoff - mpnt->vm_pgoff) << PAGE_SHIFT;
-                aliases += adjust_pte(mpnt, mpnt->vm_start + offset);
+                aliases += adjust_pte(mpnt, mpnt->vm_start + offset, pfn);
         }
         flush_dcache_mmap_unlock(mapping);
         if (aliases)
-                adjust_pte(vma, addr);
+                adjust_pte(vma, addr, pfn);
         else
                 flush_cache_page(vma, addr, pfn);
 }