[PATCH] mm: copy_one_pte inc rss

Small adjustment, following Nick's suggestion: it's more straightforward for
copy_pte_range to let copy_one_pte do the rss incrementation, than use an
index it passed back.  Saves a #define, and 16 bytes of .text.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/mm/memory.c b/mm/memory.c
index e83f944..7893eb4 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -340,8 +340,6 @@ static inline void add_mm_rss(struct mm_struct *mm, int file_rss, int anon_rss)
                add_mm_counter(mm, anon_rss, anon_rss);
 }
 
-#define NO_RSS 2       /* Increment neither file_rss nor anon_rss */
-
 /*
  * This function is called to print an error when a pte in a
  * !VM_RESERVED region is found pointing to an invalid pfn (which
@@ -368,16 +366,15 @@ void print_bad_pte(struct vm_area_struct *vma, pte_t pte, unsigned long vaddr)
  * but may be dropped within p[mg]d_alloc() and pte_alloc_map().
  */
 
-static inline int
+static inline void
 copy_one_pte(struct mm_struct *dst_mm, struct mm_struct *src_mm,
                pte_t *dst_pte, pte_t *src_pte, struct vm_area_struct *vma,
-               unsigned long addr)
+               unsigned long addr, int *rss)
 {
        unsigned long vm_flags = vma->vm_flags;
        pte_t pte = *src_pte;
        struct page *page;
        unsigned long pfn;
-       int anon = NO_RSS;
 
        /* pte contains position in swap or file, so copy. */
        if (unlikely(!pte_present(pte))) {
@@ -428,11 +425,10 @@ copy_one_pte(struct mm_struct *dst_mm, struct mm_struct *src_mm,
        pte = pte_mkold(pte);
        get_page(page);
        page_dup_rmap(page);
-       anon = !!PageAnon(page);
+       rss[!!PageAnon(page)]++;
 
 out_set_pte:
        set_pte_at(dst_mm, addr, dst_pte, pte);
-       return anon;
 }
 
 static int copy_pte_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
@@ -441,7 +437,7 @@ static int copy_pte_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
 {
        pte_t *src_pte, *dst_pte;
        int progress = 0;
-       int rss[NO_RSS+1], anon;
+       int rss[2];
 
 again:
        rss[1] = rss[0] = 0;
@@ -467,8 +463,7 @@ again:
                        progress++;
                        continue;
                }
-               anon = copy_one_pte(dst_mm, src_mm, dst_pte, src_pte, vma,addr);
-               rss[anon]++;
+               copy_one_pte(dst_mm, src_mm, dst_pte, src_pte, vma, addr, rss);
                progress += 8;
        } while (dst_pte++, src_pte++, addr += PAGE_SIZE, addr != end);
        spin_unlock(&src_mm->page_table_lock);