target/linux/generic/backport-4.9/042-mm-rename-__page_frag-functions-to-__page_frag_cache.patch

   1 From: Alexander Duyck <alexander.h.duyck@intel.com>
   2 Date: Tue, 10 Jan 2017 16:58:09 -0800
   3 Subject: [PATCH] mm: rename __page_frag functions to __page_frag_cache, drop
   4  order from drain
   5
   6 This patch does two things.
   7
   8 First it goes through and renames the __page_frag prefixed functions to
   9 __page_frag_cache so that we can be clear that we are draining or
  10 refilling the cache, not the frags themselves.
  11
  12 Second we drop the order parameter from __page_frag_cache_drain since we
  13 don't actually need to pass it since all fragments are either order 0 or
  14 must be a compound page.
  15
  16 Link: http://lkml.kernel.org/r/20170104023954.13451.5678.stgit@localhost.localdomain
  17 Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
  18 Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
  19 Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
  20 ---
  21
  22 --- a/include/linux/gfp.h
  23 +++ b/include/linux/gfp.h
  24 @@ -529,8 +529,7 @@ extern void free_hot_cold_page(struct pa
  25  extern void free_hot_cold_page_list(struct list_head *list, bool cold);
  26
  27  struct page_frag_cache;
  28 -extern void __page_frag_drain(struct page *page, unsigned int order,
  29 -                             unsigned int count);
  30 +extern void __page_frag_cache_drain(struct page *page, unsigned int count);
  31  extern void *page_frag_alloc(struct page_frag_cache *nc,
  32                              unsigned int fragsz, gfp_t gfp_mask);
  33  extern void page_frag_free(void *addr);
  34 --- a/mm/page_alloc.c
  35 +++ b/mm/page_alloc.c
  36 @@ -3914,8 +3914,8 @@ EXPORT_SYMBOL(free_pages);
  37   * drivers to provide a backing region of memory for use as either an
  38   * sk_buff->head, or to be used in the "frags" portion of skb_shared_info.
  39   */
  40 -static struct page *__page_frag_refill(struct page_frag_cache *nc,
  41 -                                      gfp_t gfp_mask)
  42 +static struct page *__page_frag_cache_refill(struct page_frag_cache *nc,
  43 +                                            gfp_t gfp_mask)
  44  {
  45         struct page *page = NULL;
  46         gfp_t gfp = gfp_mask;
  47 @@ -3935,19 +3935,20 @@ static struct page *__page_frag_refill(s
  48         return page;
  49  }
  50
  51 -void __page_frag_drain(struct page *page, unsigned int order,
  52 -                      unsigned int count)
  53 +void __page_frag_cache_drain(struct page *page, unsigned int count)
  54  {
  55         VM_BUG_ON_PAGE(page_ref_count(page) == 0, page);
  56
  57         if (page_ref_sub_and_test(page, count)) {
  58 +               unsigned int order = compound_order(page);
  59 +
  60                 if (order == 0)
  61                         free_hot_cold_page(page, false);
  62                 else
  63                         __free_pages_ok(page, order);
  64         }
  65  }
  66 -EXPORT_SYMBOL(__page_frag_drain);
  67 +EXPORT_SYMBOL(__page_frag_cache_drain);
  68
  69  void *page_frag_alloc(struct page_frag_cache *nc,
  70                       unsigned int fragsz, gfp_t gfp_mask)
  71 @@ -3958,7 +3959,7 @@ void *page_frag_alloc(struct page_frag_c
  72
  73         if (unlikely(!nc->va)) {
  74  refill:
  75 -               page = __page_frag_refill(nc, gfp_mask);
  76 +               page = __page_frag_cache_refill(nc, gfp_mask);
  77                 if (!page)
  78                         return NULL;
  79