mm: rename global_page_state to global_zone_page_state

global_page_state is error prone as a recent bug report pointed out [1].
It only returns proper values for zone based counters as the enum it
gets suggests.  We already have global_node_page_state so let's rename
global_page_state to global_zone_page_state to be more explicit here.
All existing users seems to be correct:

$ git grep "global_page_state(NR_" | sed 's@.*(\(NR_[A-Z_]*\)).*@\1@' | sort | uniq -c
      2 NR_BOUNCE
      2 NR_FREE_CMA_PAGES
     11 NR_FREE_PAGES
      1 NR_KERNEL_STACK_KB
      1 NR_MLOCK
      2 NR_PAGETABLE

This patch shouldn't introduce any functional change.

[1] http://lkml.kernel.org/r/201707260628.v6Q6SmaS030814@www262.sakura.ne.jp

Link: http://lkml.kernel.org/r/20170801134256.5400-2-hannes@cmpxchg.org
Signed-off-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Cc: Josef Bacik <josef@toxicpanda.com>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/mm/nommu.c b/mm/nommu.c
index fc184f597d59..53d5175a5c14 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1962,7 +1962,7 @@ static int __meminit init_user_reserve(void)
 {
         unsigned long free_kbytes;
 
-        free_kbytes = global_page_state(NR_FREE_PAGES) << (PAGE_SHIFT - 10);
+        free_kbytes = global_zone_page_state(NR_FREE_PAGES) << (PAGE_SHIFT - 10);
 
         sysctl_user_reserve_kbytes = min(free_kbytes / 32, 1UL << 17);
         return 0;
@@ -1983,7 +1983,7 @@ static int __meminit init_admin_reserve(void)
 {
         unsigned long free_kbytes;
 
-        free_kbytes = global_page_state(NR_FREE_PAGES) << (PAGE_SHIFT - 10);
+        free_kbytes = global_zone_page_state(NR_FREE_PAGES) << (PAGE_SHIFT - 10);
 
         sysctl_admin_reserve_kbytes = min(free_kbytes / 32, 1UL << 13);
         return 0;