mm/swap_state.c: make bool enable_vma_readahead and swap_vma_readahead() static

The bool enable_vma_readahead and swap_vma_readahead() are local to the
source and do not need to be in global scope, so make them static.

Cleans up sparse warnings:

  mm/swap_state.c:41:6: warning: symbol 'enable_vma_readahead' was not declared. Should it be static?
  mm/swap_state.c:742:13: warning: symbol 'swap_vma_readahead' was not declared. Should it be static?

Link: http://lkml.kernel.org/r/20180223164852.5159-1-colin.king@canonical.com
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: "Huang, Ying" <ying.huang@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/mm/swap_state.c b/mm/swap_state.c
index b97da97b6846..f233dccd3b1b 100644
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -38,7 +38,7 @@ static const struct address_space_operations swap_aops = {
 
 struct address_space *swapper_spaces[MAX_SWAPFILES] __read_mostly;
 static unsigned int nr_swapper_spaces[MAX_SWAPFILES] __read_mostly;
-bool enable_vma_readahead __read_mostly = true;
+static bool enable_vma_readahead __read_mostly = true;
 
 #define SWAP_RA_WIN_SHIFT       (PAGE_SHIFT / 2)
 #define SWAP_RA_HITS_MASK       ((1UL << SWAP_RA_WIN_SHIFT) - 1)
@@ -733,8 +733,8 @@ static void swap_ra_info(struct vm_fault *vmf,
         pte_unmap(orig_pte);
 }
 
-struct page *swap_vma_readahead(swp_entry_t fentry, gfp_t gfp_mask,
-                                    struct vm_fault *vmf)
+static struct page *swap_vma_readahead(swp_entry_t fentry, gfp_t gfp_mask,
+                                       struct vm_fault *vmf)
 {
         struct blk_plug plug;
         struct vm_area_struct *vma = vmf->vma;