mm/page_ext.c: constify lookup_page_ext() argument

lookup_page_ext() finds 'struct page_ext' for a given page.  It requires
only read access to the given struct page.

Current implemnentation takes 'struct page *' as an argument.  It makes
compiler complain when 'const struct page *' passed.

Change the argument to 'const struct page *'.

Link: http://lkml.kernel.org/r/20180531135457.20167-3-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Vinayak Menon <vinmenon@codeaurora.org>
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/page_ext.c b/mm/page_ext.c
index 5295ef331165..a9826da84ccb 100644
--- a/mm/page_ext.c
+++ b/mm/page_ext.c
@@ -120,7 +120,7 @@ void __meminit pgdat_page_ext_init(struct pglist_data *pgdat)
         pgdat->node_page_ext = NULL;
 }
 
-struct page_ext *lookup_page_ext(struct page *page)
+struct page_ext *lookup_page_ext(const struct page *page)
 {
         unsigned long pfn = page_to_pfn(page);
         unsigned long index;
@@ -195,7 +195,7 @@ fail:
 
 #else /* CONFIG_FLAT_NODE_MEM_MAP */
 
-struct page_ext *lookup_page_ext(struct page *page)
+struct page_ext *lookup_page_ext(const struct page *page)
 {
         unsigned long pfn = page_to_pfn(page);
         struct mem_section *section = __pfn_to_section(pfn);