From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Subject: mm: uninline page_mapped()
It's huge. Uninlining it saves 206 bytes per callsite. Shaves 4924 bytes
from the x86_64 allmodconfig vmlinux.
[akpm@xxxxxxxxxxxxxxxxxxxx: coding-style fixes]
Cc: Steve Capper <steve.capper@xxxxxxx>
Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/mm.h | 21 +--------------------
mm/util.c | 23 +++++++++++++++++++++++
2 files changed, 24 insertions(+), 20 deletions(-)
diff -puN include/linux/mm.h~mm-uninline-page_mapped include/linux/mm.h
--- a/include/linux/mm.h~mm-uninline-page_mapped
+++ a/include/linux/mm.h
@@ -1032,26 +1032,7 @@ static inline pgoff_t page_file_index(st
return page->index;
}
-/*
- * Return true if this page is mapped into pagetables.
- * For compound page it returns true if any subpage of compound page is mapped.
- */
-static inline bool page_mapped(struct page *page)
-{
- int i;
- if (likely(!PageCompound(page)))
- return atomic_read(&page->_mapcount) >= 0;
- page = compound_head(page);
- if (atomic_read(compound_mapcount_ptr(page)) >= 0)
- return true;
- if (PageHuge(page))
- return false;
- for (i = 0; i < hpage_nr_pages(page); i++) {
- if (atomic_read(&page[i]._mapcount) >= 0)
- return true;
- }
- return false;
-}
+bool page_mapped(struct page *page);
/*
* Return true only if the page has been allocated with
diff -puN mm/util.c~mm-uninline-page_mapped mm/util.c
--- a/mm/util.c~mm-uninline-page_mapped
+++ a/mm/util.c
@@ -346,6 +346,29 @@ void *page_rmapping(struct page *page)
return __page_rmapping(page);
}
+/*
+ * Return true if this page is mapped into pagetables.
+ * For compound page it returns true if any subpage of compound page is mapped.
+ */
+bool page_mapped(struct page *page)
+{
+ int i;
+
+ if (likely(!PageCompound(page)))
+ return atomic_read(&page->_mapcount) >= 0;
+ page = compound_head(page);
+ if (atomic_read(compound_mapcount_ptr(page)) >= 0)
+ return true;
+ if (PageHuge(page))
+ return false;
+ for (i = 0; i < hpage_nr_pages(page); i++) {
+ if (atomic_read(&page[i]._mapcount) >= 0)
+ return true;
+ }
+ return false;
+}
+EXPORT_SYMBOL(page_mapped);
+
struct anon_vma *page_anon_vma(struct page *page)
{
unsigned long mapping;
_
--
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