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mm: uninline and cleanup page-mapping related helpers 

Most-used page->mapping helper -- page_mapping() -- has already uninlined.
 Let's uninline also page_rmapping() and page_anon_vma().  It saves us
depending on configuration around 400 bytes in text:

   text	   data	    bss	    dec	    hex	filename
 660318	  99254	 410000	1169572	 11d8a4	mm/built-in.o-before
 659854	  99254	 410000	1169108	 11d6d4	mm/built-in.o

I also tried to make code a bit more clean.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Konstantin Khlebnikov <koct9i@gmail.com>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kirill A. Shutemov 2015-04-15 16:14:53 -07:00 committed by Linus Torvalds
parent 99e8ea6cd2
commit e39155ea11
3 changed files with 38 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
include/linux/mm.h
View File

@ -950,14 +950,10 @@ void page_address_init(void);
#define page_address_init() do { } while(0)
#endif
extern void *page_rmapping(struct page *page);
extern struct anon_vma *page_anon_vma(struct page *page);
extern struct address_space *page_mapping(struct page *page);
/* Neutral page->mapping pointer to address_space or anon_vma or other */
static inline void *page_rmapping(struct page *page)
{
return (void *)((unsigned long)page->mapping & ~PAGE_MAPPING_FLAGS);
}
extern struct address_space *__page_file_mapping(struct page *);
static inline

8
include/linux/rmap.h
View File

@ -105,14 +105,6 @@ static inline void put_anon_vma(struct anon_vma *anon_vma)
__put_anon_vma(anon_vma);
}
static inline struct anon_vma *page_anon_vma(struct page *page)
{
if (((unsigned long)page->mapping & PAGE_MAPPING_FLAGS) !=
PAGE_MAPPING_ANON)
return NULL;
return page_rmapping(page);
}
static inline void vma_lock_anon_vma(struct vm_area_struct *vma)
{
struct anon_vma *anon_vma = vma->anon_vma;

41
mm/util.c
View File

@ -325,9 +325,37 @@ void kvfree(const void *addr)
}
EXPORT_SYMBOL(kvfree);
static inline void *__page_rmapping(struct page *page)
{
unsigned long mapping;
mapping = (unsigned long)page->mapping;
mapping &= ~PAGE_MAPPING_FLAGS;
return (void *)mapping;
}
/* Neutral page->mapping pointer to address_space or anon_vma or other */
void *page_rmapping(struct page *page)
{
page = compound_head(page);
return __page_rmapping(page);
}
struct anon_vma *page_anon_vma(struct page *page)
{
unsigned long mapping;
page = compound_head(page);
mapping = (unsigned long)page->mapping;
if ((mapping & PAGE_MAPPING_FLAGS) != PAGE_MAPPING_ANON)
return NULL;
return __page_rmapping(page);
}
struct address_space *page_mapping(struct page *page)
{
struct address_space *mapping = page->mapping;
unsigned long mapping;
/* This happens if someone calls flush_dcache_page on slab page */
if (unlikely(PageSlab(page)))
@ -337,10 +365,13 @@ struct address_space *page_mapping(struct page *page)
swp_entry_t entry;
entry.val = page_private(page);
mapping = swap_address_space(entry);
} else if ((unsigned long)mapping & PAGE_MAPPING_ANON)
mapping = NULL;
return mapping;
return swap_address_space(entry);
}
mapping = (unsigned long)page->mapping;
if (mapping & PAGE_MAPPING_FLAGS)
return NULL;
return page->mapping;
}
int overcommit_ratio_handler(struct ctl_table *table, int write,