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mm: cleanup: remove #ifdef CONFIG_MIGRATION 

#ifdef in *.c file decrease source readability a bit.  removing is better.

This patch doesn't have any functional change.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
KOSAKI Motohiro 2009-01-06 14:39:16 -08:00 committed by Linus Torvalds
parent 1b0bd11886
commit 64cdd548ff
3 changed files with 9 additions and 11 deletions
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4
include/linux/migrate.h
View File

@ -7,6 +7,8 @@
typedef struct page *new_page_t(struct page *, unsigned long private, int **);
#ifdef CONFIG_MIGRATION
#define PAGE_MIGRATION 1
extern int putback_lru_pages(struct list_head *l);
extern int migrate_page(struct address_space *,
struct page *, struct page *);
@ -20,6 +22,8 @@ extern int migrate_vmas(struct mm_struct *mm,
const nodemask_t *from, const nodemask_t *to,
unsigned long flags);
#else
#define PAGE_MIGRATION 0
static inline int putback_lru_pages(struct list_head *l) { return 0; }
static inline int migrate_pages(struct list_head *l, new_page_t x,
unsigned long private) { return -ENOSYS; }

6
mm/mprotect.c
View File

@ -22,6 +22,7 @@
#include <linux/swap.h>
#include <linux/swapops.h>
#include <linux/mmu_notifier.h>
#include <linux/migrate.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/cacheflush.h>
@ -59,8 +60,7 @@ static void change_pte_range(struct mm_struct *mm, pmd_t *pmd,
ptent = pte_mkwrite(ptent);
ptep_modify_prot_commit(mm, addr, pte, ptent);
#ifdef CONFIG_MIGRATION
} else if (!pte_file(oldpte)) {
} else if (PAGE_MIGRATION && !pte_file(oldpte)) {
swp_entry_t entry = pte_to_swp_entry(oldpte);
if (is_write_migration_entry(entry)) {
@ -72,9 +72,7 @@ static void change_pte_range(struct mm_struct *mm, pmd_t *pmd,
set_pte_at(mm, addr, pte,
swp_entry_to_pte(entry));
}
#endif
}
} while (pte++, addr += PAGE_SIZE, addr != end);
arch_leave_lazy_mmu_mode();
pte_unmap_unlock(pte - 1, ptl);

10
mm/rmap.c
View File

@ -50,6 +50,7 @@
#include <linux/kallsyms.h>
#include <linux/memcontrol.h>
#include <linux/mmu_notifier.h>
#include <linux/migrate.h>
#include <asm/tlbflush.h>
@ -818,8 +819,7 @@ static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
spin_unlock(&mmlist_lock);
}
dec_mm_counter(mm, anon_rss);
#ifdef CONFIG_MIGRATION
} else {
} else if (PAGE_MIGRATION) {
/*
* Store the pfn of the page in a special migration
* pte. do_swap_page() will wait until the migration
@ -827,19 +827,15 @@ static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
*/
BUG_ON(!migration);
entry = make_migration_entry(page, pte_write(pteval));
#endif
}
set_pte_at(mm, address, pte, swp_entry_to_pte(entry));
BUG_ON(pte_file(*pte));
} else
#ifdef CONFIG_MIGRATION
if (migration) {
} else if (PAGE_MIGRATION && migration) {
/* Establish migration entry for a file page */
swp_entry_t entry;
entry = make_migration_entry(page, pte_write(pteval));
set_pte_at(mm, address, pte, swp_entry_to_pte(entry));
} else
#endif
dec_mm_counter(mm, file_rss);