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Subject[PATCH 3/3] slob: record page flag overlays explicitly
Date

SLOB reuses two page bits for internal purposes, it overlays PG_active
and PG_private. This is hidden away in slob.c. Document these overlays
explicitly in the main page-flags enum along with all the others.

Signed-off-by: Andy Whitcroft <apw@shadowen.org>
---
include/linux/page-flags.h | 7 +++++++
mm/slob.c | 12 ++++++------
2 files changed, 13 insertions(+), 6 deletions(-)
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index dfd0a26..43b3598 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -104,6 +104,10 @@ enum pageflags {
/* XEN */
PG_pinned = PG_owner_priv_1,

+ /* SLOB */
+ PG_slob_page = PG_active,
+ PG_slob_free = PG_private,
+
/* SLUB */
PG_slub_frozen = PG_active,
PG_slub_debug = PG_error,
@@ -171,6 +175,9 @@ PAGEFLAG(Reserved, reserved) __CLEARPAGEFLAG(Reserved, reserved)
PAGEFLAG(Private, private) __CLEARPAGEFLAG(Private, private)
__SETPAGEFLAG(Private, private)

+__PAGEFLAG(SlobPage, slob_page)
+__PAGEFLAG(SlobFree, slob_free)
+
__PAGEFLAG(SlubFrozen, slub_frozen)
__PAGEFLAG(SlubDebug, slub_debug)

diff --git a/mm/slob.c b/mm/slob.c
index 6038cba..2d18d89 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -130,17 +130,17 @@ static LIST_HEAD(free_slob_large);
*/
static inline int slob_page(struct slob_page *sp)
{
- return test_bit(PG_active, &sp->flags);
+ return PageSlobPage((struct page *)sp);
}

static inline void set_slob_page(struct slob_page *sp)
{
- __set_bit(PG_active, &sp->flags);
+ __SetPageSlobPage((struct page *)sp);
}

static inline void clear_slob_page(struct slob_page *sp)
{
- __clear_bit(PG_active, &sp->flags);
+ __ClearPageSlobPage((struct page *)sp);
}

/*
@@ -148,19 +148,19 @@ static inline void clear_slob_page(struct slob_page *sp)
*/
static inline int slob_page_free(struct slob_page *sp)
{
- return test_bit(PG_private, &sp->flags);
+ return PageSlobFree((struct page *)sp);
}

static void set_slob_page_free(struct slob_page *sp, struct list_head *list)
{
list_add(&sp->list, list);
- __set_bit(PG_private, &sp->flags);
+ __SetPageSlobFree((struct page *)sp);
}

static inline void clear_slob_page_free(struct slob_page *sp)
{
list_del(&sp->list);
- __clear_bit(PG_private, &sp->flags);
+ __ClearPageSlobFree((struct page *)sp);
}

#define SLOB_UNIT sizeof(slob_t)

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