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mm: define USE_SPLIT_PTLOCKS rather than repeating expression

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Define USE_SPLIT_PTLOCKS as a constant expression rather than repeating
"NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS" all over the place.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Acked-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jeremy Fitzhardinge 2008-09-09 15:43:22 -07:00 committed by Ingo Molnar
parent adee14b2e1
commit f7d0b926ac
4 changed files with 13 additions and 11 deletions
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2
arch/x86/xen/mmu.c
View File

@ -646,7 +646,7 @@ static spinlock_t *lock_pte(struct page *page)
{
spinlock_t *ptl = NULL;
#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
#if USE_SPLIT_PTLOCKS
ptl = __pte_lockptr(page);
spin_lock(ptl);
#endif

6
include/linux/mm.h
View File

@ -919,7 +919,7 @@ static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long a
}
#endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
#if USE_SPLIT_PTLOCKS
/*
* We tuck a spinlock to guard each pagetable page into its struct page,
* at page->private, with BUILD_BUG_ON to make sure that this will not
@ -932,14 +932,14 @@ static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long a
} while (0)
#define pte_lock_deinit(page) ((page)->mapping = NULL)
#define pte_lockptr(mm, pmd) ({(void)(mm); __pte_lockptr(pmd_page(*(pmd)));})
#else
#else /* !USE_SPLIT_PTLOCKS */
/*
* We use mm->page_table_lock to guard all pagetable pages of the mm.
*/
#define pte_lock_init(page) do {} while (0)
#define pte_lock_deinit(page) do {} while (0)
#define pte_lockptr(mm, pmd) ({(void)(pmd); &(mm)->page_table_lock;})
#endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
#endif /* USE_SPLIT_PTLOCKS */
static inline void pgtable_page_ctor(struct page *page)
{

10
include/linux/mm_types.h
View File

@ -21,11 +21,13 @@
struct address_space;
#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
#define USE_SPLIT_PTLOCKS (NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS)
#if USE_SPLIT_PTLOCKS
typedef atomic_long_t mm_counter_t;
#else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
#else /* !USE_SPLIT_PTLOCKS */
typedef unsigned long mm_counter_t;
#endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
#endif /* !USE_SPLIT_PTLOCKS */
/*
* Each physical page in the system has a struct page associated with
@ -65,7 +67,7 @@ struct page {
* see PAGE_MAPPING_ANON below.
*/
};
#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
#if USE_SPLIT_PTLOCKS
spinlock_t ptl;
#endif
struct kmem_cache *slab; /* SLUB: Pointer to slab */

6
include/linux/sched.h
View File

@ -352,7 +352,7 @@ arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
extern void arch_unmap_area(struct mm_struct *, unsigned long);
extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
#if USE_SPLIT_PTLOCKS
/*
* The mm counters are not protected by its page_table_lock,
* so must be incremented atomically.
@ -363,7 +363,7 @@ extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
#define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
#define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
#else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
#else /* !USE_SPLIT_PTLOCKS */
/*
* The mm counters are protected by its page_table_lock,
* so can be incremented directly.
@ -374,7 +374,7 @@ extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
#define inc_mm_counter(mm, member) (mm)->_##member++
#define dec_mm_counter(mm, member) (mm)->_##member--
#endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
#endif /* !USE_SPLIT_PTLOCKS */
#define get_mm_rss(mm) \
(get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))