[PATCH mm-unstable v7 06/31] mm: Convert ptlock_ptr() to use ptdescs

[Vishal Moola (Oracle)]

This removes some direct accesses to struct page, working towards
splitting out struct ptdesc from struct page.

Signed-off-by: Vishal Moola (Oracle) <vishal.mo...@gmail.com>
Acked-by: Mike Rapoport (IBM) <r...@kernel.org>
---
 arch/x86/xen/mmu_pv.c |  2 +-
 include/linux/mm.h    | 14 +++++++-------
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/arch/x86/xen/mmu_pv.c b/arch/x86/xen/mmu_pv.c
index e0a975165de7..8796ec310483 100644
--- a/arch/x86/xen/mmu_pv.c
+++ b/arch/x86/xen/mmu_pv.c
@@ -667,7 +667,7 @@ static spinlock_t *xen_pte_lock(struct page *page, struct 
mm_struct *mm)
        spinlock_t *ptl = NULL;
 
 #if USE_SPLIT_PTE_PTLOCKS
-       ptl = ptlock_ptr(page);
+       ptl = ptlock_ptr(page_ptdesc(page));
        spin_lock_nest_lock(ptl, &mm->page_table_lock);
 #endif
 
diff --git a/include/linux/mm.h b/include/linux/mm.h
index b3fce0bfe201..c155f82dd2cc 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2844,9 +2844,9 @@ void __init ptlock_cache_init(void);
 bool ptlock_alloc(struct ptdesc *ptdesc);
 extern void ptlock_free(struct page *page);
 
-static inline spinlock_t *ptlock_ptr(struct page *page)
+static inline spinlock_t *ptlock_ptr(struct ptdesc *ptdesc)
 {
-       return page->ptl;
+       return ptdesc->ptl;
 }
 #else /* ALLOC_SPLIT_PTLOCKS */
 static inline void ptlock_cache_init(void)
@@ -2862,15 +2862,15 @@ static inline void ptlock_free(struct page *page)
 {
 }
 
-static inline spinlock_t *ptlock_ptr(struct page *page)
+static inline spinlock_t *ptlock_ptr(struct ptdesc *ptdesc)
 {
-       return &page->ptl;
+       return &ptdesc->ptl;
 }
 #endif /* ALLOC_SPLIT_PTLOCKS */
 
 static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd)
 {
-       return ptlock_ptr(pmd_page(*pmd));
+       return ptlock_ptr(page_ptdesc(pmd_page(*pmd)));
 }
 
 static inline bool ptlock_init(struct page *page)
@@ -2885,7 +2885,7 @@ static inline bool ptlock_init(struct page *page)
        VM_BUG_ON_PAGE(*(unsigned long *)&page->ptl, page);
        if (!ptlock_alloc(page_ptdesc(page)))
                return false;
-       spin_lock_init(ptlock_ptr(page));
+       spin_lock_init(ptlock_ptr(page_ptdesc(page)));
        return true;
 }
 
@@ -2971,7 +2971,7 @@ static inline struct ptdesc *pmd_ptdesc(pmd_t *pmd)
 
 static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd)
 {
-       return ptlock_ptr(ptdesc_page(pmd_ptdesc(pmd)));
+       return ptlock_ptr(pmd_ptdesc(pmd));
 }
 
 static inline bool pmd_ptlock_init(struct page *page)
-- 
2.40.1