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| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-03-12 11:40:15 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-03-12 11:40:15 -0700 |
| commit | 192c028b6ac972df25fd624f94a94d038fbdb66c (patch) | |
| tree | 4dd9d13ffd239e4d7c61401f892989742c671fa8 /include/linux/mm.h | |
| parent | ea1990c3796e7550e6f240983f2d1b8e5ecf3891 (diff) | |
| parent | fa389e220254c69ffae0d403eac4146171062d08 (diff) | |
Merge 3.14-rc6 into usb-next
We want the USB fixes in here as well.
Diffstat (limited to 'include/linux/mm.h')
| -rw-r--r-- | include/linux/mm.h | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index f28f46eade6..c1b7414c7be 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -175,7 +175,7 @@ extern unsigned int kobjsize(const void *objp); * Special vmas that are non-mergable, non-mlock()able. * Note: mm/huge_memory.c VM_NO_THP depends on this definition. */ -#define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP) +#define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP | VM_MIXEDMAP) /* * mapping from the currently active vm_flags protection bits (the @@ -399,8 +399,18 @@ static inline void compound_unlock_irqrestore(struct page *page, static inline struct page *compound_head(struct page *page) { - if (unlikely(PageTail(page))) - return page->first_page; + if (unlikely(PageTail(page))) { + struct page *head = page->first_page; + + /* + * page->first_page may be a dangling pointer to an old + * compound page, so recheck that it is still a tail + * page before returning. + */ + smp_rmb(); + if (likely(PageTail(page))) + return head; + } return page; } @@ -757,7 +767,7 @@ static inline bool __cpupid_match_pid(pid_t task_pid, int cpupid) #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS static inline int page_cpupid_xchg_last(struct page *page, int cpupid) { - return xchg(&page->_last_cpupid, cpupid); + return xchg(&page->_last_cpupid, cpupid & LAST_CPUPID_MASK); } static inline int page_cpupid_last(struct page *page) @@ -766,7 +776,7 @@ static inline int page_cpupid_last(struct page *page) } static inline void page_cpupid_reset_last(struct page *page) { - page->_last_cpupid = -1; + page->_last_cpupid = -1 & LAST_CPUPID_MASK; } #else static inline int page_cpupid_last(struct page *page) |