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mm: Fix fixup_user_fault() for MMU=n 

In commit 2efaca927f ("mm/futex: fix futex writes on archs with SW
tracking of dirty & young") we forgot about MMU=n.  This patch fixes
that.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: David Howells <dhowells@redhat.com>
Link: http://lkml.kernel.org/r/1311761831.24752.413.camel@twins
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Peter Zijlstra 2011-07-27 12:17:11 +02:00 committed by Linus Torvalds
parent 2f84dd7091
commit 5c723ba5b7
1 changed files with 10 additions and 2 deletions
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12
include/linux/mm.h
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@ -962,6 +962,8 @@ int invalidate_inode_page(struct page *page);
#ifdef CONFIG_MMU
extern int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long address, unsigned int flags);
extern int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
unsigned long address, unsigned int fault_flags);
#else
static inline int handle_mm_fault(struct mm_struct *mm,
struct vm_area_struct *vma, unsigned long address,
@ -971,6 +973,14 @@ static inline int handle_mm_fault(struct mm_struct *mm,
BUG();
return VM_FAULT_SIGBUS;
}
static inline int fixup_user_fault(struct task_struct *tsk,
struct mm_struct *mm, unsigned long address,
unsigned int fault_flags)
{
/* should never happen if there's no MMU */
BUG();
return -EFAULT;
}
#endif
extern int make_pages_present(unsigned long addr, unsigned long end);
@ -988,8 +998,6 @@ int get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
int get_user_pages_fast(unsigned long start, int nr_pages, int write,
struct page **pages);
struct page *get_dump_page(unsigned long addr);
extern int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
unsigned long address, unsigned int fault_flags);
extern int try_to_release_page(struct page * page, gfp_t gfp_mask);
extern void do_invalidatepage(struct page *page, unsigned long offset);