The patch titled
mm: fix fixup_user_fault() for MMU=n
has been added to the -mm tree. Its filename is
mm-fix-fixup_user_fault-for-mmu=n.patch
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------------------------------------------------------
Subject: mm: fix fixup_user_fault() for MMU=n
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
In commit 2efaca927 ("mm/futex: fix futex writes on archs with SW tracking
of dirty & young") we forgot about MMU=n. This patch fixes that.
Acked-by: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Acked-by: David Howells <dhowells@xxxxxxxxxx>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/mm.h | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff -puN include/linux/mm.h~mm-fix-fixup_user_fault-for-mmu=n include/linux/mm.h
--- a/include/linux/mm.h~mm-fix-fixup_user_fault-for-mmu=n
+++ a/include/linux/mm.h
@@ -962,6 +962,8 @@ int invalidate_inode_page(struct page *p
#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
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 *t
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);
_
Patches currently in -mm which might be from peterz@xxxxxxxxxxxxx are
origin.patch
mm-fix-fixup_user_fault-for-mmu=n.patch
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