[PATCH] lockdep: annotate mm

Teach special (recursive) locking code to the lock validator.  Has no effect
on non-lockdep kernels.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/mm/memory.c b/mm/memory.c
index 7e2a4b1..c1e14c9 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -503,7 +503,7 @@ again:
                return -ENOMEM;
        src_pte = pte_offset_map_nested(src_pmd, addr);
        src_ptl = pte_lockptr(src_mm, src_pmd);
-       spin_lock(src_ptl);
+       spin_lock_nested(src_ptl, SINGLE_DEPTH_NESTING);
 
        do {
                /*

diff --git a/mm/mremap.c b/mm/mremap.c
index 1903bdf..7c15cf3 100644 (file)
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -97,7 +97,7 @@ static void move_ptes(struct vm_area_struct *vma, pmd_t *old_pmd,
        new_pte = pte_offset_map_nested(new_pmd, new_addr);
        new_ptl = pte_lockptr(mm, new_pmd);
        if (new_ptl != old_ptl)
-               spin_lock(new_ptl);
+               spin_lock_nested(new_ptl, SINGLE_DEPTH_NESTING);
 
        for (; old_addr < old_end; old_pte++, old_addr += PAGE_SIZE,
                                   new_pte++, new_addr += PAGE_SIZE) {