mm: vmalloc fix lazy unmapping cache aliasing

[linux-2.6-omap-h63xx.git] / mm / vmalloc.c

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 30f826d484f0b935af18a793f7fe49b65903025e..f3f6e0758562283ac51fc4267a4d87fed600e917 100644 (file)
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -77,7 +77,6 @@ static void vunmap_page_range(unsigned long addr, unsigned long end)
 
        BUG_ON(addr >= end);
        pgd = pgd_offset_k(addr);
-       flush_cache_vunmap(addr, end);
        do {
                next = pgd_addr_end(addr, end);
                if (pgd_none_or_clear_bad(pgd))
@@ -543,9 +542,10 @@ static void purge_vmap_area_lazy(void)
 }
 
 /*
- * Free and unmap a vmap area
+ * Free and unmap a vmap area, caller ensuring flush_cache_vunmap had been
+ * called for the correct range previously.
  */
-static void free_unmap_vmap_area(struct vmap_area *va)
+static void free_unmap_vmap_area_noflush(struct vmap_area *va)
 {
        va->flags |= VM_LAZY_FREE;
        atomic_add((va->va_end - va->va_start) >> PAGE_SHIFT, &vmap_lazy_nr);
@@ -553,6 +553,15 @@ static void free_unmap_vmap_area(struct vmap_area *va)
                try_purge_vmap_area_lazy();
 }
 
+/*
+ * Free and unmap a vmap area
+ */
+static void free_unmap_vmap_area(struct vmap_area *va)
+{
+       flush_cache_vunmap(va->va_start, va->va_end);
+       free_unmap_vmap_area_noflush(va);
+}
+
 static struct vmap_area *find_vmap_area(unsigned long addr)
 {
        struct vmap_area *va;
@@ -734,7 +743,7 @@ static void free_vmap_block(struct vmap_block *vb)
        spin_unlock(&vmap_block_tree_lock);
        BUG_ON(tmp != vb);
 
-       free_unmap_vmap_area(vb->va);
+       free_unmap_vmap_area_noflush(vb->va);
        call_rcu(&vb->rcu_head, rcu_free_vb);
 }
 
@@ -796,6 +805,9 @@ static void vb_free(const void *addr, unsigned long size)
 
        BUG_ON(size & ~PAGE_MASK);
        BUG_ON(size > PAGE_SIZE*VMAP_MAX_ALLOC);
+
+       flush_cache_vunmap((unsigned long)addr, (unsigned long)addr + size);
+
        order = get_order(size);
 
        offset = (unsigned long)addr & (VMAP_BLOCK_SIZE - 1);