slob: fix free block merging at head of subpage

[linux-block.git] / mm / slob.c

diff --git a/mm/slob.c b/mm/slob.c
index 08a9bd91a1aaf517f1b17ff688fa9f612273f873..c56c5e57c19261b7ae26ff6468674cd618b8381b 100644 (file)
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -330,7 +330,7 @@ static void *slob_alloc(size_t size, gfp_t gfp, int align, int node)
 
        /* Not enough space: must allocate a new page */
        if (!b) {
-               b = slob_new_page(gfp, 0, node);
+               b = slob_new_page(gfp & ~__GFP_ZERO, 0, node);
                if (!b)
                        return 0;
                sp = (struct slob_page *)virt_to_page(b);
@@ -398,6 +398,10 @@ static void slob_free(void *block, int size)
        sp->units += units;
 
        if (b < sp->free) {
+               if (b + units == sp->free) {
+                       units += slob_units(sp->free);
+                       sp->free = slob_next(sp->free);
+               }
                set_slob(b, units, sp->free);
                sp->free = b;
        } else {
@@ -495,6 +499,7 @@ size_t ksize(const void *block)
        else
                return sp->page.private;
 }
+EXPORT_SYMBOL(ksize);
 
 struct kmem_cache {
        unsigned int size, align;