SLUB: add some more inlines and #ifdef CONFIG_SLUB_DEBUG

[karo-tx-linux.git] / mm / util.c

diff --git a/mm/util.c b/mm/util.c
index ace2aea69f1a834ca7526a1bfa4070205b82579e..f2f21b7755169b562d5dee3eb64d4d1e61f370c3 100644 (file)
--- a/mm/util.c
+++ b/mm/util.c
@@ -58,6 +58,40 @@ void *kmemdup(const void *src, size_t len, gfp_t gfp)
 }
 EXPORT_SYMBOL(kmemdup);
 
+/**
+ * krealloc - reallocate memory. The contents will remain unchanged.
+ * @p: object to reallocate memory for.
+ * @new_size: how many bytes of memory are required.
+ * @flags: the type of memory to allocate.
+ *
+ * The contents of the object pointed to are preserved up to the
+ * lesser of the new and old sizes.  If @p is %NULL, krealloc()
+ * behaves exactly like kmalloc().  If @size is 0 and @p is not a
+ * %NULL pointer, the object pointed to is freed.
+ */
+void *krealloc(const void *p, size_t new_size, gfp_t flags)
+{
+       void *ret;
+       size_t ks;
+
+       if (unlikely(!new_size)) {
+               kfree(p);
+               return ZERO_SIZE_PTR;
+       }
+
+       ks = ksize(p);
+       if (ks >= new_size)
+               return (void *)p;
+
+       ret = kmalloc_track_caller(new_size, flags);
+       if (ret) {
+               memcpy(ret, p, min(new_size, ks));
+               kfree(p);
+       }
+       return ret;
+}
+EXPORT_SYMBOL(krealloc);
+
 /*
  * strndup_user - duplicate an existing string from user space
  *