[PATCH v4 1/5] common/vmap: Fall back to simple allocator when !HAS_VMAP

[Luca Fancellu <luca.fancellu@xxxxxxx>]

When HAS_VMAP is disabled, the xv{malloc,zalloc,...} functions
should fall back to the simple x{malloc,zalloc,...} variant,
implement that because MPU systems won't have virtual memory.

Additionally remove VMAP_VIRT_START from vmap.h guards since
MPU systems won't have it defined.

Signed-off-by: Luca Fancellu <luca.fancellu@xxxxxxx>
---
Changes from v3:
 - use #define-s instead of static inline functions
Changes from v2:
 - Don't protect declarations.
Changes from v1:
 - put back static inline iounmap
 - changed commit message
 - hide not used declaration for system with !HAS_VMAP
 - correct function declared in xvmalloc.h to be static inline
 - prefer '#ifdef' instead of '#if defined' where possible
---
---
 xen/include/xen/vmap.h     |  2 +-
 xen/include/xen/xvmalloc.h | 21 ++++++++++++++++-----
 2 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/xen/include/xen/vmap.h b/xen/include/xen/vmap.h
index c1dd7ac22f30..26c831757a11 100644
--- a/xen/include/xen/vmap.h
+++ b/xen/include/xen/vmap.h
@@ -5,7 +5,7 @@
  * purpose area (VMAP_DEFAULT) and a livepatch-specific area (VMAP_XEN). The
  * latter is used when loading livepatches and the former for everything else.
  */
-#if !defined(__XEN_VMAP_H__) && defined(VMAP_VIRT_START)
+#ifndef __XEN_VMAP_H__
 #define __XEN_VMAP_H__
 
 #include <xen/mm-frame.h>
diff --git a/xen/include/xen/xvmalloc.h b/xen/include/xen/xvmalloc.h
index 440d85a284bb..7686d49f8154 100644
--- a/xen/include/xen/xvmalloc.h
+++ b/xen/include/xen/xvmalloc.h
@@ -40,20 +40,31 @@
     ((typeof(ptr))_xvrealloc(ptr, offsetof(typeof(*(ptr)), field[nr]), \
                              __alignof__(typeof(*(ptr)))))
 
+#ifdef CONFIG_HAS_VMAP
+
 /* Free any of the above. */
 void xvfree(void *va);
 
+/* Underlying functions */
+void *_xvmalloc(size_t size, unsigned int align);
+void *_xvzalloc(size_t size, unsigned int align);
+void *_xvrealloc(void *va, size_t size, unsigned int align);
+
+#else /* !CONFIG_HAS_VMAP */
+
+#define xvfree      xfree
+#define _xvmalloc   _xmalloc
+#define _xvzalloc   _xzalloc
+#define _xvrealloc  _xrealloc
+
+#endif /* CONFIG_HAS_VMAP */
+
 /* Free an allocation, and zero the pointer to it. */
 #define XVFREE(p) do { \
     xvfree(p);         \
     (p) = NULL;        \
 } while ( false )
 
-/* Underlying functions */
-void *_xvmalloc(size_t size, unsigned int align);
-void *_xvzalloc(size_t size, unsigned int align);
-void *_xvrealloc(void *va, size_t size, unsigned int align);
-
 static inline void *_xvmalloc_array(
     size_t size, unsigned int align, unsigned long num)
 {
-- 
2.34.1