[PATCH v2 16/16] malloc: add PBL stubs

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

To optimize out calls to undefined functions in PBL at compile-time
instead of link time, let's define stubs for the functions that
are referenced in obj-pbl-y files, but inside function sections
that are ultimately unreferenced.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 include/linux/string.h |  7 +++++++
 include/malloc.h       | 37 +++++++++++++++++++++++++++++++++++++
 2 files changed, 44 insertions(+)

diff --git a/include/linux/string.h b/include/linux/string.h
index 3b8775c9a57d..5d5824b61bf0 100644
--- a/include/linux/string.h
+++ b/include/linux/string.h
@@ -161,7 +161,14 @@ static inline const char *kbasename(const char *path)
 }
 #endif
 
+#if IN_PROPER
 void *memdup(const void *, size_t);
+#else
+static inline void *memdup(const void *buf, size_t size)
+{
+	return NULL;
+}
+#endif
 
 #define memdup_array(arr, count) memdup(arr, array_size(count, sizeof(*arr)));
 
diff --git a/include/malloc.h b/include/malloc.h
index fc0c94855e05..a823ce8c8462 100644
--- a/include/malloc.h
+++ b/include/malloc.h
@@ -5,6 +5,7 @@
 #include <linux/compiler.h>
 #include <types.h>
 
+#if IN_PROPER
 void *malloc(size_t) __alloc_size(1);
 size_t malloc_usable_size(void *);
 void free(void *);
@@ -16,5 +17,41 @@ void malloc_stats(void);
 void *sbrk(ptrdiff_t increment);
 
 int mem_malloc_is_initialized(void);
+#else
+static inline void *malloc(size_t nbytes)
+{
+	return NULL;
+}
+static inline void free(void *buf)
+{
+}
+static inline void free_sensitive(void *buf)
+{
+}
+static inline void *realloc(void *orig, size_t nbytes)
+{
+	return NULL;
+}
+static inline void *memalign(size_t align, size_t size)
+{
+	return NULL;
+}
+static inline void *calloc(size_t num, size_t size)
+{
+	return NULL;
+}
+static inline void malloc_stats(void)
+{
+}
+static inline void *sbrk(ptrdiff_t increment)
+{
+	return NULL;
+}
+
+static inline int mem_malloc_is_initialized(void)
+{
+	return 0;
+}
+#endif
 
 #endif /* __MALLOC_H */
-- 
2.39.5