# HG changeset patch
# User Jan Beulich <jbeulich@xxxxxxxx>
# Date 1317730526 -7200
# Node ID e09ebf7a31f55bb26c3cce7695a435ed20adf05b
# Parent a99d75671a911f9c0d5d11e0fe88a0a65863cb44
introduce xzalloc() & Co
Rather than having to match a call to one of the xmalloc() flavors with
a subsequent memset(), introduce a zeroing variant of each of those
flavors.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Keir Fraser <keir@xxxxxxx>
---
diff -r a99d75671a91 -r e09ebf7a31f5 xen/common/xmalloc_tlsf.c
--- a/xen/common/xmalloc_tlsf.c Tue Oct 04 14:11:56 2011 +0200
+++ b/xen/common/xmalloc_tlsf.c Tue Oct 04 14:15:26 2011 +0200
@@ -585,6 +585,13 @@
return p;
}
+void *_xzalloc(unsigned long size, unsigned long align)
+{
+ void *p = _xmalloc(size, align);
+
+ return p ? memset(p, 0, size) : p;
+}
+
void xfree(void *p)
{
struct bhdr *b;
diff -r a99d75671a91 -r e09ebf7a31f5 xen/include/acpi/platform/aclinux.h
--- a/xen/include/acpi/platform/aclinux.h Tue Oct 04 14:11:56 2011 +0200
+++ b/xen/include/acpi/platform/aclinux.h Tue Oct 04 14:15:26 2011 +0200
@@ -77,10 +77,7 @@
#define acpi_thread_id struct vcpu *
#define ACPI_ALLOCATE(a) xmalloc_bytes(a)
-#define ACPI_ALLOCATE_ZEROED(a) ({ \
- void *p = xmalloc_bytes(a); \
- if ( p ) memset(p, 0, a); \
- p; })
+#define ACPI_ALLOCATE_ZEROED(a) xzalloc_bytes(a)
#define ACPI_FREE(a) xfree(a)
#endif /* __ACLINUX_H__ */
diff -r a99d75671a91 -r e09ebf7a31f5 xen/include/xen/xmalloc.h
--- a/xen/include/xen/xmalloc.h Tue Oct 04 14:11:56 2011 +0200
+++ b/xen/include/xen/xmalloc.h Tue Oct 04 14:15:26 2011 +0200
@@ -11,19 +11,25 @@
/* Allocate space for typed object. */
#define xmalloc(_type) ((_type *)_xmalloc(sizeof(_type), __alignof__(_type)))
+#define xzalloc(_type) ((_type *)_xzalloc(sizeof(_type), __alignof__(_type)))
/* Allocate space for array of typed objects. */
#define xmalloc_array(_type, _num) \
((_type *)_xmalloc_array(sizeof(_type), __alignof__(_type), _num))
+#define xzalloc_array(_type, _num) \
+ ((_type *)_xzalloc_array(sizeof(_type), __alignof__(_type), _num))
/* Allocate untyped storage. */
-#define xmalloc_bytes(_bytes) (_xmalloc(_bytes, SMP_CACHE_BYTES))
+#define xmalloc_bytes(_bytes) _xmalloc(_bytes, SMP_CACHE_BYTES)
+#define xzalloc_bytes(_bytes) _xzalloc(_bytes, SMP_CACHE_BYTES)
/* Free any of the above. */
extern void xfree(void *);
/* Underlying functions */
extern void *_xmalloc(unsigned long size, unsigned long align);
+extern void *_xzalloc(unsigned long size, unsigned long align);
+
static inline void *_xmalloc_array(
unsigned long size, unsigned long align, unsigned long num)
{
@@ -33,6 +39,15 @@
return _xmalloc(size * num, align);
}
+static inline void *_xzalloc_array(
+ unsigned long size, unsigned long align, unsigned long num)
+{
+ /* Check for overflow. */
+ if (size && num > UINT_MAX / size)
+ return NULL;
+ return _xzalloc(size * num, align);
+}
+
/*
* Pooled allocator interface.
*/
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