common.h: Introduce DEFINE_CACHE_ALIGN_BUFFER
This is the out-of-function-scope counterpart of
ALLOC_CACHE_ALIGN_BUFFER.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Tom Rini <trini@ti.com>
[ilya.yanok]: added missing <linux/compiler.h> include and
{DEFINE,ALLOC}_ALIGN_BUFFER macros allowing explicit alignment
specification.
Signed-off-by: Ilya Yanok <ilya.yanok@cogentembedded.com>
diff --git a/include/common.h b/include/common.h
index d1dd65a..be9c278 100644
--- a/include/common.h
+++ b/include/common.h
@@ -39,6 +39,7 @@
#include <linux/bitops.h>
#include <linux/types.h>
#include <linux/string.h>
+#include <linux/compiler.h>
#include <asm/ptrace.h>
#include <stdarg.h>
#if defined(CONFIG_PCI) && (defined(CONFIG_4xx) && !defined(CONFIG_AP1000))
@@ -944,11 +945,25 @@
* of a function scoped static buffer. It can not be used to create a cache
* line aligned global buffer.
*/
+#define ALLOC_ALIGN_BUFFER(type, name, size, align) \
+ char __##name[ROUND(size * sizeof(type), align) + (align - 1)]; \
+ \
+ type *name = (type *) ALIGN((uintptr_t)__##name, align)
#define ALLOC_CACHE_ALIGN_BUFFER(type, name, size) \
- char __##name[ROUND(size * sizeof(type), ARCH_DMA_MINALIGN) + \
- ARCH_DMA_MINALIGN - 1]; \
+ ALLOC_ALIGN_BUFFER(type, name, size, ARCH_DMA_MINALIGN)
+
+/*
+ * DEFINE_CACHE_ALIGN_BUFFER() is similar to ALLOC_CACHE_ALIGN_BUFFER, but it's
+ * purpose is to allow allocating aligned buffers outside of function scope.
+ * Usage of this macro shall be avoided or used with extreme care!
+ */
+#define DEFINE_ALIGN_BUFFER(type, name, size, align) \
+ static char __##name[roundup(size * sizeof(type), align)] \
+ __aligned(align); \
\
- type *name = (type *) ALIGN((uintptr_t)__##name, ARCH_DMA_MINALIGN)
+ static type *name = (type *)__##name
+#define DEFINE_CACHE_ALIGN_BUFFER(type, name, size) \
+ DEFINE_ALIGN_BUFFER(type, name, size, ARCH_DMA_MINALIGN)
/* Pull in stuff for the build system */
#ifdef DO_DEPS_ONLY