[U-Boot] [PATCH v3 03/23] Add abs() macro to return absolute value

[Simon Glass]

This macro is generally useful to make it available in common.

Signed-off-by: Simon Glass <sjg at chromium.org>
---
Changes in v3:
- Add new patch to put abs() in common.h

 include/common.h |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/include/common.h b/include/common.h
index 74d9704..92eac2c 100644
--- a/include/common.h
+++ b/include/common.h
@@ -229,6 +229,19 @@ ulong timer_get_boot_us(void);
 #define MIN(x, y)  min(x, y)
 #define MAX(x, y)  max(x, y)
 
+/*
+ * Return the absolute value of a number. This handles unsigned ints, shorts
+ * and chars and returns a signed long.
+ */
+#define abs(x) ({					\
+		long ret;				\
+		{					\
+			typeof((x)) __x = (x);		\
+			ret = (__x < 0) ? -__x : __x;	\
+		}					\
+		ret;					\
+	})
+
 #if defined(CONFIG_ENV_IS_EMBEDDED)
 #define TOTAL_MALLOC_LEN	CONFIG_SYS_MALLOC_LEN
 #elif ( ((CONFIG_ENV_ADDR+CONFIG_ENV_SIZE) < CONFIG_SYS_MONITOR_BASE) || \
-- 
1.7.7.3