[added,to,the,3.12,stable,tree] kernel.h: define u8, s8, u32, etc. limits

Message ID 1429773689-26866-11-git-send-email-jslaby@suse.cz
State New
Headers show

Commit Message

Jiri Slaby April 23, 2015, 7:20 a.m.
From: Alex Elder <alex.elder@linaro.org>

This patch has been added to the 3.12 stable tree. If you have any
objections, please let us know.

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commit 89a0714106aac7309c7dfa0f004b39e1e89d2942 upstream.

Create constants that define the maximum and minimum values
representable by the kernel types u8, s8, u16, s16, and so on.

Signed-off-by: Alex Elder <elder@linaro.org>
Cc: Sage Weil <sage@inktank.com>
Cc: David Miller <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
 include/linux/kernel.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 672ddc4de4af..93bfc3a7e0a3 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -29,6 +29,19 @@ 
 #define ULLONG_MAX	(~0ULL)
 #define SIZE_MAX	(~(size_t)0)
+#define U8_MAX		((u8)~0U)
+#define S8_MAX		((s8)(U8_MAX>>1))
+#define S8_MIN		((s8)(-S8_MAX - 1))
+#define U16_MAX		((u16)~0U)
+#define S16_MAX		((s16)(U16_MAX>>1))
+#define S16_MIN		((s16)(-S16_MAX - 1))
+#define U32_MAX		((u32)~0U)
+#define S32_MAX		((s32)(U32_MAX>>1))
+#define S32_MIN		((s32)(-S32_MAX - 1))
+#define U64_MAX		((u64)~0ULL)
+#define S64_MAX		((s64)(U64_MAX>>1))
+#define S64_MIN		((s64)(-S64_MAX - 1))
 #define STACK_MAGIC	0xdeadbeef
 #define REPEAT_BYTE(x)	((~0ul / 0xff) * (x))