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kernel.h: define u8, s8, u32, etc. limits

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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>
This commit is contained in:
Alex Elder 2014-01-23 15:54:00 -08:00 committed by Linus Torvalds
parent 77719536dc
commit 89a0714106
1 changed files with 13 additions and 0 deletions
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13
include/linux/kernel.h
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@ -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))