Merge patch series "integer limit macro consolidation"

Rasmus Villemoes <[email protected]> says:

I was bitten by our limit macros not being usable in #if conditionals
when building a standalone app. It turns out that the work to fix that
had already been started by the inclusion of the mbedtls library, so
it's something that people do hit.

Let's finish the job by providing suitable limit macros for all three families:

- Standard C types, char, short, ...
- Kernel-style fixed-width types s8, u64, ...
- POSIX/C99 fixed-width types int16_t, uint32_t, ...

Please note that a naive approach like spelling out the full decimal
value for the constants doesn't really work, as there is no such thing
as a "negative integer constant". That is, doing

#define LLONG_MIN -9223372036854775808LL

would lead to the compiler complaining

  warning: integer constant is so large that it is unsigned

and the type of that LLONG_MIN would actually be "unsigned long long", so e.g.

#if LLONG_MIN >= 0
#warning "LLONG_MIN is not negative?"
#endif

would fire.

Link: https://lore.kernel.org/r/[email protected]

1 files changed, 0 insertions, 26 deletions

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 9467edd65ab..e0443ecac84 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -5,32 +5,6 @@
 #include <linux/printk.h> /* for printf/pr_* utilities */
 #include <limits.h>
 
-#define USHRT_MAX	((u16)(~0U))
-#define SHRT_MAX	((s16)(USHRT_MAX>>1))
-#define SHRT_MIN	((s16)(-SHRT_MAX - 1))
-#define INT_MIN		(-INT_MAX - 1)
-#define LONG_MAX	((long)(~0UL>>1))
-#define LONG_MIN	(-LONG_MAX - 1)
-#define ULONG_MAX	(~0UL)
-#define LLONG_MAX	((long long)(~0ULL>>1))
-#define LLONG_MIN	(-LLONG_MAX - 1)
-#define ULLONG_MAX	(~0ULL)
-
-#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 INT32_MAX	S32_MAX
-
 #define STACK_MAGIC	0xdeadbeef
 
 #define REPEAT_BYTE(x)	((~0ul / 0xff) * (x))