diff options
| author | Rasmus Villemoes <ravi@prevas.dk> | 2025-07-07 22:36:53 +0200 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2025-07-14 12:43:28 -0600 |
| commit | dc323f3bee318514af9d7c6fed1e01c712bc71ae (patch) | |
| tree | 2f552b86cd2e9a650ea33ebed0ce32cecbbdd78f /include/linux/kernel.h | |
| parent | e37de002fac3895e8d0b60ae2015e17bb33e2b5b (diff) | |
move more limits from kernel.h to limits.h and standardize their definitions
In a customer project that was building a stand-alone application, I
hit a problem related to the fact that our LONG_MAX and friends are
not standards-compliant, in that they are not "suitable for use in #if
preprocessing directives"
... /toolchain_none/arm-cortexa8-eabi/sys-include/machine/_default_types.h:25:31: error: missing binary operator before token "long"
25 | || ( defined(LLONG_MAX) && (LLONG_MAX > 0x7fffffff) )
| ^~~~~~~~~
So following up on commit 13de8483388 ("mbedtls: add mbedtls into the
build system"), move the rest of the macros associated to the standard
C types {signed,unsigned} {char, short, int, long, long long} (and of
course bare 'char') to limits.h.
Make use of the fact that both gcc and clang provide suitable
predefined __FOO_MAX__ macros for the signed types, and use a standard
scheme for defining the FOO_MIN and UFOO_MAX macros in terms of
FOO_MAX.
Note that suffixes like L and ULL are allowed for preprocessor
integers; it is (casts) which are not. And using appropriate suffixes,
we can arrange for the type of e.g. UINT_MAX to be "unsigned int" due
to integer promotion rules.
Signed-off-by: Rasmus Villemoes <ravi@prevas.dk>
Diffstat (limited to 'include/linux/kernel.h')
| -rw-r--r-- | include/linux/kernel.h | 11 |
1 files changed, 0 insertions, 11 deletions
diff --git a/include/linux/kernel.h b/include/linux/kernel.h index 9467edd65ab..f26274fbe1d 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -5,17 +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)) |