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

[~andy/linux] / include / linux / kernel.h

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index ecb87544cc5d888be056d903a2e0b227dd24c461..f74bb581ab649cbbec6f1c2abfcb5b4394f0aa85 100644 (file)
--- 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))
@@ -394,6 +407,15 @@ extern int panic_on_oops;
 extern int panic_on_unrecovered_nmi;
 extern int panic_on_io_nmi;
 extern int sysctl_panic_on_stackoverflow;
+/*
+ * Only to be used by arch init code. If the user over-wrote the default
+ * CONFIG_PANIC_TIMEOUT, honor it.
+ */
+static inline void set_arch_panic_timeout(int timeout, int arch_default_timeout)
+{
+       if (panic_timeout == arch_default_timeout)
+               panic_timeout = timeout;
+}
 extern const char *print_tainted(void);
 enum lockdep_ok {
        LOCKDEP_STILL_OK,