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[03/15] batman-adv: add biggest_unsigned_int(x) macro

Message ID 1335689867-8017-4-git-send-email-ordex@autistici.org
State Changes Requested, archived
Delegated to: David Miller
Headers show

Commit Message

Antonio Quartulli April 29, 2012, 8:57 a.m. UTC 
in case of dynamic type variable, it could be needed to compute at compile time
its maximal value. This macro helps in doing that for unsigned integer types

Signed-off-by: Antonio Quartulli <ordex@autistici.org>
---
 net/batman-adv/main.h |    3 +++
 1 file changed, 3 insertions(+)
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Patch

diff --git a/net/batman-adv/main.h b/net/batman-adv/main.h
index a2b18d0..d9ef4ca 100644
--- a/net/batman-adv/main.h
+++ b/net/batman-adv/main.h
@@ -221,6 +221,9 @@  static inline bool has_timed_out(unsigned long timestamp, unsigned int timeout)
 /* Returns the smallest signed integer in two's complement with the sizeof x */
 #define smallest_signed_int(x) (1u << (7u + 8u * (sizeof(x) - 1u)))
 
+/* Returns the biggest unsigned integer with the sizeof x */
+#define biggest_unsigned_int(x) (~(x)0)
+
 /* Checks if a sequence number x is a predecessor/successor of y.
  * they handle overflows/underflows and can correctly check for a
  * predecessor/successor unless the variable sequence number has grown by