linux-kernel - Query : siginitsetinv/siginitset has a memset of size 0

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Date:	Thu, 21 Jul 2016 20:42:13 +0530
From:	pavi1729 <pavitra1729@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Query : siginitsetinv/siginitset has a memset of size 0

Hi,
  signal.h code and a memset of size 0, is that fine or am I missing something ?


http://lxr.free-electrons.com/source/include/linux/signal.h

200 static inline void siginitsetinv(sigset_t *set, unsigned long mask)
201 {
202         set->sig[0] = ~mask;
203         switch (_NSIG_WORDS) {
204         default:
205                 memset(&set->sig[1], -1,
sizeof(long)*(_NSIG_WORDS-1));  <-- size 0
206                 break;
207         case 2: set->sig[1] = -1;
208         case 1: ;
209         }
210 }


http://lxr.free-electrons.com/source/arch/ia64/include/asm/signal.h#L16
 14 #define _NSIG           64
 15 #define _NSIG_BPW       64
 16 #define _NSIG_WORDS     (_NSIG / _NSIG_BPW)
 17


Thanks,
Pavi