From: Dmitry V. Levin <ldv@altlinux.org>
Date: Fri, 18 Feb 2011 23:19:47 +0000 (+0000)
Subject: Optimize known_scno()
X-Git-Tag: v4.6~46
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=bd13645efb3094267ce95920b6941cfcac757036;p=strace

Optimize known_scno()

* syscall.c (known_scno): Do not check for native_scno field on
platforms that support only one personality.
---

diff --git a/syscall.c b/syscall.c
index dc82b2a2..79d3b4a3 100644
--- a/syscall.c
+++ b/syscall.c
@@ -1326,13 +1326,14 @@ get_scno(struct tcb *tcp)
 
 
 long
-known_scno(tcp)
-struct tcb *tcp;
+known_scno(struct tcb *tcp)
 {
 	long scno = tcp->scno;
+#if SUPPORTED_PERSONALITIES > 1
 	if (scno >= 0 && scno < nsyscalls && sysent[scno].native_scno != 0)
 		scno = sysent[scno].native_scno;
 	else
+#endif
 		scno += NR_SYSCALL_BASE;
 	return scno;
 }