lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Tue, 15 Sep 2015 23:55:55 +0300 From: Aaro Koskinen <aaro.koskinen@....fi> To: Eric Curtin <ericcurtin17@...il.com> Cc: valentina.manea.m@...il.com, shuah.kh@...sung.com, linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: tools: usbip: detach: avoid calling strlen() at each iteration Hi, On Tue, Sep 15, 2015 at 09:27:20PM +0100, Eric Curtin wrote: > Instead of calling strlen on every iteration of the for loop, just call it > once and cache the result in a temporary local variable which will be used > in the for loop instead. > > Signed-off-by: Eric Curtin <ericcurtin17@...il.com> > > diff --git a/tools/usb/usbip/src/usbip_detach.c b/tools/usb/usbip/src/usbip_detach.c > index 05c6d15..9db9d21 100644 > --- a/tools/usb/usbip/src/usbip_detach.c > +++ b/tools/usb/usbip/src/usbip_detach.c > @@ -47,7 +47,9 @@ static int detach_port(char *port) > uint8_t portnum; > char path[PATH_MAX+1]; > The above blank line should be deleted if you declare a new local variable below... > - for (unsigned int i = 0; i < strlen(port); i++) > + unsigned int port_len = strlen(port); > + > + for (unsigned int i = 0; i < port_len; i++) port is read only in this function, so maybe just use "const" and the compiler should know to do the same without adding a new variable? A. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists