From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daniel Stekloff Date: Thu, 15 Jul 2004 14:53:44 +0000 Subject: Re: getpagesize / libsysfs broken with 0.148 Message-Id: <1089903223.1556.14.camel@localhost.localdomain> List-Id: References: <40F6457F.8050200@suse.de> In-Reply-To: <40F6457F.8050200@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-hotplug@vger.kernel.org On Thu, 2004-07-15 at 01:51, Hannes Reinecke wrote: > Hi all, > > the implementation of getpagesize() is broken in klibc. > > klibc uses sysinfo.mem_unit, which linux interpretes as the memory unit > all other memory values returned are to be multiplied with. > So it's perfectly ok for the linux sysinfo() to return a mem_unit of > '1', which is does if the memory available for this machine fits into > the counter. > For the unbelievers, have a look in kernel/timer.c:sys_sysinfo(). > > As a quick hack I've added a check for mem_unit=1 and reset the > page_size to 4096 on those cases. > > Naturally, this is not the right fix. The right fix would be to get the > values from the kernel headers and/or some magic juju for those machines > with variable pagesize. > > It probably would not have been noticed, but as libsysfs insists on > doing all reads from sysfs attributes with a length of pagesize, the > failures were ... interesting. Libsysfs reads with length of pagesize because that was a sysfs limitation. Has sysfs changed? There use to be an ifdef klibc around the getpagesize() call but that seems to have been removed at some point. Thanks, Dan > So in short, udev does _not_ work with klibc until that (or an > equivalent) patch is applied. > > Cheers, > > Hannes ------------------------------------------------------- This SF.Net email is sponsored by BEA Weblogic Workshop FREE Java Enterprise J2EE developer tools! Get your free copy of BEA WebLogic Workshop 8.1 today. http://ads.osdn.com/?ad_idG21&alloc_id040&op=click _______________________________________________ Linux-hotplug-devel mailing list http://linux-hotplug.sourceforge.net Linux-hotplug-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-hotplug-devel