From mboxrd@z Thu Jan 1 00:00:00 1970 From: "H. Peter Anvin" Date: Thu, 15 Jul 2004 15:57:36 +0000 Subject: Re: [klibc] getpagesize / libsysfs broken with 0.148 Message-Id: <40F6A970.6010008@zytor.com> 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 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. > *SIGH* So much for the claim that there actually existed a sane way to get the page size across platforms. This is particularly nasty because of the definition of mmap2(). The kernel headers don't work very well since page size is a kernel-compile-time option on some platforms, e.g. MIPS, and dynamic on some platforms. -hpa ------------------------------------------------------- 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