From mboxrd@z Thu Jan 1 00:00:00 1970 From: "H.J. Lu" Subject: Re: new architectures, time_t __kernel_long_t Date: Thu, 15 Nov 2012 06:42:16 -0800 Message-ID: References: <201211141218.02105.arnd@arndb.de> <201211150914.22835.arnd@arndb.de> <201211151436.23088.arnd@arndb.de> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Return-path: Received: from mail-da0-f46.google.com ([209.85.210.46]:58113 "EHLO mail-da0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2993440Ab2KOOmQ (ORCPT ); Thu, 15 Nov 2012 09:42:16 -0500 In-Reply-To: <201211151436.23088.arnd@arndb.de> Sender: linux-arch-owner@vger.kernel.org List-ID: To: Arnd Bergmann Cc: "H. Peter Anvin" , linux-arch@vger.kernel.org, Vineet.Gupta1@synopsys.com, linux-kernel@vger.kernel.org, James Hogan On Thu, Nov 15, 2012 at 6:36 AM, Arnd Bergmann wrote: > On Thursday 15 November 2012, H.J. Lu wrote: >> On Thu, Nov 15, 2012 at 1:14 AM, Arnd Bergmann wrote: >> > On Wednesday 14 November 2012, H. Peter Anvin wrote: >> >> On 11/14/2012 04:18 AM, Arnd Bergmann wrote: >> >> > Since we are in the review phase for two new architectures that we >> >> > should be merging into the mainline kernel, I think we need to >> >> > come up with a solution for making them use a proper 64-bit time_t. >> >> > >> >> > Right now, the only 32-bit user space interface we have to use 64-bit >> >> > time_t is the x32 side of x86-64, and that works by overriding all >> >> > "long" sized types to be 64 bit at the ABI level, which we don't >> >> > want for pure 32 bit architectures. >> >> >> >> Sort of. Either way, the kernel headers aren't really x32-clean yet, so >> >> we have an opportunity to do things more cleanly as we are implementing >> >> this. >> > >> > Ah, I didn't know that. How does one build an x32 libc then? >> >> Glibc has been providing its own types for years. >> Kernel provided types used to be wrong for ia32 >> on x86-64. > > What about ioctls and other calls then that actually do rely on the > kernel headers and use the __kernel_*_t types? > Glibc defines __syscall_slong_t and __syscall_ulong_t. -- H.J.