Messages in this thread | | | Subject | Re: [PATCH] LinuxPPS (with new syscalls API) | From | David Woodhouse <> | Date | Wed, 27 Jun 2007 11:18:30 +0100 |
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On Wed, 2007-06-27 at 12:14 +0200, Rodolfo Giometti wrote: > On Tue, Jun 26, 2007 at 06:38:40PM +0100, David Woodhouse wrote: > > > > 64-bit kernels can run 32-bit userspace programs. But some structures > > come out _differently_ between 32-bit and 64-bit compilation, so the > > system call needs a special 'compat' handler instead of just running the > > normal 64-bit system call. > > > > The 'struct timespec' is one structure which is sometimes different for > > 32-bit vs. 64-bit, so any system call taking a 'struct timespec' must > > have a separate compat_sys_xxxx() to handle that. See something like > > compat_sys_clock_settime() in kernel/compat.c for an example (but don't > > use set_fs() like it does; just see how it handles the compat_timespec). > > Did you mean something like this?
How will 64-bit system calls work if you do it like that? You need to provide _both_ sys_time_pps_fetch() and compat_sys_time_pps_fetch().
-- dwmw2
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