Re: [PATCH 00/14] tracing: add compat syscall support v3

[Ian Munsie <imunsie@au1.ibm.com>]

Excerpts from Jason Baron's message of Fri May 21 23:24:07 +1000 2010:
> On Fri, May 21, 2010 at 07:40:21PM +1000, Ian Munsie wrote:
> > Hi Jason,
> > 
> > I'm currently in the process of implementing syscall tracepoints for
> > PowerPC, and a considerable amount of my work is going to end up
> > requiring these patches of yours. I've reviewed and tested your patches
> > (and spent a good chunk of time rebasing them on top of
> > tip/tracing/core) and they all seem pretty good.
> > 
> > I *particularly* like the way in which they prevent ftrace syscalls from
> > reporting that sys_swapoff was constantly firing on x86_64 kernels with
> > a 32bit userspace ;)
> > 
> > Anyway, I'm just wondering if you have an ETA for the v4 patchset to
> > address the remaining issues that Frederic raised so that they can be
> > merged.
> > 
> > Cheers,
> > -Ian
> > 
> 
> hi Ian,
> 
> I think the main issue left was that I am using the same meta data for
> both the 32-bit and 64-bit table entries, when they reference the same
> syscall. for example, for x86 both the compat and underlying 64-bit
> kernel reference 'sys_rename'. Thus, i am pointing both perf events at
> the same meta data. Frederic was saying they need to be separate. I'm
> not sure i completely understand why, since the 32-bit are just sign
> extended to 64-bit in this case. Frederic, perhaps, you can explain this
> a bit more for me?
> 
> thanks,
> 
> -Jason

Hi Jason,

I'm currently cleaning up my patch series for ftrace syscalls on PowerPC
and want to release it soon.

It's probably easiest for me if I release your compat syscall support v3
patches as part of the series. You'd still be marked as the author of
those commits - the only changes I have made to them was rebasing them
against the current tip tree and resolving the conflicts that I came
across.

Is that OK with you? Otherwise I can wait until you put out the v4
patches then rebase mine on top of those.

Cheers,
-Ian