Re: [RESEND PATCH 1/2] sparc64: Rearrange thread info to cheaply clear syscall noerror state.

[Al Viro <viro@ZenIV.linux.org.uk>]

On Fri, Oct 05, 2012 at 10:43:43PM -0400, David Miller wrote:
> From: Al Viro <viro@ZenIV.linux.org.uk>
> Date: Sat, 6 Oct 2012 00:26:51 +0100
> 
> > On Fri, Oct 05, 2012 at 05:48:42PM -0400, David Miller wrote:
> >> 
> >> Al, this change turns out to be broken.
> >> 
> >> If you move the WSAVED byte down past bit 16, it runs into the bit
> >> mask we for the _TI_* flag bits down lower in the file.
> > 
> > Umm...  Right you are.  I wonder why I hadn't stepped into that while
> > testing that sucker... 
> 
> I tested it for 20 hours and didn't hit any problems, so don't feel
> bad. :-)
> 
> > sparc64: clear syscall_noerror on the entry to syscall, not on the exit
> >     
> > Move that sucker to just before TI_FPDEPTH and replace stb with sth in
> > etrap_save().  Take current_ds to its old place, so that we don't push
> > wsaved into TI_... flags.  That allows to lose clearing syscall_noerror
> > on return from syscall.
> > 
> > Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
> 
> I'll look at this later.

... when I send something that compiles and runs.  My apologies; I still think
that solution in this direction can work, but that wasn't it.