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    SubjectRe: [PATCH] (18/22) task_thread_info - part 2/4
    On Thu, Aug 25, 2005 at 04:10:38PM +0200, Roman Zippel wrote:
    > Hi,
    > On Thu, 25 Aug 2005, Al Viro wrote:
    > > On Thu, Aug 25, 2005 at 11:15:24AM +0200, Roman Zippel wrote:
    > > > >
    > > > > - *ti = *orig->thread_info;
    > > > > *tsk = *orig;
    > > > > + setup_thread_info(tsk, ti);
    > > > > tsk->thread_info = ti;
    > > > > ti->task = tsk;
    > > >
    > > > This introduces a subtle ordering requirement, where setup_thread_info
    > > > magically finds in the new task_struct the pointer to the old thread_info
    > > > to setup the new thread_info.
    > >
    > > Nothing subtle with it, especially since this is the only place with any
    > > business to call setup_thread_info().
    > Wrong, we could have multiple versions setup_thread_info() and every one
    > gets the pointer to old thread_info via the new task_struct.

    How does that make what I wrote above wrong? We do have two versions, all
    right. Called from one place. Each is a one-liner in my variant, more than
    that in your.

    > > > What is your problem with what I have in CVS? There it completes the basic
    > > > task_struct setup and _after_ that it can setup the thread_info.
    > >
    > > Which buys you what, exactly? You end up with more things to do in
    > > setup_thread_info() and it doesn't get cleaner.
    > Wrong.
    > +static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
    > +{
    > + *task_thread_info(p) = *task_thread_info(org);
    > + task_thread_info(p)->task = p;
    > +}

    ... and that does not fit "more things to do in setup_thread_info()" in
    which way?

    > > > Al, I would really prefer to merge this one myself, I'm only waiting for
    > > > the 2.6.13 release and since this is not a regression, I don't really
    > > > understand why this must be in 2.6.13.
    > >
    > > Fine, as long as that merge is done before your s/thread_info/stack/ patches.
    > > It should be the first step before doing 200Kb worth of cosmetical stuff
    > > that affects every architecture out there, not something that depends on
    > > it done.
    > Please count correctly, there is only one 100KB patch, the rest is rather
    > small (50KB in 7 patches).

    ... no comments, except that 28K (ti6_1) + 24K (ti6_2) + 22K (ti6_3) +
    12K (ti6_4) already appears to be more than 50K...

    In any case, that's hardly the point - s/200/150/ if you wish and that
    does not make the problem much better.

    > > There's also a question of having mainline build and work on the architecture
    > > in question, which obviously is not something you care about - this hairball
    > > had been sitting in m68k CVS for how long? Since 2.5.60-something, with
    > > zero efforts to resolve it, right? And mainline kernel didn't even build,
    > > let alone work since that moment.
    > >
    > > FWIW, essentially the same splitup of that mess had been posted more than
    > > three months ago; definitely before 2.6.12-final. Still no activity _and_
    > > plans that involve doing kernel-wide renaming of struct thread_info *
    > > thread_info in task_struct to void *stack as part of m68k merge.
    > Al, while I appreciate your iniative, could you please work a little bit
    > more with the other people working on this port? I did take and adapted
    > your patches and posted my versions of it and until yesterday you didn't
    > bother to comment publically. The "no activity" is complete bullshit.

    I seem to remember some very public conversations with you on that topic,
    but again, this is not the point - the real issue is with merge strategy
    you proposed. And no, I do not believe that doing that merge + great
    renaming in a single burst is feasible. Reorder that and yes, all parts
    make sense and are doable. With essentially the same final tree.

    Hell, I can even offer to do and feed the per-arch cleanups of that, getting
    the final chunk down to tolerable size. After and separate from getting m68k
    to work in mainline.

    To clarify the situation: this is _NOT_ an attempt to prevent ->thread_info
    cleanups from getting into the tree. I actually think that they do make
    sense; moreover, they do make sense on their own and mixing them with m68k
    merge only causes extra problems for both.
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