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            <b><a class="bz_bug_link 
          bz_status_REOPENED "
   title="REOPENED --- - Corruption in some windows after returning from xlock"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=72375#c25">Comment # 25</a>
              on <a class="bz_bug_link 
          bz_status_REOPENED "
   title="REOPENED --- - Corruption in some windows after returning from xlock"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=72375">bug 72375</a>
              from <span class="vcard"><a class="email" href="mailto:imirkin@alum.mit.edu" title="Ilia Mirkin <imirkin@alum.mit.edu>"> <span class="fn">Ilia Mirkin</span></a>
</span></b>
        <pre>That didn't work. I won't pretend to even know what a flush or a stall is,
however by pure code analysis, I think your patch isn't restoring the old
behaviour. I changed it to

-       need_flush =
-               gen6_emit_cc(sna, GEN6_BLEND(op->u.gen6.flags)) &&
-               wm_binding_table & 1;
+       need_stall = need_flush = false;
+       if (gen6_emit_cc(sna, GEN6_BLEND(op->u.gen6.flags))) {
+               if (wm_binding_table & 1)
+                       need_flush = true;
+       }
+               else
+                       need_stall = wm_binding_table & 1;

and that appears to work fine. Note that before, need_stall was always set, and
if gen6_emit_cc(), it was reset to false.

I think a cleaner way to write this might be

need_stall = wm_binding_table & 1;
if (gen6_emit_cc(...))
   need_flush = need_stall;

[and then the flush logic clears need_stall, which is nice]</pre>
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