Mainline in regression-fix mode after Thanksgiving

[Richard Kenner]

    After all, we have an alternative: if a patch causes regressions and
    this isn't promptly fixed, the patch can be reverted.

But this isn't an alternative in the case being discussed, where the patch
causing the regression might have been checked in months ago.  There may
very well be patches applied on top of that patch or other patches that
depend on that patch.  Reverting an old patch can easily cause more regressions
that the patch itself caused.