On 11/26/25 08:20, Juergen Gross wrote:
While looking at paravirt cleanups I stumbled over slow_down_io() and
the related REALLY_SLOW_IO define.
Especially REALLY_SLOW_IO is a mess, which is proven by 2 completely
wrong use cases.
Do several cleanups, resulting in a deletion of REALLY_SLOW_IO and the
io_delay() paravirt function hook.
Patches 2 and 3 are not changing any functionality, but maybe they
should? As the potential bug has been present for more than a decade
now, I went with just deleting the useless "#define REALLY_SLOW_IO".
The alternative would be to do something similar as in patch 5.
Maybe, but as you point out there has not been a report of a problem
for a long time (who knows if any of the affected systems still exist).
We can apply always apply a fix if it turns out that someone does run
into a problem.
Thanks,
Guenter
