At this point I am only aware of one place in the kernel where timers and
other BH code interact, that being deliver_to_old_ones() in net/core/dev.c.
Are you absolutely sure? What about serial drivers and the TTY layer?
Have you audited all of that code too? What about SCSI_BH? What
about IMMEDIATE_BH, TQUEUE_BH? Do they interact non-trivially with
timers too?
Alexey is right, there needs to be a real audit here before this
patch may be considered.
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