On Fri, Nov 13, 2020 at 03:02:19PM +0100, Thomas Gleixner wrote:

RT requires the softirq to be preemptible and uses a per CPU local lock to
protect BH disabled sections and softirq processing. Therefore RT cannot
use the preempt counter to keep track of BH disabled/serving.

Add a RT only counter to task struct and adjust the relevant macros in
preempt.h.

You may want to describe a bit the reason for this per task counter.
It's not intuitive at this stage.

Thanks.

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