There was a bug report on PREEMPT_RT which made me look into VFP locking
on ARM. The usage of local_bh_disable() to ensure exclusive access to
the VFP unit is not working on PREEMPT_RT because the softirq context is
preemptible.

This series introduces vfp_lock() which does the right thing.

v3…v4:
    - Repost.

v2…v3: https://lore.kernel.org/all/20230926125502.1127015-1-bigeasy@linutronix.de (local)
    - Repost with Ard's Reviewed-by tag.

v1…v2: https://lore.kernel.org/all/20230628080516.798032-1-bigeasy@linutronix.de (local)
    - Split the last patch into two patches (3 and 4 of this series).
      Suggested by Ard.

v1: https://lore.kernel.org/all/20230615101656.1308942-1-bigeasy@linutronix.de (local)

Sebastian

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