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[v6,0/4] ARM: vfp: Introduce vfp_state_hold() to acquire VFP context.

Message ID 20240701110317.99631-1-bigeasy@linutronix.de (mailing list archive)
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Series ARM: vfp: Introduce vfp_state_hold() to acquire VFP context. | expand

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Sebastian Andrzej Siewior July 1, 2024, 10:56 a.m. UTC 
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_vfp_state_hold() which does the right thing.

v5…v6: https://lore.kernel.org/all/20240628134648.1852041-1-bigeasy@linutronix.de/
    - Rename vfp_{lock/unlock}() to vfp_state_{hold/release}() as
      suggested by Russell King.

v4…v5: 
    - Repost

v3…v4:
    - Repost.

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

v1…v2: https://lore.kernel.org/all/20230628080516.798032-1-bigeasy@linutronix.de
    - 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