arm64/fpsimd: Exit streaming mode when flushing tasks

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Ensure there is no path where we might attempt to save SME state after we
flush a task by updating the SVCR register state as well as updating our
in memory state. I haven't seen a specific case where this is happening or
seen a path where it might happen but for the cost of a single low overhead
instruction it seems sensible to close the potential gap.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230607-arm64-flush-svcr-v2-1-827306001841@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Mark Brown 2023-06-09 23:43:41 +01:00 • committed by Catalin Marinas

parent ab9b400809

commit af3215fd02

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arch/arm64/kernel/fpsimd.c

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