[PATCH 13/14] arm64/fpsimd: signal: Always save+flush state early

[Mark Brown]

On Fri, Apr 04, 2025 at 06:44:34PM +0100, Mark Rutland wrote:
> There are several issues with the way the native signal handling code
> manipulates FPSIMD/SVE/SME state, described in detail below. These
> issues largely result from races with preemption and inconsistent
> handling of live state vs saved state.

> ---
>  arch/arm64/include/asm/fpsimd.h |  1 -
>  arch/arm64/kernel/fpsimd.c      | 28 --------------
>  arch/arm64/kernel/signal.c      | 66 ++++++---------------------------
>  3 files changed, 12 insertions(+), 83 deletions(-)

The diffstat involves a lot of no longer needed comments but it's a good
sign of the improvements we're seeing here:

Reviewed-by: Mark Brown <broonie at kernel.org>
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