From: Dave Martin <Dave.Martin@arm.com>
To: Julien Grall <julien.grall@arm.com>
Cc: Anton.Kirilov@arm.com, catalin.marinas@arm.com,
will.deacon@arm.com, oleg@redhat.com, zhang.lei@jp.fujitsu.com,
alex.bennee@linaro.org, linux-arm-kernel@lists.infradead.org,
Daniel.Kiss@arm.com
Subject: Re: [RFC PATCH v2 1/8] arm64/fpsimd: Update documentation of do_sve_acc
Date: Fri, 21 Jun 2019 16:32:24 +0100 [thread overview]
Message-ID: <20190621153224.GW2790@e103592.cambridge.arm.com> (raw)
In-Reply-To: <20190613161656.20765-2-julien.grall@arm.com>
On Thu, Jun 13, 2019 at 05:16:49PM +0100, Julien Grall wrote:
> TIF_SVE is cleared by fpsimd_restore_current_state() not
> task_fpsimd_load(). Update the documentation of do_sve_acc to reflect
> this behavior.
>
> Signed-off-by: Julien Grall <julien.grall@arm.com>
>
> ---
> Changes in v2:
> - Fix typo in the commit message
> ---
> arch/arm64/kernel/fpsimd.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c
> index a38bf74bcca8..92f418e4f989 100644
> --- a/arch/arm64/kernel/fpsimd.c
> +++ b/arch/arm64/kernel/fpsimd.c
> @@ -853,7 +853,7 @@ void fpsimd_release_task(struct task_struct *dead_task)
> * the SVE access trap will be disabled the next time this task
> * reaches ret_to_user.
> *
> - * TIF_SVE should be clear on entry: otherwise, task_fpsimd_load()
> + * TIF_SVE should be clear on entry: otherwise, fpsimd_restore_current_state()
> * would have disabled the SVE access trap for userspace during
> * ret_to_user, making an SVE access trap impossible in that case.
> */
Good spot, thanks!
Modulo any outstanding comments from Mark,
Reviewed-by: Dave Martin <Dave.Martin@arm.com>
Cheers
---Dave
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next prev parent reply other threads:[~2019-06-21 15:32 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-13 16:16 [RFC PATCH v2 0/8] arm64/sve: First steps towards optimizing syscalls Julien Grall
2019-06-13 16:16 ` [RFC PATCH v2 1/8] arm64/fpsimd: Update documentation of do_sve_acc Julien Grall
2019-06-13 16:19 ` Julien Grall
2019-06-21 15:32 ` Dave Martin [this message]
2019-06-13 16:16 ` [RFC PATCH v2 2/8] arm64/signal: Update the comment in preserve_sve_context Julien Grall
2019-06-21 15:32 ` Dave Martin
2019-06-13 16:16 ` [RFC PATCH v2 3/8] arm64/fpsimdmacros: Allow the macro "for" to be used in more cases Julien Grall
2019-06-21 15:32 ` Dave Martin
2019-06-24 16:10 ` Julien Grall
2019-06-25 9:35 ` Dave Martin
2019-06-13 16:16 ` [RFC PATCH v2 4/8] arm64/fpsimdmacros: Introduce a macro to update ZCR_EL1.LEN Julien Grall
2019-06-21 15:32 ` Dave Martin
2019-06-13 16:16 ` [RFC PATCH v2 5/8] arm64/sve: Implement an helper to flush SVE registers Julien Grall
2019-06-21 15:33 ` Dave Martin
2019-06-24 16:28 ` Julien Grall
2019-06-25 9:37 ` Dave Martin
2019-06-13 16:16 ` [RFC PATCH v2 6/8] arm64/sve: Implement an helper to load SVE registers from FPSIMD state Julien Grall
2019-06-21 15:33 ` Dave Martin
2019-06-24 16:29 ` Julien Grall
2019-06-13 16:16 ` [RFC PATCH v2 7/8] arm64/sve: Don't disable SVE on syscalls return Julien Grall
2019-06-21 15:33 ` Dave Martin
2019-06-24 16:44 ` Julien Grall
2019-06-25 9:41 ` Dave Martin
2019-07-04 14:15 ` Catalin Marinas
2019-08-02 11:06 ` Julien Grall
2019-06-13 16:16 ` [RFC PATCH v2 8/8] arm64/sve: Rework SVE trap access to use TIF_SVE_NEEDS_FLUSH Julien Grall
2019-06-21 15:33 ` Dave Martin
2019-06-21 15:32 ` [RFC PATCH v2 0/8] arm64/sve: First steps towards optimizing syscalls Dave Martin
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