linux-kernel - Re: [PATCH] riscv: vector: Check SR

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Date: Thu, 11 Jan 2024 07:36:50 -0800 (PST)
From: Palmer Dabbelt <palmer@...belt.com>
To: andy.chiu@...ive.com
CC: patchwork-bot+linux-riscv@...nel.org, songshuaishuai@...ylab.org,
  linux-riscv@...ts.infradead.org, Paul Walmsley <paul.walmsley@...ive.com>, aou@...s.berkeley.edu,
  greentime.hu@...ive.com, Conor Dooley <conor.dooley@...rochip.com>, guoren@...nel.org,
  Bjorn Topel <bjorn@...osinc.com>, xiao.w.wang@...el.com, heiko@...ech.de, ruinland.tsai@...ive.com,
  linux-kernel@...r.kernel.org
Subject:     Re: [PATCH] riscv: vector: Check SR_SD before saving vstate

On Thu, 11 Jan 2024 07:16:06 PST (-0800), andy.chiu@...ive.com wrote:
> Hi Palmer,
>
> On Thu, Jan 11, 2024 at 10:50 PM <patchwork-bot+linux-riscv@...nel.org> wrote:
>>
>> Hello:
>>
>> This patch was applied to riscv/linux.git (for-next)
>
> IIUC the conclusion for this thread is not to check SD bit for either
> vector or fpu. The patch for this was sent together with the
> kernel-mode vector series and has been reviewed-by both Song and Guo.
>
>> by Palmer Dabbelt <palmer@...osinc.com>:
>>
>> On Thu, 21 Dec 2023 15:04:49 +0800 you wrote:
>> > The SD bit summarizes the dirty states of FS, VS, or XS fields,
>> > providing a "fast check" before saving fstate or vstate.
>> >
>> > Let __switch_to_vector() check SD bit as __switch_to_fpu() does.
>> >
>> > Fixes: 3a2df6323def ("riscv: Add task switch support for vector")
>> > Signed-off-by: Song Shuai <songshuaishuai@...ylab.org>
>> >
>> > [...]
>>
>> Here is the summary with links:
>>   - riscv: vector: Check SR_SD before saving vstate
>>     https://git.kernel.org/riscv/c/e1b76bc00ed1
>>
>> You are awesome, thank you!
>> --
>> Deet-doot-dot, I am a bot.
>> https://korg.docs.kernel.org/patchwork/pwbot.html
>>
>>
>
> Please let me know if I missed anything.

Sorry, I must have misunderstood.  I'm dropping it.