linux-kernel - Re: [PATCH v2 2/2] riscv: Make __fstate

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Date:   Wed, 14 Aug 2019 14:29:24 -0700 (PDT)
From:   Palmer Dabbelt <palmer@...ive.com>
To:     Paul Walmsley <paul.walmsley@...ive.com>
CC:     vincent.chen@...ive.com, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject:     Re: [PATCH v2 2/2] riscv: Make __fstate_clean() work correctly.

On Wed, 14 Aug 2019 13:32:50 PDT (-0700), Paul Walmsley wrote:
> On Wed, 14 Aug 2019, Vincent Chen wrote:
>
>> Make the __fstate_clean() function correctly set the
>> state of sstatus.FS in pt_regs to SR_FS_CLEAN.
>>
>> Fixes: 7db91e5 ("RISC-V: Task implementation")
>> Cc: linux-stable <stable@...r.kernel.org>
>> Signed-off-by: Vincent Chen <vincent.chen@...ive.com>
>> Reviewed-by: Anup Patel <anup@...infault.org>
>> Reviewed-by: Christoph Hellwig <hch@....de>
>
> Thanks, I extended the "Fixes" commit ID to 12 digits, as is the usual
> practice here, and have queued the following for v5.3-rc.

For reference, something like "git config core.abbrev=12" (or whatever you 
write to get this in your .gitconfig)

    https://github.com/palmer-dabbelt/home/blob/master/.gitconfig.in#L23

causes git to do the right thing.

> - Paul
>
> From: Vincent Chen <vincent.chen@...ive.com>
> Date: Wed, 14 Aug 2019 16:23:53 +0800
> Subject: [PATCH] riscv: Make __fstate_clean() work correctly.
>
> Make the __fstate_clean() function correctly set the
> state of sstatus.FS in pt_regs to SR_FS_CLEAN.
>
> Fixes: 7db91e57a0acd ("RISC-V: Task implementation")
> Cc: linux-stable <stable@...r.kernel.org>
> Signed-off-by: Vincent Chen <vincent.chen@...ive.com>
> Reviewed-by: Anup Patel <anup@...infault.org>
> Reviewed-by: Christoph Hellwig <hch@....de>
> [paul.walmsley@...ive.com: expanded "Fixes" commit ID]
> Signed-off-by: Paul Walmsley <paul.walmsley@...ive.com>
> ---
>  arch/riscv/include/asm/switch_to.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/riscv/include/asm/switch_to.h b/arch/riscv/include/asm/switch_to.h
> index 949d9cd91dec..f0227bdce0f0 100644
> --- a/arch/riscv/include/asm/switch_to.h
> +++ b/arch/riscv/include/asm/switch_to.h
> @@ -16,7 +16,7 @@ extern void __fstate_restore(struct task_struct *restore_from);
>
>  static inline void __fstate_clean(struct pt_regs *regs)
>  {
> -	regs->sstatus |= (regs->sstatus & ~(SR_FS)) | SR_FS_CLEAN;
> +	regs->sstatus = (regs->sstatus & ~SR_FS) | SR_FS_CLEAN;
>  }
>
>  static inline void fstate_off(struct task_struct *task,