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

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Date:   Wed, 14 Aug 2019 13:32:50 -0700 (PDT)
From:   Paul Walmsley <paul.walmsley@...ive.com>
To:     Vincent Chen <vincent.chen@...ive.com>
cc:     Palmer Dabbelt <palmer@...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, 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.


- 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,
-- 
2.23.0.rc1