linux-kernel - [PATCH 4.19 25/85] riscv: Make __fstate

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Date:   Thu, 22 Aug 2019 10:18:58 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Vincent Chen <vincent.chen@...ive.com>,
        Anup Patel <anup@...infault.org>,
        Christoph Hellwig <hch@....de>,
        Paul Walmsley <paul.walmsley@...ive.com>
Subject: [PATCH 4.19 25/85] riscv: Make __fstate_clean() work correctly.

From: Vincent Chen <vincent.chen@...ive.com>

commit 69703eb9a8ae28a46cd5bce7d69ceeef6273a104 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/riscv/include/asm/switch_to.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/riscv/include/asm/switch_to.h
+++ b/arch/riscv/include/asm/switch_to.h
@@ -23,7 +23,7 @@ extern void __fstate_restore(struct task
 
 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_save(struct task_struct *task,