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From: Vincent Chen <vincent.chen@sifive.com>
To: Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@sifive.com>
Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
	Vincent Chen <vincent.chen@sifive.com>,
	linux-stable <stable@vger.kernel.org>
Subject: [PATCH v2 2/2] riscv: Make __fstate_clean() work correctly.
Date: Wed, 14 Aug 2019 16:23:53 +0800
Message-ID: <1565771033-1831-3-git-send-email-vincent.chen@sifive.com> (raw)
In-Reply-To: <1565771033-1831-1-git-send-email-vincent.chen@sifive.com>

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@vger.kernel.org>
Signed-off-by: Vincent Chen <vincent.chen@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>

---
 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 0575b8a..0aa5b94 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,
-- 
2.7.4


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