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

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Date:   Wed, 14 Aug 2019 16:23:53 +0800
From:   Vincent Chen <vincent.chen@...ive.com>
To:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...ive.com>
Cc:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Vincent Chen <vincent.chen@...ive.com>,
        linux-stable <stable@...r.kernel.org>
Subject: [PATCH v2 2/2] 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: 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>

---
 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