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

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Date:   Thu,  8 Aug 2019 15:58:41 +0800
From:   Vincent Chen <vincent.chen@...ive.com>
To:     paul.walmsley@...ive.com, palmer@...ive.com, aou@...s.berkeley.edu
Cc:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Vincent Chen <vincent.chen@...ive.com>
Subject: [PATCH 2/2] riscv: Make __fstate_clean() can work correctly.

Make the __fstate_clean() function can correctly set the
state of sstatus.FS in pt_regs to SR_FS_CLEAN.

Tested on both QEMU and HiFive Unleashed using BBL + Linux.

Signed-off-by: Vincent Chen <vincent.chen@...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 d5fe573..544f99a 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