linux-kernel - [PATCH 2/2] riscv: Simplify the checking for SR

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Message-Id: <4bac52941700cd7b714a41606df7b53f4cf24824.1594629047.git.greentime.hu@sifive.com>
Date:   Mon, 13 Jul 2020 16:32:16 +0800
From:   Greentime Hu <greentime.hu@...ive.com>
To:     greentime.hu@...ive.com, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, aou@...s.berkeley.edu,
        palmer@...belt.com, paul.walmsley@...ive.com
Subject: [PATCH 2/2] riscv: Simplify the checking for SR_PP

This patch simplifies the checking for SR_MPP and SR_SPP. It uses SR_PP in the
code flow for both m-mode and s-mode then we can remove the ifdef here.

Signed-off-by: Greentime Hu <greentime.hu@...ive.com>
---
 arch/riscv/kernel/entry.S | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S
index 000984695cd6..597beae0d238 100644
--- a/arch/riscv/kernel/entry.S
+++ b/arch/riscv/kernel/entry.S
@@ -210,13 +210,8 @@ ret_from_syscall_rejected:
 ret_from_exception:
 	REG_L s0, PT_STATUS(sp)
 	csrc CSR_STATUS, SR_IE
-#ifdef CONFIG_RISCV_M_MODE
-	/* the MPP value is too large to be used as an immediate arg for addi */
-	li t0, SR_MPP
+	li t0, SR_PP
 	and s0, s0, t0
-#else
-	andi s0, s0, SR_SPP
-#endif
 	bnez s0, resume_kernel
 
 resume_userspace:
-- 
2.27.0