linux-kernel - [PATCH] LoongArch: Remove redundant code in head.S

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Message-ID: <20260115063633.1388470-1-chenhuacai@loongson.cn>
Date: Thu, 15 Jan 2026 14:36:33 +0800
From: Huacai Chen <chenhuacai@...ngson.cn>
To: Huacai Chen <chenhuacai@...nel.org>
Cc: loongarch@...ts.linux.dev,
	Xuefeng Li <lixuefeng@...ngson.cn>,
	Guo Ren <guoren@...nel.org>,
	Xuerui Wang <kernel@...0n.name>,
	Jiaxun Yang <jiaxun.yang@...goat.com>,
	linux-kernel@...r.kernel.org,
	Huacai Chen <chenhuacai@...ngson.cn>
Subject: [PATCH] LoongArch: Remove redundant code in head.S

SETUP_MODES already setup the initial values of CSR.CRMD, CSR.PRMD and
CSR.EUEN, so the redundant open code can be removed.

Fixes: 7b2afeafaf9c2d5 ("LoongArch: Adjust boot & setup for 32BIT/64BIT")
Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
---
 arch/loongarch/kernel/head.S | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/arch/loongarch/kernel/head.S b/arch/loongarch/kernel/head.S
index 7f288e89573b..4eed7bc312a8 100644
--- a/arch/loongarch/kernel/head.S
+++ b/arch/loongarch/kernel/head.S
@@ -126,14 +126,6 @@ SYM_CODE_START(smpboot_entry)
 	LONG_LI		t1, CSR_STFILL
 	csrxchg		t0, t1, LOONGARCH_CSR_IMPCTL1
 #endif
-	/* Enable PG */
-	li.w		t0, 0xb0		# PLV=0, IE=0, PG=1
-	csrwr		t0, LOONGARCH_CSR_CRMD
-	li.w		t0, 0x04		# PLV=0, PIE=1, PWE=0
-	csrwr		t0, LOONGARCH_CSR_PRMD
-	li.w		t0, 0x00		# FPE=0, SXE=0, ASXE=0, BTE=0
-	csrwr		t0, LOONGARCH_CSR_EUEN
-
 	la.pcrel	t0, cpuboot_data
 	ld.d		sp, t0, CPU_BOOT_STACK
 	ld.d		tp, t0, CPU_BOOT_TINFO
-- 
2.47.3