linux-kernel - [PATCH] riscv: uaccess: Allow the last potential unrolled copy

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Date: Wed, 13 Mar 2024 18:33:34 +0800
From: Xiao Wang <xiao.w.wang@...el.com>
To: paul.walmsley@...ive.com,
	palmer@...belt.com,
	aou@...s.berkeley.edu
Cc: jerry.shih@...ive.com,
	nick.knight@...ive.com,
	ajones@...tanamicro.com,
	bjorn@...osinc.com,
	andy.chiu@...ive.com,
	viro@...iv.linux.org.uk,
	cleger@...osinc.com,
	alexghiti@...osinc.com,
	haicheng.li@...el.com,
	akira.tsukamoto@...il.com,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Xiao Wang <xiao.w.wang@...el.com>
Subject: [PATCH] riscv: uaccess: Allow the last potential unrolled copy

When the dst buffer pointer points to the last accessible aligned addr, we
could still run another iteration of unrolled copy.

Signed-off-by: Xiao Wang <xiao.w.wang@...el.com>
---
 arch/riscv/lib/uaccess.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/lib/uaccess.S b/arch/riscv/lib/uaccess.S
index 2e665f8f8fcc..1399d797d81b 100644
--- a/arch/riscv/lib/uaccess.S
+++ b/arch/riscv/lib/uaccess.S
@@ -103,7 +103,7 @@ SYM_FUNC_START(fallback_scalar_usercopy)
 	fixup REG_S   t4,  7*SZREG(a0), 10f
 	addi	a0, a0, 8*SZREG
 	addi	a1, a1, 8*SZREG
-	bltu	a0, t0, 2b
+	bleu	a0, t0, 2b
 
 	addi	t0, t0, 8*SZREG /* revert to original value */
 	j	.Lbyte_copy_tail
-- 
2.25.1