linux-kernel - [PATCH v2] riscv: mm: fix NOCACHE_THEAD does not set bit[61] correctly

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Message-ID: <tencent_E19FA1A095768063102E654C6FC858A32F06@qq.com>
Date: Wed, 21 Feb 2024 11:02:31 +0800
From: Yangyu Chen <cyy@...self.name>
To: linux-riscv@...ts.infradead.org
Cc: Jisheng Zhang <jszhang@...nel.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Guo Ren <guoren@...nel.org>,
	Alexandre Ghiti <alexghiti@...osinc.com>,
	linux-kernel@...r.kernel.org,
	Yangyu Chen <cyy@...self.name>
Subject: [PATCH v2] riscv: mm: fix NOCACHE_THEAD does not set bit[61] correctly

Previous commit dbfbda3bd6bf ("riscv: mm: update T-Head memory type
definitions") from patch [1] missed a `<` for bit shifting, result in
bit(61) does not set in _PAGE_NOCACHE_THEAD and leaves bit(0) set instead.
This patch get this fixed.

Changes since v1:
* reword commit message and add reviewed-by

Link: https://lore.kernel.org/linux-riscv/20230912072510.2510-1-jszhang@kernel.org/ [1]
Fixes: dbfbda3bd6bf ("riscv: mm: update T-Head memory type definitions")
Signed-off-by: Yangyu Chen <cyy@...self.name>
Reviewed-by: Guo Ren <guoren@...nel.org>
Reviewed-by: Jisheng Zhang <jszhang@...nel.org>
---
 arch/riscv/include/asm/pgtable-64.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/include/asm/pgtable-64.h b/arch/riscv/include/asm/pgtable-64.h
index b42017d76924..b99bd66107a6 100644
--- a/arch/riscv/include/asm/pgtable-64.h
+++ b/arch/riscv/include/asm/pgtable-64.h
@@ -136,7 +136,7 @@ enum napot_cont_order {
  * 10010 - IO   Strongly-ordered, Non-cacheable, Non-bufferable, Shareable, Non-trustable
  */
 #define _PAGE_PMA_THEAD		((1UL << 62) | (1UL << 61) | (1UL << 60))
-#define _PAGE_NOCACHE_THEAD	((1UL < 61) | (1UL << 60))
+#define _PAGE_NOCACHE_THEAD	((1UL << 61) | (1UL << 60))
 #define _PAGE_IO_THEAD		((1UL << 63) | (1UL << 60))
 #define _PAGE_MTMASK_THEAD	(_PAGE_PMA_THEAD | _PAGE_IO_THEAD | (1UL << 59))
 
-- 
2.43.0