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From: Will Deacon <will@kernel.org>
To: linux-arm-kernel@lists.infradead.org
Cc: kernel-team@android.com, Will Deacon <will@kernel.org>,
	Christoph Hellwig <hch@lst.de>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Ard Biesheuvel <ardb@kernel.org>,
	Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
	Mark Rutland <mark.rutland@arm.com>
Subject: [PATCH v2 3/3] arm64: mm: Remove unused support for Normal-WT memory type
Date: Thu, 27 May 2021 12:03:19 +0100	[thread overview]
Message-ID: <20210527110319.22157-4-will@kernel.org> (raw)
In-Reply-To: <20210527110319.22157-1-will@kernel.org>

The Normal-WT memory type is unused, so remove it and reclaim a MAIR.

Cc: Christoph Hellwig <hch@lst.de>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
---
 arch/arm64/include/asm/memory.h       | 5 ++---
 arch/arm64/include/asm/pgtable-prot.h | 1 -
 arch/arm64/include/asm/sysreg.h       | 1 -
 arch/arm64/mm/proc.S                  | 1 -
 4 files changed, 2 insertions(+), 6 deletions(-)

diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
index 1e025e3b655e..7b360960cc35 100644
--- a/arch/arm64/include/asm/memory.h
+++ b/arch/arm64/include/asm/memory.h
@@ -135,9 +135,8 @@
 #define MT_NORMAL		0
 #define MT_NORMAL_TAGGED	1
 #define MT_NORMAL_NC		2
-#define MT_NORMAL_WT		3
-#define MT_DEVICE_nGnRnE	4
-#define MT_DEVICE_nGnRE		5
+#define MT_DEVICE_nGnRnE	3
+#define MT_DEVICE_nGnRE		4
 
 /*
  * Memory types for Stage-2 translation
diff --git a/arch/arm64/include/asm/pgtable-prot.h b/arch/arm64/include/asm/pgtable-prot.h
index 938092df76cf..7032f04c8ac6 100644
--- a/arch/arm64/include/asm/pgtable-prot.h
+++ b/arch/arm64/include/asm/pgtable-prot.h
@@ -55,7 +55,6 @@ extern bool arm64_use_ng_mappings;
 #define PROT_DEVICE_nGnRnE	(PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_DEVICE_nGnRnE))
 #define PROT_DEVICE_nGnRE	(PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_DEVICE_nGnRE))
 #define PROT_NORMAL_NC		(PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_NORMAL_NC))
-#define PROT_NORMAL_WT		(PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_NORMAL_WT))
 #define PROT_NORMAL		(PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_NORMAL))
 #define PROT_NORMAL_TAGGED	(PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_WRITE | PTE_ATTRINDX(MT_NORMAL_TAGGED))
 
diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
index baeb33cd7685..9ea84bcddf85 100644
--- a/arch/arm64/include/asm/sysreg.h
+++ b/arch/arm64/include/asm/sysreg.h
@@ -704,7 +704,6 @@
 #define MAIR_ATTR_DEVICE_nGnRnE		UL(0x00)
 #define MAIR_ATTR_DEVICE_nGnRE		UL(0x04)
 #define MAIR_ATTR_NORMAL_NC		UL(0x44)
-#define MAIR_ATTR_NORMAL_WT		UL(0xbb)
 #define MAIR_ATTR_NORMAL_TAGGED		UL(0xf0)
 #define MAIR_ATTR_NORMAL		UL(0xff)
 #define MAIR_ATTR_MASK			UL(0xff)
diff --git a/arch/arm64/mm/proc.S b/arch/arm64/mm/proc.S
index add026fcc88c..6e640fa9788e 100644
--- a/arch/arm64/mm/proc.S
+++ b/arch/arm64/mm/proc.S
@@ -60,7 +60,6 @@
 	 MAIR_ATTRIDX(MAIR_ATTR_DEVICE_nGnRE, MT_DEVICE_nGnRE) |	\
 	 MAIR_ATTRIDX(MAIR_ATTR_NORMAL_NC, MT_NORMAL_NC) |		\
 	 MAIR_ATTRIDX(MAIR_ATTR_NORMAL, MT_NORMAL) |			\
-	 MAIR_ATTRIDX(MAIR_ATTR_NORMAL_WT, MT_NORMAL_WT) |		\
 	 MAIR_ATTRIDX(MAIR_ATTR_NORMAL, MT_NORMAL_TAGGED))
 
 #ifdef CONFIG_CPU_PM
-- 
2.31.1.818.g46aad6cb9e-goog


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  parent reply	other threads:[~2021-05-27 11:07 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-27 11:03 [PATCH v2 0/3] Free up a couple of MAIRs Will Deacon
2021-05-27 11:03 ` [PATCH v2 1/3] arm64: mm: Remove unused support for Device-GRE memory type Will Deacon
2021-05-27 11:03 ` [PATCH v2 2/3] arm64: acpi: Map EFI_MEMORY_WT memory as Normal-NC Will Deacon
2021-05-27 11:03 ` Will Deacon [this message]
2021-06-01 18:21 ` [PATCH v2 0/3] Free up a couple of MAIRs Will Deacon

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