linux-kernel - [PATCH RFC 06/13] mm/arm: Use macros to define pmd/pud helpers

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Date: Wed,  6 Mar 2024 18:41:40 +0800
From: peterx@...hat.com
To: linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Cc: linuxppc-dev@...ts.ozlabs.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Muchun Song <muchun.song@...ux.dev>,
	Jason Gunthorpe <jgg@...dia.com>,
	peterx@...hat.com,
	Matthew Wilcox <willy@...radead.org>,
	Mike Rapoport <rppt@...nel.org>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	x86@...nel.org,
	sparclinux@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Russell King <linux@...linux.org.uk>,
	Shawn Guo <shawnguo@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Fabio Estevam <festevam@...x.de>
Subject: [PATCH RFC 06/13] mm/arm: Use macros to define pmd/pud helpers

From: Peter Xu <peterx@...hat.com>

It's already confusing that ARM 2-level v.s. 3-level defines SECT bit
differently on pmd/puds.  Always use a macro which is much clearer.

Cc: Russell King <linux@...linux.org.uk>
Cc: Shawn Guo <shawnguo@...nel.org>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: Bjorn Andersson <andersson@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Konrad Dybcio <konrad.dybcio@...aro.org>
Cc: Fabio Estevam <festevam@...x.de>
Cc: linux-arm-kernel@...ts.infradead.org
Signed-off-by: Peter Xu <peterx@...hat.com>
---
 arch/arm/include/asm/pgtable-2level.h       | 4 ++--
 arch/arm/include/asm/pgtable-3level-hwdef.h | 1 +
 arch/arm/include/asm/pgtable-3level.h       | 4 ++--
 3 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/arch/arm/include/asm/pgtable-2level.h b/arch/arm/include/asm/pgtable-2level.h
index b0a262566eb9..4245c2e74720 100644
--- a/arch/arm/include/asm/pgtable-2level.h
+++ b/arch/arm/include/asm/pgtable-2level.h
@@ -213,8 +213,8 @@ static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr)
 
 #define pmd_pfn(pmd)		(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK))
 
-#define pmd_leaf(pmd)		(pmd_val(pmd) & 2)
-#define pmd_bad(pmd)		(pmd_val(pmd) & 2)
+#define pmd_leaf(pmd)		(pmd_val(pmd) & PMD_TYPE_SECT)
+#define pmd_bad(pmd)		pmd_leaf(pmd)
 #define pmd_present(pmd)	(pmd_val(pmd))
 
 #define copy_pmd(pmdpd,pmdps)		\
diff --git a/arch/arm/include/asm/pgtable-3level-hwdef.h b/arch/arm/include/asm/pgtable-3level-hwdef.h
index 2f35b4eddaa8..e7b666cf0060 100644
--- a/arch/arm/include/asm/pgtable-3level-hwdef.h
+++ b/arch/arm/include/asm/pgtable-3level-hwdef.h
@@ -14,6 +14,7 @@
  * + Level 1/2 descriptor
  *   - common
  */
+#define PUD_TABLE_BIT		(_AT(pmdval_t, 1) << 1)
 #define PMD_TYPE_MASK		(_AT(pmdval_t, 3) << 0)
 #define PMD_TYPE_FAULT		(_AT(pmdval_t, 0) << 0)
 #define PMD_TYPE_TABLE		(_AT(pmdval_t, 3) << 0)
diff --git a/arch/arm/include/asm/pgtable-3level.h b/arch/arm/include/asm/pgtable-3level.h
index 4b1d9eb3908a..e7aecbef75c9 100644
--- a/arch/arm/include/asm/pgtable-3level.h
+++ b/arch/arm/include/asm/pgtable-3level.h
@@ -112,7 +112,7 @@
 #ifndef __ASSEMBLY__
 
 #define pud_none(pud)		(!pud_val(pud))
-#define pud_bad(pud)		(!(pud_val(pud) & 2))
+#define pud_bad(pud)		(!(pud_val(pud) & PUD_TABLE_BIT))
 #define pud_present(pud)	(pud_val(pud))
 #define pmd_table(pmd)		((pmd_val(pmd) & PMD_TYPE_MASK) == \
 						 PMD_TYPE_TABLE)
@@ -137,7 +137,7 @@ static inline pmd_t *pud_pgtable(pud_t pud)
 	return __va(pud_val(pud) & PHYS_MASK & (s32)PAGE_MASK);
 }
 
-#define pmd_bad(pmd)		(!(pmd_val(pmd) & 2))
+#define pmd_bad(pmd)		(!(pmd_val(pmd) & PMD_TABLE_BIT))
 
 #define copy_pmd(pmdpd,pmdps)		\
 	do {				\
-- 
2.44.0