linux-kernel - [PATCH v2 3/3] mm: Add p{g/4}d_leaf() in asm-generic/pgtable-nop{4/u}d.h

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Message-ID: <f69941b076bf8fec89b6bec5573fdb79483c2a75.1720597744.git.christophe.leroy@csgroup.eu>
Date: Wed, 10 Jul 2024 09:51:22 +0200
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: Andrew Morton <akpm@...ux-foundation.org>,
	Arnd Bergmann <arnd@...db.de>
Cc: Christophe Leroy <christophe.leroy@...roup.eu>,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	x86@...nel.org,
	linux-riscv@...ts.infradead.org,
	Oscar Salvador <osalvador@...e.de>,
	Peter Xu <peterx@...hat.com>
Subject: [PATCH v2 3/3] mm: Add p{g/4}d_leaf() in asm-generic/pgtable-nop{4/u}d.h

Commit 2c8a81dc0cc5 ("riscv/mm: fix two page table check related
issues") added pud_leaf() in include/asm-generic/pgtable-nopmd.h

Do the same for p4d_leaf() and pgd_leaf() to avoid getting them
erroneously defined by architectures that do not implement the
related page level.

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
v2: Added pXd_leaf macro as well in asm-generic/pgtable-nopXd.h to cohabit with the fallback
---
 include/asm-generic/pgtable-nop4d.h | 2 ++
 include/asm-generic/pgtable-nopmd.h | 1 +
 include/asm-generic/pgtable-nopud.h | 2 ++
 3 files changed, 5 insertions(+)

diff --git a/include/asm-generic/pgtable-nop4d.h b/include/asm-generic/pgtable-nop4d.h
index 03b7dae47dd4..ed7ba008469f 100644
--- a/include/asm-generic/pgtable-nop4d.h
+++ b/include/asm-generic/pgtable-nop4d.h
@@ -21,6 +21,8 @@ typedef struct { pgd_t pgd; } p4d_t;
 static inline int pgd_none(pgd_t pgd)		{ return 0; }
 static inline int pgd_bad(pgd_t pgd)		{ return 0; }
 static inline int pgd_present(pgd_t pgd)	{ return 1; }
+static inline int pgd_leaf(pgd_t pgd)		{ return 0; }
+#define pgd_leaf pgd_leaf
 static inline void pgd_clear(pgd_t *pgd)	{ }
 #define p4d_ERROR(p4d)				(pgd_ERROR((p4d).pgd))
 
diff --git a/include/asm-generic/pgtable-nopmd.h b/include/asm-generic/pgtable-nopmd.h
index b01349a312fa..e178ace2e23e 100644
--- a/include/asm-generic/pgtable-nopmd.h
+++ b/include/asm-generic/pgtable-nopmd.h
@@ -31,6 +31,7 @@ static inline int pud_none(pud_t pud)		{ return 0; }
 static inline int pud_bad(pud_t pud)		{ return 0; }
 static inline int pud_present(pud_t pud)	{ return 1; }
 static inline int pud_leaf(pud_t pud)		{ return 0; }
+#define pud_leaf pud_leaf
 static inline void pud_clear(pud_t *pud)	{ }
 #define pmd_ERROR(pmd)				(pud_ERROR((pmd).pud))
 
diff --git a/include/asm-generic/pgtable-nopud.h b/include/asm-generic/pgtable-nopud.h
index eb70c6d7ceff..655dfebea91c 100644
--- a/include/asm-generic/pgtable-nopud.h
+++ b/include/asm-generic/pgtable-nopud.h
@@ -28,6 +28,8 @@ typedef struct { p4d_t p4d; } pud_t;
 static inline int p4d_none(p4d_t p4d)		{ return 0; }
 static inline int p4d_bad(p4d_t p4d)		{ return 0; }
 static inline int p4d_present(p4d_t p4d)	{ return 1; }
+static inline int p4d_leaf(p4d_t p4d)		{ return 0; }
+#define p4d_leaf p4d_leaf
 static inline void p4d_clear(p4d_t *p4d)	{ }
 #define pud_ERROR(pud)				(p4d_ERROR((pud).p4d))
 
-- 
2.44.0