linux-kernel - [PATCH v2 7/7] mm/pgtable: remove unneeded pgd

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Message-ID: <20250331081327.256412-8-bhe@redhat.com>
Date: Mon, 31 Mar 2025 16:13:27 +0800
From: Baoquan He <bhe@...hat.com>
To: akpm@...ux-foundation.org
Cc: linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	yanjun.zhu@...ux.dev,
	Baoquan He <bhe@...hat.com>
Subject: [PATCH v2 7/7] mm/pgtable: remove unneeded pgd_devmap()

There's no user of pgd_devmap() now, remove it from all ARCH-es
and linux/pgtable.h.

Signed-off-by: Baoquan He <bhe@...hat.com>
---
 arch/arm64/include/asm/pgtable.h             | 5 -----
 arch/loongarch/include/asm/pgtable.h         | 1 -
 arch/powerpc/include/asm/book3s/64/pgtable.h | 5 -----
 arch/riscv/include/asm/pgtable-64.h          | 5 -----
 arch/x86/include/asm/pgtable.h               | 5 -----
 include/linux/pgtable.h                      | 4 ----
 6 files changed, 25 deletions(-)

diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 84f05f781a70..e0cab581edc9 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -1230,11 +1230,6 @@ static inline int pud_devmap(pud_t pud)
 {
 	return 0;
 }
-
-static inline int pgd_devmap(pgd_t pgd)
-{
-	return 0;
-}
 #endif
 
 #ifdef CONFIG_PAGE_TABLE_CHECK
diff --git a/arch/loongarch/include/asm/pgtable.h b/arch/loongarch/include/asm/pgtable.h
index da346733a1da..d9b04296d9f5 100644
--- a/arch/loongarch/include/asm/pgtable.h
+++ b/arch/loongarch/include/asm/pgtable.h
@@ -615,7 +615,6 @@ static inline long pmd_protnone(pmd_t pmd)
 
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 #define pud_devmap(pud)		(0)
-#define pgd_devmap(pgd)		(0)
 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 
 /*
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index 6d98e6f08d4d..0da1c8d7f778 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -1405,11 +1405,6 @@ static inline int pud_devmap(pud_t pud)
 {
 	return pte_devmap(pud_pte(pud));
 }
-
-static inline int pgd_devmap(pgd_t pgd)
-{
-	return 0;
-}
 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 
 #define __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
diff --git a/arch/riscv/include/asm/pgtable-64.h b/arch/riscv/include/asm/pgtable-64.h
index 0897dd99ab8d..c6da4c8354a3 100644
--- a/arch/riscv/include/asm/pgtable-64.h
+++ b/arch/riscv/include/asm/pgtable-64.h
@@ -411,11 +411,6 @@ static inline int pud_devmap(pud_t pud)
 {
 	return 0;
 }
-
-static inline int pgd_devmap(pgd_t pgd)
-{
-	return 0;
-}
 #endif
 
 #endif /* _ASM_RISCV_PGTABLE_64_H */
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 5ddba366d3b4..3d6e78af525a 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -361,11 +361,6 @@ static inline pud_t pud_mkspecial(pud_t pud)
 	return pud_set_flags(pud, _PAGE_SPECIAL);
 }
 #endif	/* CONFIG_ARCH_SUPPORTS_PUD_PFNMAP */
-
-static inline int pgd_devmap(pgd_t pgd)
-{
-	return 0;
-}
 #endif
 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 
diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
index 94d267d02372..9d2dd5f71443 100644
--- a/include/linux/pgtable.h
+++ b/include/linux/pgtable.h
@@ -1615,10 +1615,6 @@ static inline int pud_devmap(pud_t pud)
 {
 	return 0;
 }
-static inline int pgd_devmap(pgd_t pgd)
-{
-	return 0;
-}
 #endif
 
 #if !defined(CONFIG_TRANSPARENT_HUGEPAGE) || \
-- 
2.41.0