Message-Id: <20241030063905.2434824-1-maobibo@loongson.cn>
Date: Wed, 30 Oct 2024 14:39:05 +0800
From: Bibo Mao <maobibo@...ngson.cn>
To: Huacai Chen <chenhuacai@...nel.org>,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrey Ryabinin <ryabinin.a.a@...il.com>
Cc: loongarch@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	linux-mips@...r.kernel.org,
	linux-mm@...ck.org,
	kasan-dev@...glegroups.com,
	Alexander Potapenko <glider@...gle.com>,
	Andrey Konovalov <andreyknvl@...il.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Vincenzo Frascino <vincenzo.frascino@....com>,
	WANG Xuerui <kernel@...0n.name>
Subject: [PATCH v2] mm: define general function pXd_init()

Function pud_init(), pmd_init() and kernel_pte_init() are duplicated
defined in file kasan.c and sparse-vmemmap.c as weak functions. Move
them to generic header file pgtable.h, architecture can redefine them.

Signed-off-by: Bibo Mao <maobibo@...ngson.cn>
---
v1 ... v2:
  1. Add general function definition about kernel_pte_init().
---
 arch/loongarch/include/asm/pgtable.h |  3 +++
 arch/mips/include/asm/pgtable-64.h   |  2 ++
 include/linux/mm.h                   |  3 ---
 include/linux/pgtable.h              | 21 +++++++++++++++++++++
 mm/kasan/init.c                      | 12 ------------
 mm/sparse-vmemmap.c                  | 12 ------------
 6 files changed, 26 insertions(+), 27 deletions(-)

diff --git a/arch/loongarch/include/asm/pgtable.h b/arch/loongarch/include/asm/pgtable.h
index 20714b73f14c..df5889d995f9 100644
--- a/arch/loongarch/include/asm/pgtable.h
+++ b/arch/loongarch/include/asm/pgtable.h
@@ -267,8 +267,11 @@ extern void set_pmd_at(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp, pm
  * Initialize a new pgd / pud / pmd table with invalid pointers.
  */
 extern void pgd_init(void *addr);
+#define pud_init pud_init
 extern void pud_init(void *addr);
+#define pmd_init pmd_init
 extern void pmd_init(void *addr);
+#define kernel_pte_init kernel_pte_init
 extern void kernel_pte_init(void *addr);
 
 /*
diff --git a/arch/mips/include/asm/pgtable-64.h b/arch/mips/include/asm/pgtable-64.h
index 401c1d9e4409..45c8572a0462 100644
--- a/arch/mips/include/asm/pgtable-64.h
+++ b/arch/mips/include/asm/pgtable-64.h
@@ -316,7 +316,9 @@ static inline pmd_t *pud_pgtable(pud_t pud)
  * Initialize a new pgd / pud / pmd table with invalid pointers.
  */
 extern void pgd_init(void *addr);
+#define pud_init pud_init
 extern void pud_init(void *addr);
+#define pmd_init pmd_init
 extern void pmd_init(void *addr);
 
 /*
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 61fff5d34ed5..651bdc1bef48 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -3818,9 +3818,6 @@ void *sparse_buffer_alloc(unsigned long size);
 struct page * __populate_section_memmap(unsigned long pfn,
 		unsigned long nr_pages, int nid, struct vmem_altmap *altmap,
 		struct dev_pagemap *pgmap);
-void pud_init(void *addr);
-void pmd_init(void *addr);
-void kernel_pte_init(void *addr);
 pgd_t *vmemmap_pgd_populate(unsigned long addr, int node);
 p4d_t *vmemmap_p4d_populate(pgd_t *pgd, unsigned long addr, int node);
 pud_t *vmemmap_pud_populate(p4d_t *p4d, unsigned long addr, int node);
diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
index e8b2ac6bd2ae..adee214c21f8 100644
--- a/include/linux/pgtable.h
+++ b/include/linux/pgtable.h
@@ -90,6 +90,27 @@ static inline unsigned long pud_index(unsigned long address)
 #define pgd_index(a)  (((a) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
 #endif
 
+#ifndef kernel_pte_init
+static inline void kernel_pte_init(void *addr)
+{
+}
+#define kernel_pte_init kernel_pte_init
+#endif
+
+#ifndef pmd_init
+static inline void pmd_init(void *addr)
+{
+}
+#define pmd_init pmd_init
+#endif
+
+#ifndef pud_init
+static inline void pud_init(void *addr)
+{
+}
+#define pud_init pud_init
+#endif
+
 #ifndef pte_offset_kernel
 static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address)
 {
diff --git a/mm/kasan/init.c b/mm/kasan/init.c
index ac607c306292..ced6b29fcf76 100644
--- a/mm/kasan/init.c
+++ b/mm/kasan/init.c
@@ -106,10 +106,6 @@ static void __ref zero_pte_populate(pmd_t *pmd, unsigned long addr,
 	}
 }
 
-void __weak __meminit kernel_pte_init(void *addr)
-{
-}
-
 static int __ref zero_pmd_populate(pud_t *pud, unsigned long addr,
 				unsigned long end)
 {
@@ -145,10 +141,6 @@ static int __ref zero_pmd_populate(pud_t *pud, unsigned long addr,
 	return 0;
 }
 
-void __weak __meminit pmd_init(void *addr)
-{
-}
-
 static int __ref zero_pud_populate(p4d_t *p4d, unsigned long addr,
 				unsigned long end)
 {
@@ -187,10 +179,6 @@ static int __ref zero_pud_populate(p4d_t *p4d, unsigned long addr,
 	return 0;
 }
 
-void __weak __meminit pud_init(void *addr)
-{
-}
-
 static int __ref zero_p4d_populate(pgd_t *pgd, unsigned long addr,
 				unsigned long end)
 {
diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c
index c0388b2e959d..cec67c5f37d8 100644
--- a/mm/sparse-vmemmap.c
+++ b/mm/sparse-vmemmap.c
@@ -184,10 +184,6 @@ static void * __meminit vmemmap_alloc_block_zero(unsigned long size, int node)
 	return p;
 }
 
-void __weak __meminit kernel_pte_init(void *addr)
-{
-}
-
 pmd_t * __meminit vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node)
 {
 	pmd_t *pmd = pmd_offset(pud, addr);
@@ -201,10 +197,6 @@ pmd_t * __meminit vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node)
 	return pmd;
 }
 
-void __weak __meminit pmd_init(void *addr)
-{
-}
-
 pud_t * __meminit vmemmap_pud_populate(p4d_t *p4d, unsigned long addr, int node)
 {
 	pud_t *pud = pud_offset(p4d, addr);
@@ -218,10 +210,6 @@ pud_t * __meminit vmemmap_pud_populate(p4d_t *p4d, unsigned long addr, int node)
 	return pud;
 }
 
-void __weak __meminit pud_init(void *addr)
-{
-}
-
 p4d_t * __meminit vmemmap_p4d_populate(pgd_t *pgd, unsigned long addr, int node)
 {
 	p4d_t *p4d = p4d_offset(pgd, addr);

base-commit: 81983758430957d9a5cb3333fe324fd70cf63e7e
-- 
2.39.3

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