[PATCH v3 3/9] riscv: mm: Change attribute from __init to __meminit for page functions

Björn Töpel
2024-05-21T11:48:59Z

Prepare for memory hotplugging support by changing from __init to
__meminit for the page table functions that are used by the upcoming
architecture specific callbacks.

Changing the __init attribute to __meminit, avoids that the functions
are removed after init. The __meminit attribute makes sure the
functions are kept in the kernel text post init, but only if memory
hotplugging is enabled for the build.

Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Signed-off-by: Björn Töpel <bjorn@rivosinc.com>
---
arch/riscv/include/asm/mmu.h | 4 +--
arch/riscv/include/asm/pgtable.h | 2 +-
arch/riscv/mm/init.c | 56 ++++++++++++++------------------
3 files changed, 28 insertions(+), 34 deletions(-)

diff --git a/arch/riscv/include/asm/mmu.h b/arch/riscv/include/asm/mmu.h
index 947fd60f9051..c9e03e9da3dc 100644
--- a/arch/riscv/include/asm/mmu.h
+++ b/arch/riscv/include/asm/mmu.h
@@ -31,8 +31,8 @@ typedef struct {
#define cntx2asid(cntx) ((cntx) & SATP_ASID_MASK)
#define cntx2version(cntx) ((cntx) & ~SATP_ASID_MASK)

-void __init create_pgd_mapping(pgd_t *pgdp, uintptr_t va, phys_addr_t pa,
- phys_addr_t sz, pgprot_t prot);
+void __meminit create_pgd_mapping(pgd_t *pgdp, uintptr_t va, phys_addr_t pa, phys_addr_t sz,
+ pgprot_t prot);
#endif /* __ASSEMBLY__ */

#endif /* _ASM_RISCV_MMU_H */
diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index 58fd7b70b903..7933f493db71 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -162,7 +162,7 @@ struct pt_alloc_ops {
#endif
};

-extern struct pt_alloc_ops pt_ops __initdata;
+extern struct pt_alloc_ops pt_ops __meminitdata;

#ifdef CONFIG_MMU
/* Number of PGD entries that a user-mode program can use */
diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index c98010ede810..c969427eab88 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -295,7 +295,7 @@ static void __init setup_bootmem(void)
}

#ifdef CONFIG_MMU
-struct pt_alloc_ops pt_ops __initdata;
+struct pt_alloc_ops pt_ops __meminitdata;

pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
@@ -357,7 +357,7 @@ static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa)
return (pte_t *)set_fixmap_offset(FIX_PTE, pa);
}

-static inline pte_t *__init get_pte_virt_late(phys_addr_t pa)
+static inline pte_t *__meminit get_pte_virt_late(phys_addr_t pa)
{
return (pte_t *) __va(pa);
}
@@ -376,7 +376,7 @@ static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va)
return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
}

-static phys_addr_t __init alloc_pte_late(uintptr_t va)
+static phys_addr_t __meminit alloc_pte_late(uintptr_t va)
{
struct ptdesc *ptdesc = pagetable_alloc(GFP_KERNEL & ~__GFP_HIGHMEM, 0);

@@ -384,9 +384,8 @@ static phys_addr_t __init alloc_pte_late(uintptr_t va)
return __pa((pte_t *)ptdesc_address(ptdesc));
}

-static void __init create_pte_mapping(pte_t *ptep,
- uintptr_t va, phys_addr_t pa,
- phys_addr_t sz, pgprot_t prot)
+static void __meminit create_pte_mapping(pte_t *ptep, uintptr_t va, phys_addr_t pa, phys_addr_t sz,
+ pgprot_t prot)
{
uintptr_t pte_idx = pte_index(va);

@@ -440,7 +439,7 @@ static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa)
return (pmd_t *)set_fixmap_offset(FIX_PMD, pa);
}

-static pmd_t *__init get_pmd_virt_late(phys_addr_t pa)
+static pmd_t *__meminit get_pmd_virt_late(phys_addr_t pa)
{
return (pmd_t *) __va(pa);
}
@@ -457,7 +456,7 @@ static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va)
return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
}

-static phys_addr_t __init alloc_pmd_late(uintptr_t va)
+static phys_addr_t __meminit alloc_pmd_late(uintptr_t va)
{
struct ptdesc *ptdesc = pagetable_alloc(GFP_KERNEL & ~__GFP_HIGHMEM, 0);

@@ -465,9 +464,9 @@ static phys_addr_t __init alloc_pmd_late(uintptr_t va)
return __pa((pmd_t *)ptdesc_address(ptdesc));
}

-static void __init create_pmd_mapping(pmd_t *pmdp,
- uintptr_t va, phys_addr_t pa,
- phys_addr_t sz, pgprot_t prot)
+static void __meminit create_pmd_mapping(pmd_t *pmdp,
+ uintptr_t va, phys_addr_t pa,
+ phys_addr_t sz, pgprot_t prot)
{
pte_t *ptep;
phys_addr_t pte_phys;
@@ -503,7 +502,7 @@ static pud_t *__init get_pud_virt_fixmap(phys_addr_t pa)
return (pud_t *)set_fixmap_offset(FIX_PUD, pa);
}

-static pud_t *__init get_pud_virt_late(phys_addr_t pa)
+static pud_t *__meminit get_pud_virt_late(phys_addr_t pa)
{
return (pud_t *)__va(pa);
}
@@ -521,7 +520,7 @@ static phys_addr_t __init alloc_pud_fixmap(uintptr_t va)
return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
}

-static phys_addr_t alloc_pud_late(uintptr_t va)
+static phys_addr_t __meminit alloc_pud_late(uintptr_t va)
{
unsigned long vaddr;

@@ -541,7 +540,7 @@ static p4d_t *__init get_p4d_virt_fixmap(phys_addr_t pa)
return (p4d_t *)set_fixmap_offset(FIX_P4D, pa);
}

-static p4d_t *__init get_p4d_virt_late(phys_addr_t pa)
+static p4d_t *__meminit get_p4d_virt_late(phys_addr_t pa)
{
return (p4d_t *)__va(pa);
}
@@ -559,7 +558,7 @@ static phys_addr_t __init alloc_p4d_fixmap(uintptr_t va)
return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
}

-static phys_addr_t alloc_p4d_late(uintptr_t va)
+static phys_addr_t __meminit alloc_p4d_late(uintptr_t va)
{
unsigned long vaddr;

@@ -568,9 +567,8 @@ static phys_addr_t alloc_p4d_late(uintptr_t va)
return __pa(vaddr);
}

-static void __init create_pud_mapping(pud_t *pudp,
- uintptr_t va, phys_addr_t pa,
- phys_addr_t sz, pgprot_t prot)
+static void __meminit create_pud_mapping(pud_t *pudp, uintptr_t va, phys_addr_t pa, phys_addr_t sz,
+ pgprot_t prot)
{
pmd_t *nextp;
phys_addr_t next_phys;
@@ -595,9 +593,8 @@ static void __init create_pud_mapping(pud_t *pudp,
create_pmd_mapping(nextp, va, pa, sz, prot);
}

-static void __init create_p4d_mapping(p4d_t *p4dp,
- uintptr_t va, phys_addr_t pa,
- phys_addr_t sz, pgprot_t prot)
+static void __meminit create_p4d_mapping(p4d_t *p4dp, uintptr_t va, phys_addr_t pa, phys_addr_t sz,
+ pgprot_t prot)
{
pud_t *nextp;
phys_addr_t next_phys;
@@ -653,9 +650,8 @@ static void __init create_p4d_mapping(p4d_t *p4dp,
#define create_pmd_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0)
#endif /* __PAGETABLE_PMD_FOLDED */

-void __init create_pgd_mapping(pgd_t *pgdp,
- uintptr_t va, phys_addr_t pa,
- phys_addr_t sz, pgprot_t prot)
+void __meminit create_pgd_mapping(pgd_t *pgdp, uintptr_t va, phys_addr_t pa, phys_addr_t sz,
+ pgprot_t prot)
{
pgd_next_t *nextp;
phys_addr_t next_phys;
@@ -680,8 +676,7 @@ void __init create_pgd_mapping(pgd_t *pgdp,
create_pgd_next_mapping(nextp, va, pa, sz, prot);
}

-static uintptr_t __init best_map_size(phys_addr_t pa, uintptr_t va,
- phys_addr_t size)
+static uintptr_t __meminit best_map_size(phys_addr_t pa, uintptr_t va, phys_addr_t size)
{
if (pgtable_l5_enabled &&
!(pa & (P4D_SIZE - 1)) && !(va & (P4D_SIZE - 1)) && size >= P4D_SIZE)
@@ -714,7 +709,7 @@ asmlinkage void __init __copy_data(void)
#endif

#ifdef CONFIG_STRICT_KERNEL_RWX
-static __init pgprot_t pgprot_from_va(uintptr_t va)
+static __meminit pgprot_t pgprot_from_va(uintptr_t va)
{
if (is_va_kernel_text(va))
return PAGE_KERNEL_READ_EXEC;
@@ -739,7 +734,7 @@ void mark_rodata_ro(void)
set_memory_ro);
}
#else
-static __init pgprot_t pgprot_from_va(uintptr_t va)
+static __meminit pgprot_t pgprot_from_va(uintptr_t va)
{
if (IS_ENABLED(CONFIG_64BIT) && !is_kernel_mapping(va))
return PAGE_KERNEL;
@@ -1231,9 +1226,8 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa)
pt_ops_set_fixmap();
}

-static void __init create_linear_mapping_range(phys_addr_t start,
- phys_addr_t end,
- uintptr_t fixed_map_size)
+static void __meminit create_linear_mapping_range(phys_addr_t start, phys_addr_t end,
+ uintptr_t fixed_map_size)
{
phys_addr_t pa;
uintptr_t va, map_size;
--
2.40.1