add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/nios2/mm/init.c
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@@ -23,13 +23,12 @@
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 #include <linux/mm.h>
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 #include <linux/init.h>
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 #include <linux/pagemap.h>
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-#include <linux/bootmem.h>
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+#include <linux/memblock.h>
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 #include <linux/slab.h>
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 #include <linux/binfmts.h>
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 #include <asm/setup.h>
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 #include <asm/page.h>
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-#include <asm/pgtable.h>
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 #include <asm/sections.h>
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 #include <asm/tlb.h>
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 #include <asm/mmu_context.h>
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@@ -46,17 +45,15 @@
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  */
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 void __init paging_init(void)
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 {
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-	unsigned long zones_size[MAX_NR_ZONES];
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-
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-	memset(zones_size, 0, sizeof(zones_size));
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+	unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0 };
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 	pagetable_init();
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 	pgd_current = swapper_pg_dir;
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-	zones_size[ZONE_NORMAL] = max_mapnr;
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+	max_zone_pfn[ZONE_NORMAL] = max_mapnr;
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 	/* pass the memory from the bootmem allocator to the main allocator */
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-	free_area_init(zones_size);
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+	free_area_init(max_zone_pfn);
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 	flush_dcache_range((unsigned long)empty_zero_page,
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 			(unsigned long)empty_zero_page + PAGE_SIZE);
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@@ -73,25 +70,13 @@
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 	high_memory = __va(end_mem);
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 	/* this will put all memory onto the freelists */
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-	free_all_bootmem();
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+	memblock_free_all();
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 	mem_init_print_info(NULL);
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 }
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 void __init mmu_init(void)
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 {
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 	flush_tlb_all();
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-}
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-
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-#ifdef CONFIG_BLK_DEV_INITRD
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-void __init free_initrd_mem(unsigned long start, unsigned long end)
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-{
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-	free_reserved_area((void *)start, (void *)end, -1, "initrd");
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-}
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-#endif
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-
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-void __ref free_initmem(void)
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-{
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-	free_initmem_default(-1);
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 }
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 #define __page_aligned(order) __aligned(PAGE_SIZE << (order))
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@@ -124,14 +109,14 @@
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 	struct mm_struct *mm = current->mm;
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 	int ret;
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-	down_write(&mm->mmap_sem);
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+	mmap_write_lock(mm);
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 	/* Map kuser helpers to user space address */
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 	ret = install_special_mapping(mm, KUSER_BASE, KUSER_SIZE,
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 				      VM_READ | VM_EXEC | VM_MAYREAD |
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 				      VM_MAYEXEC, kuser_page);
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-	up_write(&mm->mmap_sem);
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+	mmap_write_unlock(mm);
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 	return ret;
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 }