add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/mm/page_idle.c
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@@ -1,9 +1,10 @@
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 // SPDX-License-Identifier: GPL-2.0
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 #include <linux/init.h>
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-#include <linux/bootmem.h>
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+#include <linux/memblock.h>
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 #include <linux/fs.h>
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 #include <linux/sysfs.h>
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 #include <linux/kobject.h>
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+#include <linux/memory_hotplug.h>
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 #include <linux/mm.h>
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 #include <linux/mmzone.h>
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 #include <linux/pagemap.h>
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@@ -30,24 +31,20 @@
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  */
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 static struct page *page_idle_get_page(unsigned long pfn)
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 {
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-	struct page *page;
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-	struct zone *zone;
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+	struct page *page = pfn_to_online_page(pfn);
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+	pg_data_t *pgdat;
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-	if (!pfn_valid(pfn))
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-		return NULL;
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-
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-	page = pfn_to_page(pfn);
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 	if (!page || !PageLRU(page) ||
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 	    !get_page_unless_zero(page))
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 		return NULL;
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-	zone = page_zone(page);
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-	spin_lock_irq(zone_lru_lock(zone));
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+	pgdat = page_pgdat(page);
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+	spin_lock_irq(&pgdat->lru_lock);
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 	if (unlikely(!PageLRU(page))) {
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 		put_page(page);
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 		page = NULL;
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 	}
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-	spin_unlock_irq(zone_lru_lock(zone));
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+	spin_unlock_irq(&pgdat->lru_lock);
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 	return page;
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 }
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@@ -95,10 +92,10 @@
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 static void page_idle_clear_pte_refs(struct page *page)
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 {
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 	/*
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-	 * Since rwc.arg is unused, rwc is effectively immutable, so we
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-	 * can make it static const to save some cycles and stack.
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+	 * Since rwc.try_lock is unused, rwc is effectively immutable, so we
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+	 * can make it static to save some cycles and stack.
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 	 */
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-	static const struct rmap_walk_control rwc = {
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+	static struct rmap_walk_control rwc = {
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 		.rmap_one = page_idle_clear_pte_refs_one,
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 		.anon_lock = page_lock_anon_vma_read,
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 	};
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@@ -213,16 +210,6 @@
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 	.bin_attrs = page_idle_bin_attrs,
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 	.name = "page_idle",
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 };
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-
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-#ifndef CONFIG_64BIT
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-static bool need_page_idle(void)
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-{
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-	return true;
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-}
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-struct page_ext_operations page_idle_ops = {
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-	.need = need_page_idle,
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-};
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-#endif
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 static int __init page_idle_init(void)
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 {