mm/page_ext: init page_ext early if there are no deferred struct pages
page_ext must be initialized after all struct pages are initialized. Therefore, page_ext is initialized after page_alloc_init_late(), and can optionally be initialized earlier via early_page_ext kernel parameter which as a side effect also disables deferred struct pages. Allow to automatically init page_ext early when there are no deferred struct pages in order to be able to use page_ext during kernel boot and track for example page allocations early. [pasha.tatashin@soleen.com: fix build with CONFIG_PAGE_EXTENSION=n] Link: https://lkml.kernel.org/r/20230118155251.2522985-1-pasha.tatashin@soleen.com Link: https://lkml.kernel.org/r/20230117204617.1553748-1-pasha.tatashin@soleen.com Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com> Acked-by: Mike Rapoport (IBM) <rppt@kernel.org> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Charan Teja Kalla <quic_charante@quicinc.com> Cc: David Hildenbrand <david@redhat.com> Cc: Li Zhe <lizhe.67@bytedance.com> Cc: Michal Hocko <mhocko@suse.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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@ -29,6 +29,8 @@ struct page_ext_operations {
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bool need_shared_flags;
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};
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extern bool deferred_struct_pages;
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#ifdef CONFIG_PAGE_EXTENSION
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/*
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@ -855,8 +855,8 @@ static void __init mm_init(void)
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pgtable_init();
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debug_objects_mem_init();
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vmalloc_init();
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/* Should be run after vmap initialization */
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if (early_page_ext_enabled())
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/* If no deferred init page_ext now, as vmap is fully initialized */
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if (!deferred_struct_pages)
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page_ext_init();
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/* Should be run before the first non-init thread is created */
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init_espfix_bsp();
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@ -1628,7 +1628,7 @@ static noinline void __init kernel_init_freeable(void)
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padata_init();
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page_alloc_init_late();
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/* Initialize page ext after all struct pages are initialized. */
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if (!early_page_ext_enabled())
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if (deferred_struct_pages)
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page_ext_init();
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do_basic_setup();
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@ -430,6 +430,8 @@ EXPORT_SYMBOL(nr_online_nodes);
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int page_group_by_mobility_disabled __read_mostly;
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bool deferred_struct_pages __meminitdata;
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#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
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/*
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* During boot we initialize deferred pages on-demand, as needed, but once
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@ -6803,9 +6805,11 @@ void __meminit memmap_init_range(unsigned long size, int nid, unsigned long zone
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if (context == MEMINIT_EARLY) {
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if (overlap_memmap_init(zone, &pfn))
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continue;
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if (defer_init(nid, pfn, zone_end_pfn))
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if (defer_init(nid, pfn, zone_end_pfn)) {
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deferred_struct_pages = true;
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break;
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}
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}
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page = pfn_to_page(pfn);
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__init_single_page(page, pfn, zone, nid);
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@ -92,7 +92,7 @@ unsigned long page_ext_size;
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static unsigned long total_usage;
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static struct page_ext *lookup_page_ext(const struct page *page);
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bool early_page_ext;
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bool early_page_ext __meminitdata;
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static int __init setup_early_page_ext(char *str)
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{
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early_page_ext = true;
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