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From: Andrew Morton <akpm@linux-foundation.org>
To: benh@kernel.crashing.org, bhe@redhat.com, david@redhat.com,
	mhocko@suse.com, mm-commits@vger.kernel.org, mpe@ellerman.id.au,
	osalvador@suse.de, richard.weiyang@gmail.com
Subject: + mm-memory_hotplug-remove-is_mem_section_removable.patch added to -mm tree
Date: Mon, 13 Apr 2020 19:06:50 -0700
Message-ID: <20200414020650.aUjq25bvC%akpm@linux-foundation.org> (raw)
In-Reply-To: <20200412004155.1a8f4e081b4e03ef5903abb5@linux-foundation.org>


The patch titled
     Subject: mm/memory_hotplug: remove is_mem_section_removable()
has been added to the -mm tree.  Its filename is
     mm-memory_hotplug-remove-is_mem_section_removable.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/mm-memory_hotplug-remove-is_mem_section_removable.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/mm-memory_hotplug-remove-is_mem_section_removable.patch

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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next and is updated
there every 3-4 working days

------------------------------------------------------
From: David Hildenbrand <david@redhat.com>
Subject: mm/memory_hotplug: remove is_mem_section_removable()

Fortunately, all users of is_mem_section_removable() are gone.  Get rid of
it, including some now unnecessary functions.

Link: http://lkml.kernel.org/r/20200407135416.24093-3-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Wei Yang <richard.weiyang@gmail.com>
Reviewed-by: Baoquan He <bhe@redhat.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Oscar Salvador <osalvador@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/memory_hotplug.h |    7 --
 mm/memory_hotplug.c            |   75 -------------------------------
 2 files changed, 82 deletions(-)

--- a/include/linux/memory_hotplug.h~mm-memory_hotplug-remove-is_mem_section_removable
+++ a/include/linux/memory_hotplug.h
@@ -314,19 +314,12 @@ static inline void pgdat_resize_init(str
 
 #ifdef CONFIG_MEMORY_HOTREMOVE
 
-extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
 extern void try_offline_node(int nid);
 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
 extern int remove_memory(int nid, u64 start, u64 size);
 extern void __remove_memory(int nid, u64 start, u64 size);
 
 #else
-static inline bool is_mem_section_removable(unsigned long pfn,
-					unsigned long nr_pages)
-{
-	return false;
-}
-
 static inline void try_offline_node(int nid) {}
 
 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
--- a/mm/memory_hotplug.c~mm-memory_hotplug-remove-is_mem_section_removable
+++ a/mm/memory_hotplug.c
@@ -1109,81 +1109,6 @@ EXPORT_SYMBOL_GPL(add_memory);
 
 #ifdef CONFIG_MEMORY_HOTREMOVE
 /*
- * A free page on the buddy free lists (not the per-cpu lists) has PageBuddy
- * set and the size of the free page is given by page_order(). Using this,
- * the function determines if the pageblock contains only free pages.
- * Due to buddy contraints, a free page at least the size of a pageblock will
- * be located at the start of the pageblock
- */
-static inline int pageblock_free(struct page *page)
-{
-	return PageBuddy(page) && page_order(page) >= pageblock_order;
-}
-
-/* Return the pfn of the start of the next active pageblock after a given pfn */
-static unsigned long next_active_pageblock(unsigned long pfn)
-{
-	struct page *page = pfn_to_page(pfn);
-
-	/* Ensure the starting page is pageblock-aligned */
-	BUG_ON(pfn & (pageblock_nr_pages - 1));
-
-	/* If the entire pageblock is free, move to the end of free page */
-	if (pageblock_free(page)) {
-		int order;
-		/* be careful. we don't have locks, page_order can be changed.*/
-		order = page_order(page);
-		if ((order < MAX_ORDER) && (order >= pageblock_order))
-			return pfn + (1 << order);
-	}
-
-	return pfn + pageblock_nr_pages;
-}
-
-static bool is_pageblock_removable_nolock(unsigned long pfn)
-{
-	struct page *page = pfn_to_page(pfn);
-	struct zone *zone;
-
-	/*
-	 * We have to be careful here because we are iterating over memory
-	 * sections which are not zone aware so we might end up outside of
-	 * the zone but still within the section.
-	 * We have to take care about the node as well. If the node is offline
-	 * its NODE_DATA will be NULL - see page_zone.
-	 */
-	if (!node_online(page_to_nid(page)))
-		return false;
-
-	zone = page_zone(page);
-	pfn = page_to_pfn(page);
-	if (!zone_spans_pfn(zone, pfn))
-		return false;
-
-	return !has_unmovable_pages(zone, page, MIGRATE_MOVABLE,
-				    MEMORY_OFFLINE);
-}
-
-/* Checks if this range of memory is likely to be hot-removable. */
-bool is_mem_section_removable(unsigned long start_pfn, unsigned long nr_pages)
-{
-	unsigned long end_pfn, pfn;
-
-	end_pfn = min(start_pfn + nr_pages,
-			zone_end_pfn(page_zone(pfn_to_page(start_pfn))));
-
-	/* Check the starting page of each pageblock within the range */
-	for (pfn = start_pfn; pfn < end_pfn; pfn = next_active_pageblock(pfn)) {
-		if (!is_pageblock_removable_nolock(pfn))
-			return false;
-		cond_resched();
-	}
-
-	/* All pageblocks in the memory block are likely to be hot-removable */
-	return true;
-}

  parent reply index

Thread overview: 140+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-12  7:41 incoming Andrew Morton
2020-04-12  7:42 ` [patch 1/1] mm/debug: add tests validating architecture page table helpers Andrew Morton
2020-04-13 20:01 ` + mm-userfaultfd-disable-userfaultfd-wp-on-x86_32.patch added to -mm tree Andrew Morton
2020-04-13 20:08 ` + maintainers-add-an-entry-for-kfifo-fix.patch " Andrew Morton
2020-04-13 20:11 ` + m68k-drop-redundant-generic-y-=-hardirqh.patch " Andrew Morton
2020-04-13 20:12 ` + userc-make-uidhash_table-static.patch " Andrew Morton
2020-04-13 20:34 ` + sh-fix-build-error-in-mm-initc.patch " Andrew Morton
2020-04-13 20:51 ` + mm-hugetlb-fix-a-addressing-exception-caused-by-huge_pte_offset.patch " Andrew Morton
2020-04-13 21:16 ` + checkpatch-additional-maintainer-section-entry-ordering-checks.patch " Andrew Morton
2020-04-13 22:27 ` + fat-improve-the-readahead-for-fat-entries.patch " Andrew Morton
2020-04-13 22:32 ` + mm-swapfile-use-list_prevnext_entry-instead-of-open-coding.patch " Andrew Morton
2020-04-13 22:33 ` + mm-replace-zero-length-array-with-flexible-array-member.patch " Andrew Morton
2020-04-13 22:36 ` + mm-vmsan-fix-some-typos-in-comment.patch " Andrew Morton
2020-04-13 22:38 ` + mm-compaction-fix-a-typo-in-comment-pessemistic-pessimistic.patch " Andrew Morton
2020-04-13 22:38 ` + mm-memblock-fix-a-typo-in-comment-implict-implicit.patch " Andrew Morton
2020-04-13 22:38 ` + mm-list_lru-fix-a-typo-in-comment-numbesr-numbers.patch " Andrew Morton
2020-04-13 22:50 ` + mm-filemap-fix-a-typo-in-comment-unneccssary-unnecessary.patch " Andrew Morton
2020-04-13 22:51 ` + mm-frontswap-fix-some-typos-in-frontswapc.patch " Andrew Morton
2020-04-13 22:51 ` + mm-memcg-fix-some-typos-in-memcontrolc.patch " Andrew Morton
2020-04-13 22:51 ` + mm-fix-a-typo-in-comment-strucure-structure.patch " Andrew Morton
2020-04-13 23:07 ` + mm-slub-fix-a-typo-in-comment-disambiguiation-disambiguation.patch " Andrew Morton
2020-04-13 23:07 ` + mm-sparse-fix-a-typo-in-comment-convienence-convenience.patch " Andrew Morton
2020-04-13 23:07 ` + mm-page-writeback-fix-a-typo-in-comment-effictive-effective.patch " Andrew Morton
2020-04-13 23:07 ` + mm-memory-fix-a-typo-in-comment-attampt-attempt.patch " Andrew Morton
2020-04-14  0:25 ` + mm-memblock-replace-dereferences-of-memblock_regionnid-with-api-calls.patch " Andrew Morton
2020-04-14  0:25 ` + mm-make-early_pfn_to_nid-and-related-defintions-close-to-each-other.patch " Andrew Morton
2020-04-14  0:25 ` + mm-remove-config_have_memblock_node_map-option.patch " Andrew Morton
2020-04-14  0:25 ` + mm-free_area_init-use-maximal-zone-pfns-rather-than-zone-sizes.patch " Andrew Morton
2020-04-14  0:25 ` + mm-use-free_area_init-instead-of-free_area_init_nodes.patch " Andrew Morton
2020-04-14  0:26 ` + alpha-simplify-detection-of-memory-zone-boundaries.patch " Andrew Morton
2020-04-14  0:26 ` + arm-simplify-detection-of-memory-zone-boundaries.patch " Andrew Morton
2020-04-14  0:26 ` + arm64-simplify-detection-of-memory-zone-boundaries-for-uma-configs.patch " Andrew Morton
2020-04-14  0:26 ` + csky-simplify-detection-of-memory-zone-boundaries.patch " Andrew Morton
2020-04-14  0:26 ` + m68k-mm-simplify-detection-of-memory-zone-boundaries.patch " Andrew Morton
2020-04-14  0:26 ` + parisc-simplify-detection-of-memory-zone-boundaries.patch " Andrew Morton
2020-04-14  0:26 ` + sparc32-simplify-detection-of-memory-zone-boundaries.patch " Andrew Morton
2020-04-14  0:26 ` + unicore32-simplify-detection-of-memory-zone-boundaries.patch " Andrew Morton
2020-04-14  0:26 ` + xtensa-simplify-detection-of-memory-zone-boundaries.patch " Andrew Morton
2020-04-14  0:26 ` + mm-memmap_init-iterate-over-memblock-regions-rather-that-check-each-pfn.patch " Andrew Morton
2020-04-14  0:26 ` + mm-remove-early_pfn_in_nid-and-config_nodes_span_other_nodes.patch " Andrew Morton
2020-04-14  0:26 ` + mm-free_area_init-allow-defining-max_zone_pfn-in-descending-order.patch " Andrew Morton
2020-04-14  0:26 ` + mm-rename-free_area_init_node-to-free_area_init_memoryless_node.patch " Andrew Morton
2020-04-14  0:26 ` + mm-clean-up-free_area_init_node-and-its-helpers.patch " Andrew Morton
2020-04-14  0:26 ` + mm-simplify-find_min_pfn_with_active_regions.patch " Andrew Morton
2020-04-14  0:27 ` + docs-vm-update-memory-models-documentation.patch " Andrew Morton
2020-04-14  0:40 ` + mm-page_allocc-bad_-is-not-necessary-when-pagehwpoison.patch " Andrew Morton
2020-04-14  0:40 ` + mm-page_allocc-bad_flags-is-not-necessary-for-bad_page.patch " Andrew Morton
2020-04-14  0:40 ` + mm-page_allocc-rename-free_pages_check_bad-to-check_free_page_bad.patch " Andrew Morton
2020-04-14  0:40 ` + mm-page_allocc-rename-free_pages_check-to-check_free_page.patch " Andrew Morton
2020-04-14  0:40 ` + mm-page_allocc-extract-check__page_bad-common-part-to-page_bad_reason.patch " Andrew Morton
2020-04-14  0:52 ` + dynamic_debug-add-an-option-to-enable-dynamic-debug-for-modules-only.patch " Andrew Morton
2020-04-14  1:09 ` + mm-gup-return-eintr-when-gup-is-interrupted-by-fatal-signals.patch " Andrew Morton
2020-04-14  1:37 ` + squashfs-squashfs_fsh-replace-zero-length-array-with-flexible-array-member.patch " Andrew Morton
2020-04-14  1:37 ` + squashfs-migrate-from-ll_rw_block-usage-to-bio.patch " Andrew Morton
2020-04-14  1:39 ` + checkpatch-fix-a-typo-in-the-regex-for-allocfunctions.patch " Andrew Morton
2020-04-14  2:06 ` + powerpc-pseries-hotplug-memory-stop-checking-is_mem_section_removable.patch " Andrew Morton
2020-04-14  2:06 ` Andrew Morton [this message]
2020-04-14  2:13 ` [folded-merged] mm-clarify-__gfp_memalloc-usage-update.patch removed from " Andrew Morton
2020-04-14  2:13 ` [folded-merged] mm-clarify-__gfp_memalloc-usage-update-checkpatch-fixes.patch " Andrew Morton
2020-04-14 22:30 ` + maintainers-add-an-entry-for-kfifo-fix-fix.patch added to " Andrew Morton
2020-04-14 23:10 ` + mm-hugetlb-fix-a-typo-in-comment-manitained-maintained-v2.patch " Andrew Morton
2020-04-14 23:11 ` + mm-hugetlb-fix-a-typo-in-comment-manitained-maintained-v2-checkpatch-fixes.patch " Andrew Morton
2020-04-14 23:11 ` + mm-ksm-fix-a-typo-in-comment-alreaady-already-v2.patch " Andrew Morton
2020-04-14 23:56 ` + lib-add-might_fault-to-strncpy_from_user.patch " Andrew Morton
2020-04-15  0:00 ` + tools-build-tweak-unused-value-workaround.patch " Andrew Morton
2020-04-15  0:39 ` + h8300-remove-usage-of-__arch_use_5level_hack.patch " Andrew Morton
2020-04-15  0:39 ` + arm-add-support-for-folded-p4d-page-tables.patch " Andrew Morton
2020-04-15  0:39 ` + arm64-add-support-for-folded-p4d-page-tables.patch " Andrew Morton
2020-04-15  0:39 ` + hexagon-remove-__arch_use_5level_hack.patch " Andrew Morton
2020-04-15  0:39 ` + ia64-add-support-for-folded-p4d-page-tables.patch " Andrew Morton
2020-04-15  0:39 ` + nios2-add-support-for-folded-p4d-page-tables.patch " Andrew Morton
2020-04-15  0:40 ` + openrisc-add-support-for-folded-p4d-page-tables.patch " Andrew Morton
2020-04-15  0:40 ` + powerpc-add-support-for-folded-p4d-page-tables.patch " Andrew Morton
2020-04-15  0:40 ` + sh-fault-modernize-printing-of-kernel-messages.patch " Andrew Morton
2020-04-15  0:40 ` + sh-drop-__pxd_offset-macros-that-duplicate-pxd_index-ones.patch " Andrew Morton
2020-04-15  0:40 ` + sh-add-support-for-folded-p4d-page-tables.patch " Andrew Morton
2020-04-15  0:40 ` + unicore32-remove-__arch_use_5level_hack.patch " Andrew Morton
2020-04-15  0:40 ` + asm-generic-remove-pgtable-nop4d-hackh.patch " Andrew Morton
2020-04-15  0:40 ` + mm-remove-__arch_has_5level_hack-and-include-asm-generic-5level-fixuph.patch " Andrew Morton
2020-04-15  1:17 ` + mm-move-readahead-prototypes-from-mmh.patch " Andrew Morton
2020-04-15  1:17 ` + mm-return-void-from-various-readahead-functions.patch " Andrew Morton
2020-04-15  1:17 ` + mm-ignore-return-value-of-readpages.patch " Andrew Morton
2020-04-15  1:17 ` + mm-move-readahead-nr_pages-check-into-read_pages.patch " Andrew Morton
2020-04-15  1:17 ` + mm-add-new-readahead_control-api.patch " Andrew Morton
2020-04-15  1:17 ` + mm-use-readahead_control-to-pass-arguments.patch " Andrew Morton
2020-04-15  1:17 ` + mm-rename-various-offset-parameters-to-index.patch " Andrew Morton
2020-04-15  1:17 ` + mm-rename-readahead-loop-variable-to-i.patch " Andrew Morton
2020-04-15  1:17 ` + mm-remove-page_offset-from-readahead-loop.patch " Andrew Morton
2020-04-15  1:17 ` + mm-put-readahead-pages-in-cache-earlier.patch " Andrew Morton
2020-04-15  1:17 ` + mm-add-readahead-address-space-operation.patch " Andrew Morton
2020-04-15  1:17 ` + mm-move-end_index-check-out-of-readahead-loop.patch " Andrew Morton
2020-04-15  1:18 ` + mm-add-page_cache_readahead_unbounded.patch " Andrew Morton
2020-04-15  1:18 ` + mm-document-why-we-dont-set-pagereadahead.patch " Andrew Morton
2020-04-15  1:18 ` + mm-use-memalloc_nofs_save-in-readahead-path.patch " Andrew Morton
2020-04-15  1:18 ` + fs-convert-mpage_readpages-to-mpage_readahead.patch " Andrew Morton
2020-04-15  1:18 ` + btrfs-convert-from-readpages-to-readahead.patch " Andrew Morton
2020-04-15  1:18 ` + erofs-convert-uncompressed-files-from-readpages-to-readahead.patch " Andrew Morton
2020-04-15  1:18 ` + erofs-convert-compressed-files-from-readpages-to-readahead.patch " Andrew Morton
2020-04-15  1:18 ` + ext4-convert-from-readpages-to-readahead.patch " Andrew Morton
2020-04-15  1:18 ` + ext4-pass-the-inode-to-ext4_mpage_readpages.patch " Andrew Morton
2020-04-15  1:18 ` + f2fs-convert-from-readpages-to-readahead.patch " Andrew Morton
2020-04-15  1:18 ` + f2fs-pass-the-inode-to-f2fs_mpage_readpages.patch " Andrew Morton
2020-04-15  1:18 ` + fuse-convert-from-readpages-to-readahead.patch " Andrew Morton
2020-04-15  1:18 ` + iomap-convert-from-readpages-to-readahead.patch " Andrew Morton
2020-04-15  1:54 ` + mm-ksm-fix-null-pointer-dereference-when-ksm-zero-page-is-enabled.patch " Andrew Morton
     [not found]   ` <49e65ca7-03a2-9a82-9e1a-cf997320bcfd@virtuozzo.com>
     [not found]     ` <CAMZfGtWwE_9uSH9Vw+W2yJJhMo4BfWHx_PME+HD5h3r+A3zXeg@mail.gmail.com>
2020-04-15 18:32       ` [External] " Andrew Morton
2020-04-15  4:29 ` + mm-gupc-further-document-vma_permits_fault.patch " Andrew Morton
2020-04-15  4:33 ` + fuse-convert-from-readpages-to-readahead-fix.patch " Andrew Morton
2020-04-15  4:46 ` + x86-hyperv-use-vmalloc_exec-for-the-hypercall-page.patch " Andrew Morton
2020-04-15  4:46 ` + x86-fix-vmap-arguments-in-map_irq_stack.patch " Andrew Morton
2020-04-15  4:46 ` + staging-android-ion-use-vmap-instead-of-vm_map_ram.patch " Andrew Morton
2020-04-15  4:46 ` + staging-media-ipu3-use-vmap-instead-of-reimplementing-it.patch " Andrew Morton
2020-04-15  4:46 ` + dma-mapping-use-vmap-insted-of-reimplementing-it.patch " Andrew Morton
2020-04-15  4:46 ` + powerpc-add-an-ioremap_phb-helper.patch " Andrew Morton
2020-04-15  4:46 ` + powerpc-remove-__ioremap_at-and-__iounmap_at.patch " Andrew Morton
2020-04-15  4:47 ` + mm-remove-__get_vm_area.patch " Andrew Morton
2020-04-15  4:47 ` + mm-unexport-unmap_kernel_range_noflush.patch " Andrew Morton
2020-04-15  4:47 ` + mm-rename-config_pgtable_mapping-to-config_zsmalloc_pgtable_mapping.patch " Andrew Morton
2020-04-15  4:47 ` + mm-only-allow-page-table-mappings-for-built-in-zsmalloc.patch " Andrew Morton
2020-04-15  4:47 ` + mm-pass-addr-as-unsigned-long-to-vb_free.patch " Andrew Morton
2020-04-15  4:47 ` + mm-remove-vmap_page_range_noflush-and-vunmap_page_range.patch " Andrew Morton
2020-04-15  4:47 ` + mm-rename-vmap_page_range-to-map_kernel_range.patch " Andrew Morton
2020-04-15  4:47 ` + mm-dont-return-the-number-of-pages-from-map_kernel_range_noflush.patch " Andrew Morton
2020-04-15  4:47 ` + mm-remove-map_vm_range.patch " Andrew Morton
2020-04-15  4:47 ` + mm-remove-unmap_vmap_area.patch " Andrew Morton
2020-04-15  4:47 ` + mm-remove-the-prot-argument-from-vm_map_ram.patch " Andrew Morton
2020-04-15  4:47 ` + mm-enforce-that-vmap-cant-map-pages-executable.patch " Andrew Morton
2020-04-15  4:47 ` + gpu-drm-remove-the-powerpc-hack-in-drm_legacy_sg_alloc.patch " Andrew Morton
2020-04-15  4:47 ` + mm-remove-the-pgprot-argument-to-__vmalloc.patch " Andrew Morton
2020-04-15  4:48 ` + mm-remove-the-prot-argument-to-__vmalloc_node.patch " Andrew Morton
2020-04-15  4:48 ` + mm-remove-both-instances-of-__vmalloc_node_flags.patch " Andrew Morton
2020-04-15  4:48 ` + mm-remove-__vmalloc_node_flags_caller.patch " Andrew Morton
2020-04-15  4:48 ` + mm-switch-the-test_vmalloc-module-to-use-__vmalloc_node.patch " Andrew Morton
2020-04-15  4:48 ` + mm-remove-vmalloc_user_node_flags.patch " Andrew Morton
2020-04-15  4:48 ` + arm64-use-__vmalloc_node-in-arch_alloc_vmap_stack.patch " Andrew Morton
2020-04-15  4:48 ` + powerpc-use-__vmalloc_node-in-alloc_vm_stack.patch " Andrew Morton
2020-04-15  4:48 ` + s390-use-__vmalloc_node-in-stack_alloc.patch " Andrew Morton
2020-04-15 17:44 ` + test_firmware-remove-unnecessary-test_fw_mutex-in-test_dev_config_show_xxx.patch " Andrew Morton
2020-04-15 18:12 ` + slub-avoid-redzone-when-choosing-freepointer-location.patch " Andrew Morton
2020-04-15 18:41 ` + mm-shmem-fix-build-without-thp.patch " Andrew Morton

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