No functional change, but the only purpose of the offlining argument to migrate_pages() etc, was to ensure that __unmap_and_move() could migrate a KSM page for memory hotremove (which took ksm_thread_mutex) but not for other callers. Now all cases are safe, remove the arg. Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx> --- include/linux/migrate.h | 14 ++++++-------- mm/compaction.c | 2 +- mm/memory-failure.c | 7 +++---- mm/memory_hotplug.c | 3 +-- mm/mempolicy.c | 8 +++----- mm/migrate.c | 35 +++++++++++++---------------------- mm/page_alloc.c | 6 ++---- 7 files changed, 29 insertions(+), 46 deletions(-) --- mmotm.orig/include/linux/migrate.h 2013-01-24 12:28:38.740127550 -0800 +++ mmotm/include/linux/migrate.h 2013-01-25 14:38:51.468208776 -0800 @@ -40,11 +40,9 @@ extern void putback_movable_pages(struct extern int migrate_page(struct address_space *, struct page *, struct page *, enum migrate_mode); extern int migrate_pages(struct list_head *l, new_page_t x, - unsigned long private, bool offlining, - enum migrate_mode mode, int reason); + unsigned long private, enum migrate_mode mode, int reason); extern int migrate_huge_page(struct page *, new_page_t x, - unsigned long private, bool offlining, - enum migrate_mode mode); + unsigned long private, enum migrate_mode mode); extern int fail_migrate_page(struct address_space *, struct page *, struct page *); @@ -62,11 +60,11 @@ extern int migrate_huge_page_move_mappin static inline void putback_lru_pages(struct list_head *l) {} static inline void putback_movable_pages(struct list_head *l) {} static inline int migrate_pages(struct list_head *l, new_page_t x, - unsigned long private, bool offlining, - enum migrate_mode mode, int reason) { return -ENOSYS; } + unsigned long private, enum migrate_mode mode, int reason) + { return -ENOSYS; } static inline int migrate_huge_page(struct page *page, new_page_t x, - unsigned long private, bool offlining, - enum migrate_mode mode) { return -ENOSYS; } + unsigned long private, enum migrate_mode mode) + { return -ENOSYS; } static inline int migrate_prep(void) { return -ENOSYS; } static inline int migrate_prep_local(void) { return -ENOSYS; } --- mmotm.orig/mm/compaction.c 2013-01-24 12:28:38.740127550 -0800 +++ mmotm/mm/compaction.c 2013-01-25 14:38:51.472208776 -0800 @@ -980,7 +980,7 @@ static int compact_zone(struct zone *zon nr_migrate = cc->nr_migratepages; err = migrate_pages(&cc->migratepages, compaction_alloc, - (unsigned long)cc, false, + (unsigned long)cc, cc->sync ? MIGRATE_SYNC_LIGHT : MIGRATE_ASYNC, MR_COMPACTION); update_nr_listpages(cc); --- mmotm.orig/mm/memory-failure.c 2013-01-24 12:28:38.740127550 -0800 +++ mmotm/mm/memory-failure.c 2013-01-25 14:38:51.472208776 -0800 @@ -1432,7 +1432,7 @@ static int soft_offline_huge_page(struct goto done; /* Keep page count to indicate a given hugepage is isolated. */ - ret = migrate_huge_page(hpage, new_page, MPOL_MF_MOVE_ALL, false, + ret = migrate_huge_page(hpage, new_page, MPOL_MF_MOVE_ALL, MIGRATE_SYNC); put_page(hpage); if (ret) { @@ -1564,11 +1564,10 @@ int soft_offline_page(struct page *page, if (!ret) { LIST_HEAD(pagelist); inc_zone_page_state(page, NR_ISOLATED_ANON + - page_is_file_cache(page)); + page_is_file_cache(page)); list_add(&page->lru, &pagelist); ret = migrate_pages(&pagelist, new_page, MPOL_MF_MOVE_ALL, - false, MIGRATE_SYNC, - MR_MEMORY_FAILURE); + MIGRATE_SYNC, MR_MEMORY_FAILURE); if (ret) { putback_lru_pages(&pagelist); pr_info("soft offline: %#lx: migration failed %d, type %lx\n", --- mmotm.orig/mm/memory_hotplug.c 2013-01-24 12:28:38.740127550 -0800 +++ mmotm/mm/memory_hotplug.c 2013-01-25 14:38:51.472208776 -0800 @@ -1283,8 +1283,7 @@ do_migrate_range(unsigned long start_pfn * migrate_pages returns # of failed pages. */ ret = migrate_pages(&source, alloc_migrate_target, 0, - true, MIGRATE_SYNC, - MR_MEMORY_HOTPLUG); + MIGRATE_SYNC, MR_MEMORY_HOTPLUG); if (ret) putback_lru_pages(&source); } --- mmotm.orig/mm/mempolicy.c 2013-01-25 14:38:49.596208731 -0800 +++ mmotm/mm/mempolicy.c 2013-01-25 14:38:51.472208776 -0800 @@ -1014,8 +1014,7 @@ static int migrate_to_node(struct mm_str if (!list_empty(&pagelist)) { err = migrate_pages(&pagelist, new_node_page, dest, - false, MIGRATE_SYNC, - MR_SYSCALL); + MIGRATE_SYNC, MR_SYSCALL); if (err) putback_lru_pages(&pagelist); } @@ -1259,9 +1258,8 @@ static long do_mbind(unsigned long start if (!list_empty(&pagelist)) { WARN_ON_ONCE(flags & MPOL_MF_LAZY); nr_failed = migrate_pages(&pagelist, new_vma_page, - (unsigned long)vma, - false, MIGRATE_SYNC, - MR_MEMPOLICY_MBIND); + (unsigned long)vma, + MIGRATE_SYNC, MR_MEMPOLICY_MBIND); if (nr_failed) putback_lru_pages(&pagelist); } --- mmotm.orig/mm/migrate.c 2013-01-25 14:38:49.596208731 -0800 +++ mmotm/mm/migrate.c 2013-01-25 14:38:51.476208776 -0800 @@ -701,7 +701,7 @@ static int move_to_new_page(struct page } static int __unmap_and_move(struct page *page, struct page *newpage, - int force, bool offlining, enum migrate_mode mode) + int force, enum migrate_mode mode) { int rc = -EAGAIN; int remap_swapcache = 1; @@ -847,8 +847,7 @@ out: * to the newly allocated page in newpage. */ static int unmap_and_move(new_page_t get_new_page, unsigned long private, - struct page *page, int force, bool offlining, - enum migrate_mode mode) + struct page *page, int force, enum migrate_mode mode) { int rc = 0; int *result = NULL; @@ -866,7 +865,7 @@ static int unmap_and_move(new_page_t get if (unlikely(split_huge_page(page))) goto out; - rc = __unmap_and_move(page, newpage, force, offlining, mode); + rc = __unmap_and_move(page, newpage, force, mode); if (unlikely(rc == MIGRATEPAGE_BALLOON_SUCCESS)) { /* @@ -927,8 +926,7 @@ out: */ static int unmap_and_move_huge_page(new_page_t get_new_page, unsigned long private, struct page *hpage, - int force, bool offlining, - enum migrate_mode mode) + int force, enum migrate_mode mode) { int rc = 0; int *result = NULL; @@ -990,9 +988,8 @@ out: * * Return: Number of pages not migrated or error code. */ -int migrate_pages(struct list_head *from, - new_page_t get_new_page, unsigned long private, bool offlining, - enum migrate_mode mode, int reason) +int migrate_pages(struct list_head *from, new_page_t get_new_page, + unsigned long private, enum migrate_mode mode, int reason) { int retry = 1; int nr_failed = 0; @@ -1013,8 +1010,7 @@ int migrate_pages(struct list_head *from cond_resched(); rc = unmap_and_move(get_new_page, private, - page, pass > 2, offlining, - mode); + page, pass > 2, mode); switch(rc) { case -ENOMEM: @@ -1047,15 +1043,13 @@ out: } int migrate_huge_page(struct page *hpage, new_page_t get_new_page, - unsigned long private, bool offlining, - enum migrate_mode mode) + unsigned long private, enum migrate_mode mode) { int pass, rc; for (pass = 0; pass < 10; pass++) { - rc = unmap_and_move_huge_page(get_new_page, - private, hpage, pass > 2, offlining, - mode); + rc = unmap_and_move_huge_page(get_new_page, private, + hpage, pass > 2, mode); switch (rc) { case -ENOMEM: goto out; @@ -1178,8 +1172,7 @@ set_status: err = 0; if (!list_empty(&pagelist)) { err = migrate_pages(&pagelist, new_page_node, - (unsigned long)pm, 0, MIGRATE_SYNC, - MR_SYSCALL); + (unsigned long)pm, MIGRATE_SYNC, MR_SYSCALL); if (err) putback_lru_pages(&pagelist); } @@ -1614,10 +1607,8 @@ int migrate_misplaced_page(struct page * goto out; list_add(&page->lru, &migratepages); - nr_remaining = migrate_pages(&migratepages, - alloc_misplaced_dst_page, - node, false, MIGRATE_ASYNC, - MR_NUMA_MISPLACED); + nr_remaining = migrate_pages(&migratepages, alloc_misplaced_dst_page, + node, MIGRATE_ASYNC, MR_NUMA_MISPLACED); if (nr_remaining) { putback_lru_pages(&migratepages); isolated = 0; --- mmotm.orig/mm/page_alloc.c 2013-01-24 12:28:38.740127550 -0800 +++ mmotm/mm/page_alloc.c 2013-01-25 14:38:51.476208776 -0800 @@ -6064,10 +6064,8 @@ static int __alloc_contig_migrate_range( &cc->migratepages); cc->nr_migratepages -= nr_reclaimed; - ret = migrate_pages(&cc->migratepages, - alloc_migrate_target, - 0, false, MIGRATE_SYNC, - MR_CMA); + ret = migrate_pages(&cc->migratepages, alloc_migrate_target, + 0, MIGRATE_SYNC, MR_CMA); } if (ret < 0) { putback_movable_pages(&cc->migratepages); -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. 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