diff options
Diffstat (limited to 'sys-kernel/linux-sources-redcore/files/5.1-0001-uksm-apply-52d1e606ee733.patch')
| -rw-r--r-- | sys-kernel/linux-sources-redcore/files/5.1-0001-uksm-apply-52d1e606ee733.patch | 75 |
1 files changed, 0 insertions, 75 deletions
diff --git a/sys-kernel/linux-sources-redcore/files/5.1-0001-uksm-apply-52d1e606ee733.patch b/sys-kernel/linux-sources-redcore/files/5.1-0001-uksm-apply-52d1e606ee733.patch deleted file mode 100644 index dbc5357c..00000000 --- a/sys-kernel/linux-sources-redcore/files/5.1-0001-uksm-apply-52d1e606ee733.patch +++ /dev/null @@ -1,75 +0,0 @@ -From ea0c9d768bade0bc87046841a3e667f477d90668 Mon Sep 17 00:00:00 2001 -From: Oleksandr Natalenko <oleksandr@natalenko.name> -Date: Mon, 6 May 2019 22:02:49 +0200 -Subject: [PATCH] uksm-5.1: apply 52d1e606ee733 - -Signed-off-by: Oleksandr Natalenko <oleksandr@natalenko.name> ---- - mm/uksm.c | 36 +++++++++++++++++++++++++++++++----- - 1 file changed, 31 insertions(+), 5 deletions(-) - -diff --git a/mm/uksm.c b/mm/uksm.c -index 174e1921eade..2531599038b8 100644 ---- a/mm/uksm.c -+++ b/mm/uksm.c -@@ -875,8 +875,8 @@ static void remove_node_from_stable_tree(struct stable_node *stable_node, - * to keep the page_count protocol described with page_cache_get_speculative. - * - * Note: it is possible that get_uksm_page() will return NULL one moment, -- * then page the next, if the page is in between page_freeze_refs() and -- * page_unfreeze_refs(): this shouldn't be a problem anywhere, the page -+ * then page the next, if the page is in between page_ref_freeze() and -+ * page_ref_unfreeze(): this shouldn't be a problem anywhere, the page - * is on its way to being freed; but it is an anomaly to bear in mind. - * - * @unlink_rb: if the removal of this node will firstly unlink from -@@ -914,10 +914,11 @@ static struct page *get_uksm_page(struct stable_node *stable_node, - * We cannot do anything with the page while its refcount is 0. - * Usually 0 means free, or tail of a higher-order page: in which - * case this node is no longer referenced, and should be freed; -- * however, it might mean that the page is under page_freeze_refs(). -+ * however, it might mean that the page is under page_ref_freeze(). - * The __remove_mapping() case is easy, again the node is now stale; -- * but if page is swapcache in migrate_page_move_mapping(), it might -- * still be our page, in which case it's essential to keep the node. -+ * the same is in reuse_ksm_page() case; but if page is swapcache -+ * in migrate_page_move_mapping(), it might still be our page, -+ * in which case it's essential to keep the node. - */ - while (!get_page_unless_zero(page)) { - /* -@@ -4749,6 +4750,31 @@ void rmap_walk_ksm(struct page *page, struct rmap_walk_control *rwc) - goto again; - } - -+bool reuse_ksm_page(struct page *page, -+ struct vm_area_struct *vma, -+ unsigned long address) -+{ -+#ifdef CONFIG_DEBUG_VM -+ if (WARN_ON(is_zero_pfn(page_to_pfn(page))) || -+ WARN_ON(!page_mapped(page)) || -+ WARN_ON(!PageLocked(page))) { -+ dump_page(page, "reuse_ksm_page"); -+ return false; -+ } -+#endif -+ -+ if (PageSwapCache(page) || !page_stable_node(page)) -+ return false; -+ /* Prohibit parallel get_ksm_page() */ -+ if (!page_ref_freeze(page, 1)) -+ return false; -+ -+ page_move_anon_rmap(page, vma); -+ page->index = linear_page_index(vma, address); -+ page_ref_unfreeze(page, 1); -+ -+ return true; -+} - #ifdef CONFIG_MIGRATION - /* Common ksm interface but may be specific to uksm */ - void ksm_migrate_page(struct page *newpage, struct page *oldpage) --- -2.21.0.777.g83232e3864 - |