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authorKefeng Wang <wangkefeng.wang@huawei.com>2023-05-16 14:38:16 +0800
committerAndrew Morton <akpm@linux-foundation.org>2023-06-09 16:25:23 -0700
commit884c175f12ce1fabff18ac113349628149fc6cf2 (patch)
treeb0e0da0c27930669aba04ff376cec01b2bb9cbc0 /mm/debug_page_alloc.c
parent0866e82e40fba45dae07e6e8385929b574201752 (diff)
mm: page_alloc: split out DEBUG_PAGEALLOC
Move DEBUG_PAGEALLOC related functions into a single file to reduce a bit of page_alloc.c. Link: https://lkml.kernel.org/r/20230516063821.121844-9-wangkefeng.wang@huawei.com Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> Cc: David Hildenbrand <david@redhat.com> Cc: "Huang, Ying" <ying.huang@intel.com> Cc: Iurii Zaikin <yzaikin@google.com> Cc: Kees Cook <keescook@chromium.org> Cc: Len Brown <len.brown@intel.com> Cc: Luis Chamberlain <mcgrof@kernel.org> Cc: Mike Rapoport (IBM) <rppt@kernel.org> Cc: Oscar Salvador <osalvador@suse.de> Cc: Pavel Machek <pavel@ucw.cz> Cc: Rafael J. Wysocki <rafael@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/debug_page_alloc.c')
-rw-r--r--mm/debug_page_alloc.c59
1 files changed, 59 insertions, 0 deletions
diff --git a/mm/debug_page_alloc.c b/mm/debug_page_alloc.c
new file mode 100644
index 000000000000..f9d145730fd1
--- /dev/null
+++ b/mm/debug_page_alloc.c
@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/mm.h>
+#include <linux/page-isolation.h>
+
+unsigned int _debug_guardpage_minorder;
+
+bool _debug_pagealloc_enabled_early __read_mostly
+ = IS_ENABLED(CONFIG_DEBUG_PAGEALLOC_ENABLE_DEFAULT);
+EXPORT_SYMBOL(_debug_pagealloc_enabled_early);
+DEFINE_STATIC_KEY_FALSE(_debug_pagealloc_enabled);
+EXPORT_SYMBOL(_debug_pagealloc_enabled);
+
+DEFINE_STATIC_KEY_FALSE(_debug_guardpage_enabled);
+
+static int __init early_debug_pagealloc(char *buf)
+{
+ return kstrtobool(buf, &_debug_pagealloc_enabled_early);
+}
+early_param("debug_pagealloc", early_debug_pagealloc);
+
+static int __init debug_guardpage_minorder_setup(char *buf)
+{
+ unsigned long res;
+
+ if (kstrtoul(buf, 10, &res) < 0 || res > MAX_ORDER / 2) {
+ pr_err("Bad debug_guardpage_minorder value\n");
+ return 0;
+ }
+ _debug_guardpage_minorder = res;
+ pr_info("Setting debug_guardpage_minorder to %lu\n", res);
+ return 0;
+}
+early_param("debug_guardpage_minorder", debug_guardpage_minorder_setup);
+
+bool __set_page_guard(struct zone *zone, struct page *page, unsigned int order,
+ int migratetype)
+{
+ if (order >= debug_guardpage_minorder())
+ return false;
+
+ __SetPageGuard(page);
+ INIT_LIST_HEAD(&page->buddy_list);
+ set_page_private(page, order);
+ /* Guard pages are not available for any usage */
+ if (!is_migrate_isolate(migratetype))
+ __mod_zone_freepage_state(zone, -(1 << order), migratetype);
+
+ return true;
+}
+
+void __clear_page_guard(struct zone *zone, struct page *page, unsigned int order,
+ int migratetype)
+{
+ __ClearPageGuard(page);
+
+ set_page_private(page, 0);
+ if (!is_migrate_isolate(migratetype))
+ __mod_zone_freepage_state(zone, (1 << order), migratetype);
+}