1 files changed, 115 insertions, 0 deletions
diff --git a/include/linux/oom.h b/include/linux/oom.h
new file mode 100644
index 000000000..7d0c9c48a
--- /dev/null
+++ b/include/linux/oom.h
@@ -0,0 +1,115 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __INCLUDE_LINUX_OOM_H
+#define __INCLUDE_LINUX_OOM_H
+
+
+#include <linux/sched/signal.h>
+#include <linux/types.h>
+#include <linux/nodemask.h>
+#include <uapi/linux/oom.h>
+#include <linux/sched/coredump.h> /* MMF_* */
+#include <linux/mm.h> /* VM_FAULT* */
+
+struct zonelist;
+struct notifier_block;
+struct mem_cgroup;
+struct task_struct;
+
+enum oom_constraint {
+	CONSTRAINT_NONE,
+	CONSTRAINT_CPUSET,
+	CONSTRAINT_MEMORY_POLICY,
+	CONSTRAINT_MEMCG,
+};
+
+/*
+ * Details of the page allocation that triggered the oom killer that are used to
+ * determine what should be killed.
+ */
+struct oom_control {
+	/* Used to determine cpuset */
+	struct zonelist *zonelist;
+
+	/* Used to determine mempolicy */
+	nodemask_t *nodemask;
+
+	/* Memory cgroup in which oom is invoked, or NULL for global oom */
+	struct mem_cgroup *memcg;
+
+	/* Used to determine cpuset and node locality requirement */
+	const gfp_t gfp_mask;
+
+	/*
+	 * order == -1 means the oom kill is required by sysrq, otherwise only
+	 * for display purposes.
+	 */
+	const int order;
+
+	/* Used by oom implementation, do not set */
+	unsigned long totalpages;
+	struct task_struct *chosen;
+	long chosen_points;
+
+	/* Used to print the constraint info. */
+	enum oom_constraint constraint;
+};
+
+extern struct mutex oom_lock;
+extern struct mutex oom_adj_mutex;
+
+static inline void set_current_oom_origin(void)
+{
+	current->signal->oom_flag_origin = true;
+}
+
+static inline void clear_current_oom_origin(void)
+{
+	current->signal->oom_flag_origin = false;
+}
+
+static inline bool oom_task_origin(const struct task_struct *p)
+{
+	return p->signal->oom_flag_origin;
+}
+
+static inline bool tsk_is_oom_victim(struct task_struct * tsk)
+{
+	return tsk->signal->oom_mm;
+}
+
+/*
+ * Checks whether a page fault on the given mm is still reliable.
+ * This is no longer true if the oom reaper started to reap the
+ * address space which is reflected by MMF_UNSTABLE flag set in
+ * the mm. At that moment any !shared mapping would lose the content
+ * and could cause a memory corruption (zero pages instead of the
+ * original content).
+ *
+ * User should call this before establishing a page table entry for
+ * a !shared mapping and under the proper page table lock.
+ *
+ * Return 0 when the PF is safe VM_FAULT_SIGBUS otherwise.
+ */
+static inline vm_fault_t check_stable_address_space(struct mm_struct *mm)
+{
+	if (unlikely(test_bit(MMF_UNSTABLE, &mm->flags)))
+		return VM_FAULT_SIGBUS;
+	return 0;
+}
+
+long oom_badness(struct task_struct *p,
+		unsigned long totalpages);
+
+extern bool out_of_memory(struct oom_control *oc);
+
+extern void exit_oom_victim(void);
+
+extern int register_oom_notifier(struct notifier_block *nb);
+extern int unregister_oom_notifier(struct notifier_block *nb);
+
+extern bool oom_killer_disable(signed long timeout);
+extern void oom_killer_enable(void);
+
+extern struct task_struct *find_lock_task_mm(struct task_struct *p);
+
+#endif /* _INCLUDE_LINUX_OOM_H */