Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/include/linux/stackleak.h b/include/linux/stackleak.h
new file mode 100644
index 0000000..3d5c327
--- /dev/null
+++ b/include/linux/stackleak.h
@@ -0,0 +1,35 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_STACKLEAK_H
+#define _LINUX_STACKLEAK_H
+
+#include <linux/sched.h>
+#include <linux/sched/task_stack.h>
+
+/*
+ * Check that the poison value points to the unused hole in the
+ * virtual memory map for your platform.
+ */
+#define STACKLEAK_POISON -0xBEEF
+#define STACKLEAK_SEARCH_DEPTH 128
+
+#ifdef CONFIG_GCC_PLUGIN_STACKLEAK
+#include <asm/stacktrace.h>
+
+static inline void stackleak_task_init(struct task_struct *t)
+{
+ t->lowest_stack = (unsigned long)end_of_stack(t) + sizeof(unsigned long);
+# ifdef CONFIG_STACKLEAK_METRICS
+ t->prev_lowest_stack = t->lowest_stack;
+# endif
+}
+
+#ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
+int stack_erasing_sysctl(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos);
+#endif
+
+#else /* !CONFIG_GCC_PLUGIN_STACKLEAK */
+static inline void stackleak_task_init(struct task_struct *t) { }
+#endif
+
+#endif