v4.19.13 snapshot.
diff --git a/include/linux/thread_info.h b/include/linux/thread_info.h
new file mode 100644
index 0000000..8d8821b
--- /dev/null
+++ b/include/linux/thread_info.h
@@ -0,0 +1,160 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* thread_info.h: common low-level thread information accessors
+ *
+ * Copyright (C) 2002 David Howells (dhowells@redhat.com)
+ * - Incorporating suggestions made by Linus Torvalds
+ */
+
+#ifndef _LINUX_THREAD_INFO_H
+#define _LINUX_THREAD_INFO_H
+
+#include <linux/types.h>
+#include <linux/bug.h>
+#include <linux/restart_block.h>
+
+#ifdef CONFIG_THREAD_INFO_IN_TASK
+/*
+ * For CONFIG_THREAD_INFO_IN_TASK kernels we need <asm/current.h> for the
+ * definition of current, but for !CONFIG_THREAD_INFO_IN_TASK kernels,
+ * including <asm/current.h> can cause a circular dependency on some platforms.
+ */
+#include <asm/current.h>
+#define current_thread_info() ((struct thread_info *)current)
+#endif
+
+#include <linux/bitops.h>
+
+/*
+ * For per-arch arch_within_stack_frames() implementations, defined in
+ * asm/thread_info.h.
+ */
+enum {
+ BAD_STACK = -1,
+ NOT_STACK = 0,
+ GOOD_FRAME,
+ GOOD_STACK,
+};
+
+#include <asm/thread_info.h>
+
+#ifdef __KERNEL__
+
+#ifndef THREAD_ALIGN
+#define THREAD_ALIGN THREAD_SIZE
+#endif
+
+#define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_ZERO)
+
+/*
+ * flag set/clear/test wrappers
+ * - pass TIF_xxxx constants to these functions
+ */
+
+static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
+{
+ set_bit(flag, (unsigned long *)&ti->flags);
+}
+
+static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
+{
+ clear_bit(flag, (unsigned long *)&ti->flags);
+}
+
+static inline void update_ti_thread_flag(struct thread_info *ti, int flag,
+ bool value)
+{
+ if (value)
+ set_ti_thread_flag(ti, flag);
+ else
+ clear_ti_thread_flag(ti, flag);
+}
+
+static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag)
+{
+ return test_and_set_bit(flag, (unsigned long *)&ti->flags);
+}
+
+static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag)
+{
+ return test_and_clear_bit(flag, (unsigned long *)&ti->flags);
+}
+
+static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
+{
+ return test_bit(flag, (unsigned long *)&ti->flags);
+}
+
+#define set_thread_flag(flag) \
+ set_ti_thread_flag(current_thread_info(), flag)
+#define clear_thread_flag(flag) \
+ clear_ti_thread_flag(current_thread_info(), flag)
+#define update_thread_flag(flag, value) \
+ update_ti_thread_flag(current_thread_info(), flag, value)
+#define test_and_set_thread_flag(flag) \
+ test_and_set_ti_thread_flag(current_thread_info(), flag)
+#define test_and_clear_thread_flag(flag) \
+ test_and_clear_ti_thread_flag(current_thread_info(), flag)
+#define test_thread_flag(flag) \
+ test_ti_thread_flag(current_thread_info(), flag)
+
+#define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED)
+
+#ifndef CONFIG_HAVE_ARCH_WITHIN_STACK_FRAMES
+static inline int arch_within_stack_frames(const void * const stack,
+ const void * const stackend,
+ const void *obj, unsigned long len)
+{
+ return 0;
+}
+#endif
+
+#ifdef CONFIG_HARDENED_USERCOPY
+extern void __check_object_size(const void *ptr, unsigned long n,
+ bool to_user);
+
+static __always_inline void check_object_size(const void *ptr, unsigned long n,
+ bool to_user)
+{
+ if (!__builtin_constant_p(n))
+ __check_object_size(ptr, n, to_user);
+}
+#else
+static inline void check_object_size(const void *ptr, unsigned long n,
+ bool to_user)
+{ }
+#endif /* CONFIG_HARDENED_USERCOPY */
+
+extern void __compiletime_error("copy source size is too small")
+__bad_copy_from(void);
+extern void __compiletime_error("copy destination size is too small")
+__bad_copy_to(void);
+
+static inline void copy_overflow(int size, unsigned long count)
+{
+ WARN(1, "Buffer overflow detected (%d < %lu)!\n", size, count);
+}
+
+static __always_inline bool
+check_copy_size(const void *addr, size_t bytes, bool is_source)
+{
+ int sz = __compiletime_object_size(addr);
+ if (unlikely(sz >= 0 && sz < bytes)) {
+ if (!__builtin_constant_p(bytes))
+ copy_overflow(sz, bytes);
+ else if (is_source)
+ __bad_copy_from();
+ else
+ __bad_copy_to();
+ return false;
+ }
+ check_object_size(addr, bytes, is_source);
+ return true;
+}
+
+#ifndef arch_setup_new_exec
+static inline void arch_setup_new_exec(void) { }
+#endif
+
+#endif /* __KERNEL__ */
+
+#endif /* _LINUX_THREAD_INFO_H */