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-rw-r--r--include/linux/thread_info.h150
1 files changed, 150 insertions, 0 deletions
diff --git a/include/linux/thread_info.h b/include/linux/thread_info.h
new file mode 100644
index 000000000..b42ba9169
--- /dev/null
+++ b/include/linux/thread_info.h
@@ -0,0 +1,150 @@
+/* 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>
+
+struct timespec;
+struct compat_timespec;
+
+/*
+ * System call restart block.
+ */
+struct restart_block {
+ long (*fn)(struct restart_block *);
+ union {
+ /* For futex_wait and futex_wait_requeue_pi */
+ struct {
+ u32 __user *uaddr;
+ u32 val;
+ u32 flags;
+ u32 bitset;
+ u64 time;
+ u32 __user *uaddr2;
+ } futex;
+ /* For nanosleep */
+ struct {
+ clockid_t clockid;
+ struct timespec __user *rmtp;
+#ifdef CONFIG_COMPAT
+ struct compat_timespec __user *compat_rmtp;
+#endif
+ u64 expires;
+ } nanosleep;
+ /* For poll */
+ struct {
+ struct pollfd __user *ufds;
+ int nfds;
+ int has_timeout;
+ unsigned long tv_sec;
+ unsigned long tv_nsec;
+ } poll;
+ };
+};
+
+extern long do_no_restart_syscall(struct restart_block *parm);
+
+#include <linux/bitops.h>
+#include <asm/thread_info.h>
+
+#ifdef __KERNEL__
+
+#ifdef CONFIG_DEBUG_STACK_USAGE
+# define THREADINFO_GFP (GFP_KERNEL | __GFP_NOTRACK | ___GFP_TOI_NOTRACK | __GFP_ZERO)
+#else
+# define THREADINFO_GFP (GFP_KERNEL | __GFP_NOTRACK | ___GFP_TOI_NOTRACK)
+#endif
+
+/*
+ * 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 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 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)
+
+#if defined TIF_RESTORE_SIGMASK && !defined HAVE_SET_RESTORE_SIGMASK
+/*
+ * An arch can define its own version of set_restore_sigmask() to get the
+ * job done however works, with or without TIF_RESTORE_SIGMASK.
+ */
+#define HAVE_SET_RESTORE_SIGMASK 1
+
+/**
+ * set_restore_sigmask() - make sure saved_sigmask processing gets done
+ *
+ * This sets TIF_RESTORE_SIGMASK and ensures that the arch signal code
+ * will run before returning to user mode, to process the flag. For
+ * all callers, TIF_SIGPENDING is already set or it's no harm to set
+ * it. TIF_RESTORE_SIGMASK need not be in the set of bits that the
+ * arch code will notice on return to user mode, in case those bits
+ * are scarce. We set TIF_SIGPENDING here to ensure that the arch
+ * signal code always gets run when TIF_RESTORE_SIGMASK is set.
+ */
+static inline void set_restore_sigmask(void)
+{
+ set_thread_flag(TIF_RESTORE_SIGMASK);
+ WARN_ON(!test_thread_flag(TIF_SIGPENDING));
+}
+static inline void clear_restore_sigmask(void)
+{
+ clear_thread_flag(TIF_RESTORE_SIGMASK);
+}
+static inline bool test_restore_sigmask(void)
+{
+ return test_thread_flag(TIF_RESTORE_SIGMASK);
+}
+static inline bool test_and_clear_restore_sigmask(void)
+{
+ return test_and_clear_thread_flag(TIF_RESTORE_SIGMASK);
+}
+#endif /* TIF_RESTORE_SIGMASK && !HAVE_SET_RESTORE_SIGMASK */
+
+#ifndef HAVE_SET_RESTORE_SIGMASK
+#error "no set_restore_sigmask() provided and default one won't work"
+#endif
+
+#endif /* __KERNEL__ */
+
+#endif /* _LINUX_THREAD_INFO_H */