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Subject[PATCH 1/4] set_restore_sigmask
Date
This adds the set_restore_sigmask() inline in <linux/thread_info.h> and
replaces every set_thread_flag(TIF_RESTORE_SIGMASK) with a call to it.
No change, but abstracts the flag protocol details from all the calls.

Signed-off-by: Roland McGrath <roland@redhat.com>
---
fs/compat.c | 6 +++---
fs/eventpoll.c | 3 +--
fs/select.c | 4 ++--
include/linux/thread_info.h | 15 ++++++++++++++-
kernel/compat.c | 3 +--
kernel/signal.c | 2 +-
6 files changed, 22 insertions(+), 11 deletions(-)
diff --git a/fs/compat.c b/fs/compat.c
index 2ce4456..9964d54 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -1720,7 +1720,7 @@ sticky:
if (sigmask) {
memcpy(&current->saved_sigmask, &sigsaved,
sizeof(sigsaved));
- set_thread_flag(TIF_RESTORE_SIGMASK);
+ set_restore_sigmask();
}
} else if (sigmask)
sigprocmask(SIG_SETMASK, &sigsaved, NULL);
@@ -1791,7 +1791,7 @@ asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
if (sigmask) {
memcpy(&current->saved_sigmask, &sigsaved,
sizeof(sigsaved));
- set_thread_flag(TIF_RESTORE_SIGMASK);
+ set_restore_sigmask();
}
ret = -ERESTARTNOHAND;
} else if (sigmask)
@@ -2117,7 +2117,7 @@ asmlinkage long compat_sys_epoll_pwait(int epfd,
if (err == -EINTR) {
memcpy(&current->saved_sigmask, &sigsaved,
sizeof(sigsaved));
- set_thread_flag(TIF_RESTORE_SIGMASK);
+ set_restore_sigmask();
} else
sigprocmask(SIG_SETMASK, &sigsaved, NULL);
}
diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index a415f42..503ffa4 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -1300,7 +1300,7 @@ asmlinkage long sys_epoll_pwait(int epfd, struct epoll_event __user *events,
if (error == -EINTR) {
memcpy(&current->saved_sigmask, &sigsaved,
sizeof(sigsaved));
- set_thread_flag(TIF_RESTORE_SIGMASK);
+ set_restore_sigmask();
} else
sigprocmask(SIG_SETMASK, &sigsaved, NULL);
}
@@ -1330,4 +1330,3 @@ static int __init eventpoll_init(void)
return 0;
}
fs_initcall(eventpoll_init);
-
diff --git a/fs/select.c b/fs/select.c
index 5633fe9..bbd351c 100644
--- a/fs/select.c
+++ b/fs/select.c
@@ -498,7 +498,7 @@ sticky:
if (sigmask) {
memcpy(&current->saved_sigmask, &sigsaved,
sizeof(sigsaved));
- set_thread_flag(TIF_RESTORE_SIGMASK);
+ set_restore_sigmask();
}
} else if (sigmask)
sigprocmask(SIG_SETMASK, &sigsaved, NULL);
@@ -805,7 +805,7 @@ asmlinkage long sys_ppoll(struct pollfd __user *ufds, unsigned int nfds,
if (sigmask) {
memcpy(&current->saved_sigmask, &sigsaved,
sizeof(sigsaved));
- set_thread_flag(TIF_RESTORE_SIGMASK);
+ set_restore_sigmask();
}
ret = -ERESTARTNOHAND;
} else if (sigmask)
diff --git a/include/linux/thread_info.h b/include/linux/thread_info.h
index 421323e..d82c073 100644
--- a/include/linux/thread_info.h
+++ b/include/linux/thread_info.h
@@ -80,6 +80,19 @@ static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
#define set_need_resched() set_thread_flag(TIF_NEED_RESCHED)
#define clear_need_resched() clear_thread_flag(TIF_NEED_RESCHED)

-#endif
+#ifdef TIF_RESTORE_SIGMASK
+/**
+ * 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.
+ */
+static inline void set_restore_sigmask(void)
+{
+ set_thread_flag(TIF_RESTORE_SIGMASK);
+}
+#endif /* TIF_RESTORE_SIGMASK */
+
+#endif /* __KERNEL__ */

#endif /* _LINUX_THREAD_INFO_H */
diff --git a/kernel/compat.c b/kernel/compat.c
index 5f0e201..a830c84 100644
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -899,7 +899,7 @@ asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat

current->state = TASK_INTERRUPTIBLE;
schedule();
- set_thread_flag(TIF_RESTORE_SIGMASK);
+ set_restore_sigmask();
return -ERESTARTNOHAND;
}
#endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
@@ -1081,4 +1081,3 @@ compat_sys_sysinfo(struct compat_sysinfo __user *info)

return 0;
}
-
diff --git a/kernel/signal.c b/kernel/signal.c
index 6af1210..977b3cd 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -2610,7 +2610,7 @@ asmlinkage long sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize)

current->state = TASK_INTERRUPTIBLE;
schedule();
- set_thread_flag(TIF_RESTORE_SIGMASK);
+ set_restore_sigmask();
return -ERESTARTNOHAND;
}
#endif /* __ARCH_WANT_SYS_RT_SIGSUSPEND */

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