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signals: add set_restore_sigmask

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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 details of the flag protocol from all the calls.

Signed-off-by: Roland McGrath <roland@redhat.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: "Luck, Tony" <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Roland McGrath 2008-04-30 00:53:06 -07:00 committed by Linus Torvalds
parent 80fe728d59
commit 4e4c22c711
6 changed files with 22 additions and 11 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
fs/compat.c
View file

@ -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);
}

3
fs/eventpoll.c
View file

@ -1279,7 +1279,7 @@ 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);
}
@ -1309,4 +1309,3 @@ static int __init eventpoll_init(void)
return 0;
}
fs_initcall(eventpoll_init);

4
fs/select.c
View file

@ -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)

15
include/linux/thread_info.h
View file

@ -92,6 +92,19 @@ 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 */

3
kernel/compat.c
View file

@ -898,7 +898,7 @@ 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 */
@ -1080,4 +1080,3 @@ compat_sys_sysinfo(struct compat_sysinfo __user *info)
return 0;
}

2
kernel/signal.c
View file

@ -2541,7 +2541,7 @@ 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 */