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kernel: remove checking for TIF_NOTIFY_SIGNAL 

ANBZ: #6478

[ Upstream commit e296dc4996 ]

It's available everywhere now, no need to check or add dummy defines.

[backport note]
We added dummy _TIF_NOTIFY_SIGNAL define in 'entry: Add support for
TIF_NOTIFY_SIGNAL'. As it has been defined in arch dirs, this now can be
removed.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Signed-off-by: Ferry Meng <mengferry@linux.alibaba.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Acked-by: Zelin Deng <zelin.deng@linux.alibaba.com>
Acked-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Link: https://gitee.com/anolis/cloud-kernel/pulls/2195
This commit is contained in:
Jens Axboe 2020-10-09 16:04:39 -06:00 committed by 小龙
parent b807763492
commit c6cc5e1a78
5 changed files with 0 additions and 16 deletions
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4
include/linux/entry-common.h
View File

@ -37,10 +37,6 @@
# define _TIF_UPROBE (0)
#endif
#ifndef _TIF_NOTIFY_SIGNAL
# define _TIF_NOTIFY_SIGNAL (0)
#endif
/*
* TIF flags handled in syscall_enter_from_user_mode()
*/

4
include/linux/entry-kvm.h
View File

@ -15,10 +15,6 @@
# define ARCH_XFER_TO_GUEST_MODE_WORK (0)
#endif
#ifndef _TIF_NOTIFY_SIGNAL
# define _TIF_NOTIFY_SIGNAL (0)
#endif
#define XFER_TO_GUEST_MODE_WORK \
(_TIF_NEED_RESCHED | _TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL | \
_TIF_NOTIFY_RESUME | ARCH_XFER_TO_GUEST_MODE_WORK)

2
include/linux/sched/signal.h
View File

@ -366,7 +366,6 @@ static inline int task_sigpending(struct task_struct *p)
static inline int signal_pending(struct task_struct *p)
{
#if defined(TIF_NOTIFY_SIGNAL)
/*
* TIF_NOTIFY_SIGNAL isn't really a signal, but it requires the same
* behavior in terms of ensuring that we break out of wait loops
@ -374,7 +373,6 @@ static inline int signal_pending(struct task_struct *p)
*/
if (unlikely(test_tsk_thread_flag(p, TIF_NOTIFY_SIGNAL)))
return 1;
#endif
return task_sigpending(p);
}

4
include/linux/tracehook.h
View File

@ -206,12 +206,10 @@ static inline void tracehook_notify_resume(struct pt_regs *regs)
*/
static inline void tracehook_notify_signal(void)
{
#if defined(TIF_NOTIFY_SIGNAL)
clear_thread_flag(TIF_NOTIFY_SIGNAL);
smp_mb__after_atomic();
if (current->task_works)
task_work_run();
#endif
}
/*
@ -219,11 +217,9 @@ static inline void tracehook_notify_signal(void)
*/
static inline void set_notify_signal(struct task_struct *task)
{
#if defined(TIF_NOTIFY_SIGNAL)
if (!test_and_set_tsk_thread_flag(task, TIF_NOTIFY_SIGNAL) &&
!wake_up_state(task, TASK_INTERRUPTIBLE))
kick_process(task);
#endif
}
#endif /* <linux/tracehook.h> */

2
kernel/signal.c
View File

@ -2526,14 +2526,12 @@ bool get_signal(struct ksignal *ksig)
* that the arch handlers don't all have to do it. If we get here
* without TIF_SIGPENDING, just exit after running signal work.
*/
#ifdef TIF_NOTIFY_SIGNAL
if (!IS_ENABLED(CONFIG_GENERIC_ENTRY)) {
if (test_thread_flag(TIF_NOTIFY_SIGNAL))
tracehook_notify_signal();
if (!task_sigpending(current))
return false;
}
#endif
if (unlikely(uprobe_deny_signal()))
return false;