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From: Jens Axboe <[email protected]>
To: Oleg Nesterov <[email protected]>
Cc: [email protected], [email protected],
	[email protected], [email protected]
Subject: Re: [PATCH 3/6] kernel: split syscall restart from signal handling
Date: Thu, 8 Oct 2020 08:31:32 -0600	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

On 10/8/20 8:21 AM, Oleg Nesterov wrote:
> On 10/05, Jens Axboe wrote:
>>
>> Move the restart syscall logic into a separate generic entry helper,
>> and handle that part separately from signal checking and delivery.
>>
>> This is in preparation for being able to do syscall restarting
>> independently from handling signals.
>>
>> Signed-off-by: Jens Axboe <[email protected]>
>> ---
>>  arch/x86/kernel/signal.c     | 32 ++++++++++++++++++--------------
>>  include/linux/entry-common.h | 14 ++++++++++++--
>>  kernel/entry/common.c        | 11 ++++++++---
>>  3 files changed, 38 insertions(+), 19 deletions(-)
> 
> Can't we avoid this patch and the and simplify the change in
> exit_to_user_mode_loop() from the next patch? Can't the much more simple
> patch below work?
> 
> Then later we can even change arch_do_signal() to accept the additional
> argument, ti_work, so that it can use ti_work & TIF_NOTIFY_SIGNAL/SIGPENDING
> instead of test_thread_flag/task_sigpending.

Yeah I guess that would be a bit simpler, maybe I'm too focused on
decoupling the two. But if we go this route, and avoid sighand->lock for
just having TIF_NOTIFY_SIGNAL set, then that should be functionally
equivalent as far as I'm concerned.

I'll make the reduction, I'd prefer to keep this as small/simple as
possible initially.

-- 
Jens Axboe


  reply	other threads:[~2020-10-08 14:31 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-05 15:04 [PATCHSET RFC v3 0/6] Add support for TIF_NOTIFY_SIGNAL Jens Axboe
2020-10-05 15:04 ` [PATCH 1/6] tracehook: clear TIF_NOTIFY_RESUME in tracehook_notify_resume() Jens Axboe
2020-10-08 12:37   ` Oleg Nesterov
2020-10-08 13:36     ` Jens Axboe
2020-10-05 15:04 ` [PATCH 2/6] kernel: add task_sigpending() helper Jens Axboe
2020-10-08 12:58   ` Oleg Nesterov
2020-10-08 13:36     ` Jens Axboe
2020-10-08 13:24   ` Oleg Nesterov
2020-10-08 13:38     ` Jens Axboe
2020-10-05 15:04 ` [PATCH 3/6] kernel: split syscall restart from signal handling Jens Axboe
2020-10-08 14:21   ` Oleg Nesterov
2020-10-08 14:31     ` Jens Axboe [this message]
2020-10-08 14:41       ` Jens Axboe
2020-10-08 14:45       ` Oleg Nesterov
2020-10-08 14:47         ` Jens Axboe
2020-10-05 15:04 ` [PATCH 4/6] kernel: add support for TIF_NOTIFY_SIGNAL Jens Axboe
2020-10-08 13:53   ` Oleg Nesterov
2020-10-08 14:07     ` Jens Axboe
2020-10-08 14:27       ` Oleg Nesterov
2020-10-05 15:04 ` [PATCH 5/6] x86: define _TIF_NOTIFY_SIGNAL Jens Axboe
2020-10-05 15:04 ` [PATCH 6/6] task_work: use TIF_NOTIFY_SIGNAL if available Jens Axboe
2020-10-08 14:56 ` [PATCHSET RFC v3 0/6] Add support for TIF_NOTIFY_SIGNAL Oleg Nesterov
2020-10-08 15:00   ` Jens Axboe
2020-10-09  8:01   ` Miroslav Benes
2020-10-09 15:21     ` Jens Axboe
2020-10-10 16:53       ` Jens Axboe
2020-10-12 17:27         ` Miroslav Benes
2020-10-13 19:39           ` Jens Axboe
2020-10-13 23:34             ` Thomas Gleixner
2020-10-13 23:37               ` Jens Axboe

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