linux-kernel - Re: [PATCH 2/2] task_work: check callback if it's NULL

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Date:	Fri, 15 Mar 2013 09:26:08 +0800
From:	li guang <lig.fnst@...fujitsu.com>
To:	Li Zefan <lizefan@...wei.com>
Cc:	Oleg Nesterov <oleg@...hat.com>, viro@...iv.linux.org.uk,
	edumazet@...gle.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] task_work: check callback if it's NULL

在 2013-03-15五的 09:01 +0800，Li Zefan写道：
> On 2013/3/15 8:20, li guang wrote:
> > 在 2013-03-14四的 15:43 +0100，Oleg Nesterov写道：
> >> On 03/14, liguang wrote:
> >>>
> >>> Signed-off-by: liguang <lig.fnst@...fujitsu.com>
> >>> ---
> >>>  kernel/task_work.c |    3 ++-
> >>>  1 files changed, 2 insertions(+), 1 deletions(-)
> >>>
> >>> diff --git a/kernel/task_work.c b/kernel/task_work.c
> >>> index 0bf4258..f458b08 100644
> >>> --- a/kernel/task_work.c
> >>> +++ b/kernel/task_work.c
> >>> @@ -75,7 +75,8 @@ void task_work_run(void)
> >>>
> >>>  		do {
> >>>  			next = work->next;
> >>> -			work->func(work);
> >>> +			if (unlikely(work->func))
> >>> +				work->func(work);
> >>
> >> Why?
> >>
> >> Oleg.
> >>
> > 
> > can we believe a callback always be call-able?
> > can it happened to be 0? e.g. wrong initialized.
> > of course, we can complain the caller, be why don't
> > we easily make it more safer?
> > 
> 
> Because you're not making things safer, but your're trying
> to cover up bugs...
> 

Oh, that's a little harsh to a normal programmer like me :-)
for it seems you are asking me to be coding without any bug.
are you? or it is the theory of kernel coding?



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