linux-kernel - Re: [PATCH] uprobes: wait for mmap

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Message-ID: <20160229182256.GQ16930@dhcp22.suse.cz>
Date:	Mon, 29 Feb 2016 19:22:56 +0100
From:	Michal Hocko <mhocko@...nel.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org
Subject: Re: [PATCH] uprobes: wait for mmap_sem for write killable

On Mon 29-02-16 19:11:06, Oleg Nesterov wrote:
> On 02/29, Michal Hocko wrote:
> >
> > --- a/kernel/events/uprobes.c
> > +++ b/kernel/events/uprobes.c
> > @@ -1130,7 +1130,9 @@ static int xol_add_vma(struct mm_struct *mm, struct xol_area *area)
> >  	struct vm_area_struct *vma;
> >  	int ret;
> >  
> > -	down_write(&mm->mmap_sem);
> > +	if (down_write_killable(&mm->mmap_sem))
> > +		return -EINTR;
> > +
> >  	if (mm->uprobes_state.xol_area) {
> >  		ret = -EALREADY;
> >  		goto fail;
> > @@ -1468,7 +1470,8 @@ static void dup_xol_work(struct callback_head *work)
> >  	if (current->flags & PF_EXITING)
> >  		return;
> >  
> > -	if (!__create_xol_area(current->utask->dup_xol_addr))
> > +	if (!__create_xol_area(current->utask->dup_xol_addr) &&
> > +			!fatal_signal_pending(current)
> >  		uprobe_warn(current, "dup xol area");
> >  }
> 
> Looks good, thanks.

Can I consider this your Acked-by?

-- 
Michal Hocko
SUSE Labs