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

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Message-ID: <20160229181105.GG3615@redhat.com>
Date:	Mon, 29 Feb 2016 19:11:06 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Michal Hocko <mhocko@...nel.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	Michal Hocko <mhocko@...e.com>
Subject: Re: [PATCH] uprobes: wait for mmap_sem for write killable

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.

Oleg.