linux-kernel - Re: [PATCH 6/9] uprobes: flush cache after xol write

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Message-ID: <20121015165756.GA11737@redhat.com>
Date:	Mon, 15 Oct 2012 18:57:56 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Rabin Vincent <rabin@....in>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Peter Zijlstra <peterz@...radead.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Subject: Re: [PATCH 6/9] uprobes: flush cache after xol write

On 10/14, Rabin Vincent wrote:
>
> Flush the cache so that the instructions written to the XOL area are
> visible.
>
> Signed-off-by: Rabin Vincent <rabin@....in>
> ---
>  kernel/events/uprobes.c |    1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
> index ca000a9..8c52f93 100644
> --- a/kernel/events/uprobes.c
> +++ b/kernel/events/uprobes.c
> @@ -1246,6 +1246,7 @@ static unsigned long xol_get_insn_slot(struct uprobe *uprobe, unsigned long slot
>  	offset = current->utask->xol_vaddr & ~PAGE_MASK;
>  	vaddr = kmap_atomic(area->page);
>  	arch_uprobe_xol_copy(&uprobe->arch, vaddr + offset);
> +	flush_dcache_page(area->page);
>  	kunmap_atomic(vaddr);

I agree... but why under kmap_atomic?

Oleg.

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