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

[Oleg Nesterov]

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@xxxxxx>
> ---
>  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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