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

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Message-ID: <20121114173717.GA19466@redhat.com>
Date:	Wed, 14 Nov 2012 18:37:17 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Ananth N Mavinakayanahalli <ananth@...ibm.com>
Cc:	Rabin Vincent <rabin@....in>, 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 11/04, Ananth N Mavinakayanahalli wrote:
>
> On Sat, Nov 03, 2012 at 05:33:01PM +0100, Oleg Nesterov wrote:
> >
> > [PATCH] uprobes: flush cache after xol write
> >
> > From: Rabin Vincent <rabin@....in>
> >
> > Flush the cache so that the instructions written to the XOL area are
> > visible.
> >
> > Signed-off-by: Rabin Vincent <rabin@....in>
>
> Acked-by: Ananth N Mavinakayanahalli <ananth@...ibm.com>

Thanks Ananth.

I assume that Srikar and Rabin agree, applied as 65b6ecc038

> >
> > --- x/kernel/events/uprobes.c
> > +++ x/kernel/events/uprobes.c
> > @@ -1199,6 +1199,11 @@ static unsigned long xol_get_insn_slot(s
> >  	vaddr = kmap_atomic(area->page);
> >  	memcpy(vaddr + offset, uprobe->arch.insn, MAX_UINSN_BYTES);
> >  	kunmap_atomic(vaddr);
> > +	/*
> > +	 * We probably need flush_icache_user_range() but it needs vma.
> > +	 * This should work on supported architectures too.
> > +	 */
> > +	flush_dcache_page(area->page);
> >
> >  	return current->utask->xol_vaddr;
> >  }

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