linux-kernel - Re: [PATCH v5 03/10] swiotlb: Map the buffer if it was unmapped by XPFO

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Message-ID: <20170810162256.ah4yre6xjbfd5oi3@smitten>
Date:   Thu, 10 Aug 2017 10:22:56 -0600
From:   Tycho Andersen <tycho@...ker.com>
To:     Konrad Rzeszutek Wilk <konrad@...nok.org>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        kernel-hardening@...ts.openwall.com,
        Marco Benatto <marco.antonio.780@...il.com>,
        Juerg Haefliger <juerg.haefliger@...onical.com>,
        Juerg Haefliger <juerg.haefliger@....com>
Subject: Re: [PATCH v5 03/10] swiotlb: Map the buffer if it was unmapped by
 XPFO

On Thu, Aug 10, 2017 at 09:01:06AM -0400, Konrad Rzeszutek Wilk wrote:
> On Wed, Aug 09, 2017 at 02:07:48PM -0600, Tycho Andersen wrote:
> > +inline bool xpfo_page_is_unmapped(struct page *page)
> > +{
> > +	if (!static_branch_unlikely(&xpfo_inited))
> > +		return false;
> > +
> > +	return test_bit(XPFO_PAGE_UNMAPPED, &lookup_xpfo(page)->flags);
> > +}
> > +EXPORT_SYMBOL(xpfo_page_is_unmapped);
> 
> How can it be inline and 'EXPORT_SYMBOL' ? And why make it inline? It
> surely does not need to be access that often?

Good point. I'll drop inline from the next version, thanks!

Tycho