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Date:   Tue, 23 Jul 2019 13:44:16 -0700
From:   Ira Weiny <ira.weiny@intel.com>
To:     Matthew Wilcox <willy@infradead.org>
Cc:     Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org,
        Atul Gupta <atul.gupta@chelsio.com>,
        linux-crypto@vger.kernel.org
Subject: Re: [PATCH v2 1/3] mm: Introduce page_size()
Message-ID: <20190723204416.GA27491@iweiny-DESK2.sc.intel.com>
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On Tue, Jul 23, 2019 at 11:14:13AM -0700, Matthew Wilcox wrote:
> On Tue, Jul 23, 2019 at 10:58:38AM -0700, Ira Weiny wrote:
> > > @@ -1092,7 +1092,7 @@ int chtls_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
> > >  			if (page && off == pg_size) {
> > >  				put_page(page);
> > >  				TCP_PAGE(sk) = page = NULL;
> > > -				pg_size = PAGE_SIZE;
> > > +				pg_size = 0;
> > 
> > Yea...  I was not sure about this one at first...  :-/
> 
> I'm not sure we actually need to change pg_size here, but it seemed
> appropriate to set it back to 0.
> 
> > >  							   __GFP_NORETRY,
> > >  							   order);
> > > -					if (page)
> > > -						pg_size <<= order;
> > >  				}
> > >  				if (!page) {
> > >  					page = alloc_page(gfp);
> > > -					pg_size = PAGE_SIZE;
> > >  				}
> > >  				if (!page)
> > >  					goto wait_for_memory;
> > 
> > Side note: why 2 checks for !page?
> 
> Because page is assigned to after the first check ...

Ah yea duh!  Sorry it is a bit hard to follow.

Ira