linux-kernel - Re: copy_page() on a kmalloc-ed page with DEBUG_SLAB enabled (was "zram: do not use copy

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Message-ID: <20170418131349.GA18505@bombadil.infradead.org>
Date:   Tue, 18 Apr 2017 06:13:49 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Christoph Lameter <cl@...ux.com>
Cc:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Minchan Kim <minchan@...nel.org>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Vlastimil Babka <vbabka@...e.cz>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, kernel-team@....com,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Subject: Re: copy_page() on a kmalloc-ed page with DEBUG_SLAB enabled (was
 "zram: do not use copy_page with non-page alinged address")

On Mon, Apr 17, 2017 at 10:20:42AM -0500, Christoph Lameter wrote:
> Simple solution is to not allocate pages via the slab allocator but use
> the page allocator for this. The page allocator provides proper alignment.
> 
> There is a reason it is called the page allocator because if you want a
> page you use the proper allocator for it.

Previous discussion on this topic:

https://lwn.net/Articles/669015/
https://lwn.net/Articles/669020/