From: Christoph Lameter <cl@linux.com>
To: Andreas Krebbel1 <Andreas.Krebbel@de.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
kbuild test robot <fengguang.wu@intel.com>,
heicars2@linux.vnet.ibm.com, kbuild-all@01.org,
Linux Memory Management List <linux-mm@kvack.org>,
mschwid2@linux.vnet.ibm.com
Subject: Re: [linux-next:master 12891/13017] mm/slub.c:2396:1: warning: '___slab_alloc' uses dynamic stack allocation
Date: Fri, 13 Nov 2015 11:05:34 -0600 (CST) [thread overview]
Message-ID: <alpine.DEB.2.20.1511131105030.16068@east.gentwo.org> (raw)
In-Reply-To: <201511131532.tADFWgYs000305@d06av09.portsmouth.uk.ibm.com>
On Fri, 13 Nov 2015, Andreas Krebbel1 wrote:
> > The slub uses of struct page only require an alignment of the page
> struct
> > on the stack to a word. So its fine.
>
> Our compare and swap double hardware instruction unfortunately requires 16
> byte alignment. That's probably the reason why this alignment has been
> picked. So I don't think that we can easily get rid of it.
The cmpxchg double is not run on the page struct on the stack. Its just
used because I wanted to duplicate the counter layout.
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next prev parent reply other threads:[~2015-11-13 17:05 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-11 6:34 kbuild test robot
2015-11-11 20:41 ` Andrew Morton
2015-11-13 11:52 ` Martin Schwidefsky
2015-11-13 15:13 ` Andreas Krebbel1
[not found] ` <201511131513.tADFDwJN030997@d06av03.portsmouth.uk.ibm.com>
2015-11-13 15:22 ` Christoph Lameter
2015-11-13 15:32 ` Andreas Krebbel1
[not found] ` <201511131532.tADFWgYs000305@d06av09.portsmouth.uk.ibm.com>
2015-11-13 17:05 ` Christoph Lameter [this message]
[not found] ` <201511131414.tADEE1co028795@d06av10.portsmouth.uk.ibm.com>
2015-11-16 8:47 ` Martin Schwidefsky
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