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Date: Tue, 30 Jan 2018 18:01:52 +0800 From: Vincent Chen <deanbo422@...il.com> To: Arnd Bergmann <arnd@...db.de> Cc: Greentime Hu <green.hu@...il.com>, Greentime <greentime@...estech.com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, linux-arch <linux-arch@...r.kernel.org>, Thomas Gleixner <tglx@...utronix.de>, Jason Cooper <jason@...edaemon.net>, Marc Zyngier <marc.zyngier@....com>, Rob Herring <robh+dt@...nel.org>, Networking <netdev@...r.kernel.org>, DTML <devicetree@...r.kernel.org>, Al Viro <viro@...iv.linux.org.uk>, David Howells <dhowells@...hat.com>, Will Deacon <will.deacon@....com>, Daniel Lezcano <daniel.lezcano@...aro.org>, linux-serial@...r.kernel.org, Geert Uytterhoeven <geert.uytterhoeven@...il.com>, Linus Walleij <linus.walleij@...aro.org>, Mark Rutland <mark.rutland@....com>, Greg KH <greg@...ah.com>, Guo Ren <ren_guo@...ky.com>, Randy Dunlap <rdunlap@...radead.org>, David Miller <davem@...emloft.net>, Jonas Bonn <jonas@...thpole.se>, Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>, Stafford Horne <shorne@...il.com>, Vincent Chen <vincentc@...estech.com> Subject: Re: [PATCH v6 07/36] nds32: Exception handling 2018-01-24 19:10 GMT+08:00 Arnd Bergmann <arnd@...db.de>: > On Wed, Jan 24, 2018 at 12:09 PM, Arnd Bergmann <arnd@...db.de> wrote: >> On Wed, Jan 24, 2018 at 11:53 AM, Vincent Chen <deanbo422@...il.com> wrote: >>> 2018-01-18 18:14 GMT+08:00 Arnd Bergmann <arnd@...db.de>: > >> Ok. I still wonder about the kernel part of this though: is it a good idea >> for user space to configure whether the kernel does unaligned >> accesses? I would think that the kernel should just be fixed in such >> a case. > > To clarify: I'm asking only about unaligned accesses from kernel code itself, > which is generally considered a bug when > CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS is disabled. > > Arnd Thanks for your comments. For performance, we decide always disable CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS even if hardware supports unaligned accessing. Therefore, I will remove kernel unaligned accessing from nds32/mm/alignment.c. In other words, alignment.c only addresses unaligned accessing for user space. Vincent
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