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Date: Thu, 18 Feb 2016 21:14:40 +0100 From: Ingo Molnar <mingo@...nel.org> To: "Luck, Tony" <tony.luck@...el.com> Cc: Linus Torvalds <torvalds@...ux-foundation.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Thomas Gleixner <tglx@...utronix.de>, "H. Peter Anvin" <hpa@...or.com>, Peter Zijlstra <a.p.zijlstra@...llo.nl> Subject: Re: [PATCH v11 3/4] x86, mce: Add __mcsafe_copy() * Luck, Tony <tony.luck@...el.com> wrote: > On Thu, Feb 18, 2016 at 10:12:42AM -0800, Linus Torvalds wrote: > > On Wed, Feb 17, 2016 at 10:20 AM, Tony Luck <tony.luck@...el.com> wrote: > > > > > > If we faulted during the copy, then 'trapnr' will say which type > > > of trap (X86_TRAP_PF or X86_TRAP_MC) and 'remain' says how many > > > bytes were not copied. > > > > So apart from the naming, a couple of questions: > > > > - I'd like to see the actual *use* case explained, not just what it does. > > First user is libnvdimm. Dan Williams already has code to use this so that > kernel code accessing persistent memory can return -EIO to a user instead of > crashing the system if the cpu runs into an uncorrected error during the copy. Are these the memcpy_*_pmem() calls in drivers/nvdimm/pmem.c? Is there any actual patch to look at? Thanks, Ingo
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