linux-kernel - Re: [Linux-nvdimm] [PATCH 2/3] x86: add a is_e820

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Message-ID: <CAPcyv4jxPbb9M7m3XrojhTSCwpvMC_bkbWfDcuB3T_=NjT_xKw@mail.gmail.com>
Date:	Thu, 26 Mar 2015 12:25:30 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	"Elliott, Robert (Server Storage)" <Elliott@...com>
Cc:	Christoph Hellwig <hch@....de>, Boaz Harrosh <boaz@...xistor.com>,
	"axboe@...nel.dk" <axboe@...nel.dk>,
	"linux-nvdimm@...1.01.org" <linux-nvdimm@...1.01.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [Linux-nvdimm] [PATCH 2/3] x86: add a is_e820_ram() helper

On Thu, Mar 26, 2015 at 11:46 AM, Elliott, Robert (Server Storage)
<Elliott@...com> wrote:
>
>
>> -----Original Message-----
>> From: linux-kernel-owner@...r.kernel.org [mailto:linux-kernel-
>> owner@...r.kernel.org] On Behalf Of Christoph Hellwig
>> Sent: Thursday, March 26, 2015 11:43 AM
>> To: Boaz Harrosh
>> Cc: Christoph Hellwig; Ingo Molnar; linux-nvdimm@...1.01.org; linux-
>> fsdevel@...r.kernel.org; linux-kernel@...r.kernel.org; x86@...nel.org;
>> ross.zwisler@...ux.intel.com; axboe@...nel.dk
>> Subject: Re: [PATCH 2/3] x86: add a is_e820_ram() helper
>>
>> On Thu, Mar 26, 2015 at 05:49:38PM +0200, Boaz Harrosh wrote:
>> > > + memmap=nn[KMG]!ss[KMG]
>> > > +                 [KNL,X86] Mark specific memory as protected.
>> > > +                 Region of memory to be used, from ss to ss+nn.
>> > > +                 The memory region may be marked as e820 type 12 (0xc)
>> > > +                 and is NVDIMM or ADR memory.
>> > > +
>> >
>> > Do we need to escape "\!" this character on grub command line ? It might
>> > help to note that. I did like the original "|" BTW
>>
>> No need to escape it on the kvm command line, which is where I tested
>> this flag only so far.  If there is a strong argument for "|" I'm happy
>> to change it.
>
> I agree with Boaz that ! is a nuisance if loading pmem as a module
> with modprobe from bash.

This is a core kernel command line, not a module parameter.  I'm not
saying that it should stay "!", but modprobe will not need to deal
with it.
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