From: Vineet Gupta <Vineet.Gupta1@synopsys.com>
To: Mike Rapoport <rppt@linux.ibm.com>
Cc: Mike Rapoport <rppt@kernel.org>,
Guenter Roeck <linux@roeck-us.net>, Rich Felker <dalias@libc.org>,
"linux-ia64@vger.kernel.org" <linux-ia64@vger.kernel.org>,
"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
"x86@kernel.org" <x86@kernel.org>,
Michal Hocko <mhocko@kernel.org>,
"James E.J. Bottomley" <James.Bottomley@hansenpartnership.com>,
Max Filippov <jcmvbkbc@gmail.com>, Guo Ren <guoren@kernel.org>,
Ley Foon Tan <ley.foon.tan@intel.com>,
"sparclinux@vger.kernel.org" <sparclinux@vger.kernel.org>,
"linux-riscv@lists.infradead.org"
<linux-riscv@lists.infradead.org>,
Greg Ungerer <gerg@linux-m68k.org>,
"linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>,
"linux-s390@vger.kernel.org" <linux-s390@vger.kernel.org>,
"linux-c6x-dev@linux-c6x.org" <linux-c6x-dev@linux-c6x.org>,
Baoquan He <bhe@redhat.com>, Jonathan Corbet <corbet@lwn.net>,
"linux-hexagon@vger.kernel.org" <linux-hexagon@vger.kernel.org>,
Helge Deller <deller@gmx.de>,
"linux-sh@vger.kernel.org" <linux-sh@vger.kernel.org>,
Russell King <linux@armlinux.org.uk>,
"linux-csky@vger.kernel.org" <linux-csky@vger.kernel.org>,
Geert Uytterhoeven <geert@linux-m68k.org>
Subject: Re: [PATCH v2 17/20] mm: free_area_init: allow defining max_zone_pfn in descending order
Date: Tue, 5 May 2020 18:07:46 +0000 [thread overview]
Message-ID: <88b9465b-6e6d-86ca-3776-ccb7a5b60b7f@synopsys.com> (raw)
In-Reply-To: <20200505091946.GG342687@linux.ibm.com>
On 5/5/20 2:19 AM, Mike Rapoport wrote:
> From the code I've got the impression that it is either one of them. I.e
> the physical memory is either at
>
> 0x8000_0000 - <end of DDR 0 bank>
> 0x0000_0000 - <end of DDR 1 bank>
>
> or
>
> 0x0_8000_0000 - <end of DDR 0 bank>
> 0x1_0000_0000 - <end of DDR 1 bank>
>
> Is this possible to have a system with three live ranges? Like
>
> 0x0_0000_0000 - <end of DDR 1 bank>
> 0x0_8000_0000 - <end of DDR 0 bank>
> 0x1_0000_0000 - <end of DDR 2 bank>
We don't have such a system, but it is indeed possible in theory. The question is
- Can other arches have such a setup too
- Is it not better to have the core retain the flexibility just in case
Thx,
-Vineet
next prev parent reply other threads:[~2020-05-05 18:07 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20200429121126.17989-1-rppt@kernel.org>
[not found] ` <20200429121126.17989-18-rppt@kernel.org>
[not found] ` <20200503174138.GA114085@roeck-us.net>
[not found] ` <20200503184300.GA154219@roeck-us.net>
[not found] ` <20200504153901.GM14260@kernel.org>
2020-05-05 6:23 ` [PATCH v2 17/20] mm: free_area_init: allow defining max_zone_pfn in descending order Vineet Gupta
2020-05-05 9:19 ` Mike Rapoport
2020-05-05 18:07 ` Vineet Gupta [this message]
2020-05-05 20:15 ` Mike Rapoport
2020-05-07 20:59 ` Mike Rapoport
2020-05-07 21:21 ` Vineet Gupta
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