From: "H. Peter Anvin" <hpa@zytor.com>
To: Vivek Goyal <vgoyal@redhat.com>
Cc: Dave Hansen <dave@sr71.net>,
"kexec@lists.infradead.org" <kexec@lists.infradead.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Thomas Renninger <trenn@suse.de>,
Simon Horman <horms@verge.net.au>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Yinghai Lu <yinghai@kernel.org>, Cliff Wickman <cpw@sgi.com>
Subject: Re: [PATCH 5/5] kexec: X86: Pass memory ranges via e820 table instead of memmap= boot parameter
Date: Fri, 12 Apr 2013 07:56:11 -0700 [thread overview]
Message-ID: <5168208B.7050107@zytor.com> (raw)
In-Reply-To: <20130412143104.GA4301@redhat.com>
On 04/12/2013 07:31 AM, Vivek Goyal wrote:
>>
>> I also have to admit that I don't see the difference between /dev/mem
>> and /dev/oldmem, as the former allows access to memory ranges outside
>> the ones used by the current kernel, which is what the oldmem device
>> seems to be intended to od.
>
> I think one difference seems to be that /dev/mem assumes that validly
> accessed memory is already mapped in kernel while /dev/oldmeme assumes
> it is not mapped and creates temporary mappings explicitly.
>
Dave Hansen has been working on fixing /dev/mem for HIGHMEM.
-hpa
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WARNING: multiple messages have this Message-ID (diff)
From: "H. Peter Anvin" <hpa@zytor.com>
To: Vivek Goyal <vgoyal@redhat.com>
Cc: Yinghai Lu <yinghai@kernel.org>, Thomas Renninger <trenn@suse.de>,
Simon Horman <horms@verge.net.au>,
"kexec@lists.infradead.org" <kexec@lists.infradead.org>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Cliff Wickman <cpw@sgi.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Dave Hansen <dave@sr71.net>
Subject: Re: [PATCH 5/5] kexec: X86: Pass memory ranges via e820 table instead of memmap= boot parameter
Date: Fri, 12 Apr 2013 07:56:11 -0700 [thread overview]
Message-ID: <5168208B.7050107@zytor.com> (raw)
In-Reply-To: <20130412143104.GA4301@redhat.com>
On 04/12/2013 07:31 AM, Vivek Goyal wrote:
>>
>> I also have to admit that I don't see the difference between /dev/mem
>> and /dev/oldmem, as the former allows access to memory ranges outside
>> the ones used by the current kernel, which is what the oldmem device
>> seems to be intended to od.
>
> I think one difference seems to be that /dev/mem assumes that validly
> accessed memory is already mapped in kernel while /dev/oldmeme assumes
> it is not mapped and creates temporary mappings explicitly.
>
Dave Hansen has been working on fixing /dev/mem for HIGHMEM.
-hpa
next prev parent reply other threads:[~2013-04-12 14:56 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-11 12:26 Cleanups and passing memory ranges via e820 table instead of memmap= Thomas Renninger
2013-04-11 12:26 ` [PATCH 1/5] kexec: X86: Show e820 table which gets passed in debug mode Thomas Renninger
2013-04-11 12:26 ` [PATCH 2/5] kexec: X86: Enhance crash range debug output Thomas Renninger
2013-04-11 12:26 ` [PATCH 3/5] kexec: X86: Do not exclude memory regions in each get_xy_memory_range() func Thomas Renninger
2013-04-11 12:26 ` [PATCH 4/5] kexec: X86: make crash_memory_range global and store its no of elements in crash_ranges Thomas Renninger
2013-04-11 12:26 ` [PATCH 5/5] kexec: X86: Pass memory ranges via e820 table instead of memmap= boot parameter Thomas Renninger
2013-04-11 14:55 ` Yinghai Lu
2013-04-11 14:55 ` Yinghai Lu
2013-04-11 15:06 ` H. Peter Anvin
2013-04-11 15:06 ` H. Peter Anvin
2013-04-12 14:31 ` Vivek Goyal
2013-04-12 14:31 ` Vivek Goyal
2013-04-12 14:56 ` H. Peter Anvin [this message]
2013-04-12 14:56 ` H. Peter Anvin
2013-04-12 22:17 ` Dave Hansen
2013-04-12 22:17 ` Dave Hansen
2013-04-12 23:17 ` H. Peter Anvin
2013-04-12 23:17 ` H. Peter Anvin
2013-04-15 4:52 ` HATAYAMA Daisuke
2013-04-15 4:52 ` HATAYAMA Daisuke
2013-04-15 5:58 ` Dave Hansen
2013-04-15 5:58 ` Dave Hansen
2013-04-15 7:58 ` HATAYAMA Daisuke
2013-04-15 7:58 ` HATAYAMA Daisuke
2013-04-15 14:49 ` H. Peter Anvin
2013-04-15 14:49 ` H. Peter Anvin
2013-04-12 12:24 ` Thomas Renninger
2013-04-12 12:24 ` Thomas Renninger
2013-04-12 9:56 ` Zhang Yanfei
2013-04-12 11:12 ` Thomas Renninger
2013-04-15 9:05 ` Thomas Renninger
2013-04-15 12:20 ` H. Peter Anvin
2013-04-15 19:48 ` Thomas Renninger
2013-04-15 19:54 ` H. Peter Anvin
2013-04-16 7:52 ` Thomas Renninger
2013-04-16 11:59 ` H. Peter Anvin
2013-04-16 12:41 ` Zhang Yanfei
2013-04-12 15:24 ` Eric W. Biederman
2013-04-15 11:48 ` Thomas Renninger
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