From: "H. Peter Anvin" <hpa@zytor.com>
To: Bob Liu <lliubbo@gmail.com>
Cc: linux-kernel@vger.kernel.org, akpm@linux-foundation.org,
hpa@linux.intel.com, yinghai@kernel.org, jacob.shin@amd.com,
konrad.wilk@oracle.com, linux-mm@kvack.org,
Bob Liu <bob.liu@oracle.com>
Subject: Re: [PATCH] x86: e820: fix memmap kernel boot parameter
Date: Fri, 30 Aug 2013 13:39:48 -0700 [thread overview]
Message-ID: <52210314.4080408@zytor.com> (raw)
In-Reply-To: <1377841673-17361-1-git-send-email-bob.liu@oracle.com>
On 08/29/2013 10:47 PM, Bob Liu wrote:
> Kernel boot parameter memmap=nn[KMG]$ss[KMG] is used to mark specific memory as
> reserved. Region of memory to be used is from ss to ss+nn.
>
> But I found the action of this parameter is not as expected.
> I tried on two machines.
> Machine1: bootcmdline in grub.cfg "memmap=800M$0x60bfdfff", but the result of
> "cat /proc/cmdline" changed to "memmap=800M/bin/bashx60bfdfff" after system
> booted.
>
> Machine2: bootcmdline in grub.cfg "memmap=0x77ffffff$0x880000000", the result of
> "cat /proc/cmdline" changed to "memmap=0x77ffffffx880000000".
>
> I didn't find the root cause, I think maybe grub reserved "$0" as something
> special.
> Replace '$' with '%' in kernel boot parameter can fix this issue.
NAK for the reasons already discussed.
-hpa
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WARNING: multiple messages have this Message-ID (diff)
From: "H. Peter Anvin" <hpa@zytor.com>
To: Bob Liu <lliubbo@gmail.com>
Cc: linux-kernel@vger.kernel.org, akpm@linux-foundation.org,
hpa@linux.intel.com, yinghai@kernel.org, jacob.shin@amd.com,
konrad.wilk@oracle.com, linux-mm@kvack.org,
Bob Liu <bob.liu@oracle.com>
Subject: Re: [PATCH] x86: e820: fix memmap kernel boot parameter
Date: Fri, 30 Aug 2013 13:39:48 -0700 [thread overview]
Message-ID: <52210314.4080408@zytor.com> (raw)
In-Reply-To: <1377841673-17361-1-git-send-email-bob.liu@oracle.com>
On 08/29/2013 10:47 PM, Bob Liu wrote:
> Kernel boot parameter memmap=nn[KMG]$ss[KMG] is used to mark specific memory as
> reserved. Region of memory to be used is from ss to ss+nn.
>
> But I found the action of this parameter is not as expected.
> I tried on two machines.
> Machine1: bootcmdline in grub.cfg "memmap=800M$0x60bfdfff", but the result of
> "cat /proc/cmdline" changed to "memmap=800M/bin/bashx60bfdfff" after system
> booted.
>
> Machine2: bootcmdline in grub.cfg "memmap=0x77ffffff$0x880000000", the result of
> "cat /proc/cmdline" changed to "memmap=0x77ffffffx880000000".
>
> I didn't find the root cause, I think maybe grub reserved "$0" as something
> special.
> Replace '$' with '%' in kernel boot parameter can fix this issue.
NAK for the reasons already discussed.
-hpa
next prev parent reply other threads:[~2013-08-30 20:40 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-30 5:47 [PATCH] x86: e820: fix memmap kernel boot parameter Bob Liu
2013-08-30 5:47 ` Bob Liu
2013-08-30 6:14 ` Dan Aloni
2013-08-30 6:14 ` Dan Aloni
2013-08-30 6:15 ` Bob Liu
2013-08-30 6:15 ` Bob Liu
2013-08-30 20:39 ` H. Peter Anvin [this message]
2013-08-30 20:39 ` H. Peter Anvin
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