From: "H. Peter Anvin" <hpa@zytor.com>
To: Christoph Lameter <cl@linux-foundation.org>,
Matthew Wilcox <matthew@wil.cx>, Yinghai Lu <yinghai@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Rabin Vincent <rabin@rab.in>
Subject: Re: start_kernel(): bug: interrupts were enabled early
Date: Wed, 31 Mar 2010 14:57:20 -0700 [thread overview]
Message-ID: <4BB3C540.9000405@zytor.com> (raw)
In-Reply-To: <20100331215411.GB17715@flint.arm.linux.org.uk>
On 03/31/2010 02:54 PM, Russell King wrote:
> On Wed, Mar 31, 2010 at 04:42:25PM -0500, Christoph Lameter wrote:
>> Do not run the checks while we are in a single threaded context?
>>
>> I thought we had some dynamic code patching thingamy that could change
>> those when we go to smp mode?
>
> You have to remember that on embedded architectures, such as ARM,
> where XIP is supported we can't change the text segment at run time -
> which means dynamic code patching won't work.
>
> However, the kernel should still work in such situations.
>
The question still remains what the incremental cost is of doing
irqsave/irqrestore.
-hpa
WARNING: multiple messages have this Message-ID (diff)
From: "H. Peter Anvin" <hpa@zytor.com>
To: Christoph Lameter <cl@linux-foundation.org>,
Matthew Wilcox <matthew@wil.cx>, Yinghai Lu <yinghai@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Rabin Vincent <rabin@rab.in>, lkml <linux-kernel@vger.kernel.org>,
penberg@cs.helsinki.fi,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
linux-arch@vger.kernel.org
Subject: Re: start_kernel(): bug: interrupts were enabled early
Date: Wed, 31 Mar 2010 14:57:20 -0700 [thread overview]
Message-ID: <4BB3C540.9000405@zytor.com> (raw)
Message-ID: <20100331215720.T1aKALBopndxP_A1xcETqz-YBNqk9mpy-61sg049by8@z> (raw)
In-Reply-To: <20100331215411.GB17715@flint.arm.linux.org.uk>
On 03/31/2010 02:54 PM, Russell King wrote:
> On Wed, Mar 31, 2010 at 04:42:25PM -0500, Christoph Lameter wrote:
>> Do not run the checks while we are in a single threaded context?
>>
>> I thought we had some dynamic code patching thingamy that could change
>> those when we go to smp mode?
>
> You have to remember that on embedded architectures, such as ARM,
> where XIP is supported we can't change the text segment at run time -
> which means dynamic code patching won't work.
>
> However, the kernel should still work in such situations.
>
The question still remains what the incremental cost is of doing
irqsave/irqrestore.
-hpa
next prev parent reply other threads:[~2010-03-31 22:01 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20100325194100.GA2364@debian>
2010-03-31 20:40 ` start_kernel(): bug: interrupts were enabled early Andrew Morton
2010-03-31 20:47 ` Yinghai Lu
2010-03-31 20:47 ` Yinghai Lu
2010-03-31 20:52 ` Andrew Morton
2010-03-31 21:12 ` H. Peter Anvin
2010-03-31 21:28 ` Andrew Morton
2010-03-31 22:35 ` Benjamin Herrenschmidt
2010-04-01 16:13 ` Linus Torvalds
2010-04-01 14:27 ` Andrew Morton
2010-04-01 20:12 ` Linus Torvalds
2010-04-02 14:46 ` David Howells
2010-04-02 14:54 ` Linus Torvalds
2010-04-07 19:09 ` Kevin Hilman
2010-04-08 15:55 ` Américo Wang
2010-04-08 15:55 ` Américo Wang
2010-03-31 21:01 ` Matthew Wilcox
2010-03-31 21:05 ` H. Peter Anvin
2010-03-31 21:17 ` Matthew Wilcox
2010-03-31 21:42 ` Christoph Lameter
2010-03-31 21:54 ` Russell King
2010-03-31 21:57 ` H. Peter Anvin [this message]
2010-03-31 21:57 ` H. Peter Anvin
2010-03-31 22:30 ` Russell King
2010-03-31 22:37 ` Benjamin Herrenschmidt
2010-03-31 22:49 ` Andrew Morton
2010-04-01 1:17 ` Benjamin Herrenschmidt
2010-03-31 22:26 ` Andrew Morton
2010-04-01 6:26 ` H. Peter Anvin
2010-04-01 3:33 ` Andrew Morton
2010-04-01 6:48 ` Benjamin Herrenschmidt
2010-04-01 11:06 ` David Howells
2010-04-01 15:55 ` Christoph Lameter
2010-04-01 23:00 ` Benjamin Herrenschmidt
2010-04-01 16:15 ` H. Peter Anvin
2010-04-01 16:15 ` H. Peter Anvin
2010-04-01 6:50 ` Benjamin Herrenschmidt
2010-03-31 22:36 ` Benjamin Herrenschmidt
2010-04-01 15:57 ` Christoph Lameter
2010-03-31 21:05 ` Russell King
2010-03-31 21:05 ` Russell King
2010-03-31 21:08 ` H. Peter Anvin
2010-03-31 21:08 ` H. Peter Anvin
2010-03-31 22:58 ` David Howells
2010-04-01 9:41 ` Jamie Lokier
2010-04-01 10:50 ` David Howells
2010-04-01 11:23 ` Matthew Wilcox
2010-03-31 22:31 ` Benjamin Herrenschmidt
2010-03-31 22:36 ` H. Peter Anvin
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