linux-kernel - Re: Split 'flush_old_exec' into two functions - 221af7f87b97431e3ee21ce4b0e77d5411cf1549

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Message-ID: <4B672C31.9070302@zytor.com>
Date:	Mon, 01 Feb 2010 11:32:01 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Michal Simek <michal.simek@...alogix.com>,
	LKML <linux-kernel@...r.kernel.org>,
	John Williams <john.williams@...alogix.com>
Subject: Re: Split 'flush_old_exec' into two functions - 221af7f87b97431e3ee21ce4b0e77d5411cf1549

On 02/01/2010 07:57 AM, Linus Torvalds wrote:
> 
> That said, Microblaze is not one of the architectures I would have 
> expected to have problems. It has one of the most straightforward 
> "flush_thread()" implementations in the whole kernel (it's a no-op ;), and 
> that's where most of the hacky things were for the architectures that 
> needed the change. And it has no "arch_pick_mmap_layout()" issues or 
> anything else that tends to depend on personality bits or whatever.
> 
> Microblaze is a no-MMU platform, isn't it? Which binary format does it 
> use? It looks like _some_ binaries work (it seems to happily be running a 
> shell to actually do those startup scripts) while others have problems. Is 
> there a difference between "/bin/sh" and the binaries that seem to be 
> problematic (like /bin/mount and /bin/ifup).
> 
> Are the failing binaries all setuid ones, for example? Or shared vs 
> non-shared? Or ELF vs FLAT or whatever?
> 

Another thing... it looks like you [Michal] is running a test image
under Qemu... could you perhaps point us to that image or another test
image which reproduces the problem?

Nothing like having a hands-on testcase...

	-hpa

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