linux-kernel - Re: [v3,1/8] powerpc: Create a helper for getting the kernel toc value

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Message-ID: <20160317155928.GB32575@lst.de>
Date:	Thu, 17 Mar 2016 16:59:28 +0100
From:	Torsten Duwe <duwe@....de>
To:	Balbir Singh <bsingharora@...il.com>
Cc:	Jiri Kosina <jikos@...nel.org>,
	Michael Ellerman <mpe@...erman.id.au>, linuxppc-dev@...abs.org,
	pmladek@...e.com, jeyu@...hat.com, linux-kernel@...r.kernel.org,
	rostedt@...dmis.org, kamalesh@...ux.vnet.ibm.com,
	live-patching@...r.kernel.org, mbenes@...e.cz
Subject: Re: [v3,1/8] powerpc: Create a helper for getting the kernel toc
	value

On Thu, Mar 17, 2016 at 10:58:42AM +1100, Balbir Singh wrote:
> 
> To be honest I think my v6 works well, but I don't have complete confidence
> due to the lack of proper testing. livepatch samples plus some others I wrote
> and I one Petr wrote all work (calling patched from within patched),

I have outlined a failure scenario for you as a reply to v6 ;)

Question to all: would it be feasible to limit the size of a single module's
.text + TOC to let's say 8MB, and place modules at 10MB granularity? Then it
would be unambiguous: exactly iff the high 40 bits of (TOC-LR) are zero, both
belong to the same module.

	Torsten