linux-kernel - Re: [PATCH 06/12] powerpc/module: Rework is_early_mcount

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Message-ID: <56CE3F25.8030100@gmail.com>
Date:	Thu, 25 Feb 2016 10:39:17 +1100
From:	Balbir Singh <bsingharora@...il.com>
To:	Michael Ellerman <mpe@...erman.id.au>, linuxppc-dev@...abs.org
Cc:	duwe@....de, linux-kernel@...r.kernel.org, rostedt@...dmis.org,
	kamalesh@...ux.vnet.ibm.com, pmladek@...e.com, jeyu@...hat.com,
	jkosina@...e.cz, live-patching@...r.kernel.org, mbenes@...e.cz
Subject: Re: [PATCH 06/12] powerpc/module: Rework is_early_mcount_callsite()


On 25/02/16 01:28, Michael Ellerman wrote:
> is_early_mcount_callsite() needs to detect either the two instruction or
> the three instruction versions of the _mcount() sequence.
>
> But if we're running a kernel with the two instruction sequence, we need
> to be careful not to read instruction - 2, otherwise we might fall off
> the front of a page and cause an oops.
>
> While we're here convert to bool to make the return semantics clear.
>
> Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
> ---
>  arch/powerpc/kernel/module_64.c | 30 ++++++++++++++----------------
>  1 file changed, 14 insertions(+), 16 deletions(-)
>
> Squash.
>
>
Do we even need to do this anymore?

Balbir Singh.