linux-kernel - Re: [PATCH] module: set __jump

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Date:   Thu, 2 Mar 2017 10:30:50 -0500
From:   Jason Baron <jbaron@...mai.com>
To:     David Daney <david.daney@...ium.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Sachin Sant <sachinp@...ux.vnet.ibm.com>,
        linux-kernel@...r.kernel.org
Cc:     linux-mips@...ux-mips.org, linuxppc-dev@...ts.ozlabs.org,
        linux-arm-kernel@...ts.infradead.org,
        Chris Metcalf <cmetcalf@...lanox.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Russell King <linux@...linux.org.uk>,
        Rabin Vincent <rabin@....in>,
        Paul Mackerras <paulus@...ba.org>,
        Anton Blanchard <anton@...ba.org>,
        Ingo Molnar <mingo@...nel.org>, Zhigang Lu <zlu@...hip.com>
Subject: Re: [PATCH] module: set __jump_table alignment to 8

On 03/01/2017 05:04 PM, David Daney wrote:
> For powerpc the __jump_table section in modules is not aligned, this
> causes a WARN_ON() splat when loading a module containing a __jump_table.
>
> Strict alignment became necessary with commit 3821fd35b58d
> ("jump_label: Reduce the size of struct static_key"), currently in
> linux-next, which uses the two least significant bits of pointers to
> __jump_table elements.
>
> Fix by forcing __jump_table to 8, which is the same alignment used for
> this section in the kernel proper.
>
> Signed-off-by: David Daney <david.daney@...ium.com>
> Tested-by: Sachin Sant <sachinp@...ux.vnet.ibm.com>
> ---

Looks good to me.

Reviewed-by: Jason Baron <jbaron@...mai.com>

Thanks,

-Jason