linux-kernel - Re: [PATCH] jump_label: align jump

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Date:   Mon, 27 Feb 2017 17:50:25 -0500
From:   Jason Baron <jbaron@...mai.com>
To:     David Daney <ddaney@...iumnetworks.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sachin Sant <sachinp@...ux.vnet.ibm.com>
Cc:     linux-mips@...ux-mips.org, Ralf Baechle <ralf@...ux-mips.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, Ingo Molnar <mingo@...nel.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Anton Blanchard <anton@...ba.org>,
        Rabin Vincent <rabin@....in>,
        Russell King <linux@...linux.org.uk>,
        Chris Metcalf <cmetcalf@...lanox.com>,
        Zhigang Lu <zlu@...hip.com>
Subject: Re: [PATCH] jump_label: align jump_entry table to at least 4-bytes



On 02/27/2017 05:45 PM, David Daney wrote:
> On 02/27/2017 02:36 PM, Steven Rostedt wrote:
>> On Mon, 27 Feb 2017 14:21:21 -0800
>> David Daney <ddaney@...iumnetworks.com> wrote:
>>
>>> See attached for mips.  It seems to do the right thing.
>>>
>>> I leave it as an exercise to the reader to fix the other architectures.
>>>
>>> Consult your own  binutils experts to verify that what I say is true.
>>
>> It may still just be safer to do the pointers instead. That way we
>> don't need to worry about some strange arch or off by one binutils
>> messing it up.
>
> Obviously it is your choice, but this is bog standard ELF linking.  In
> theory even the arrays of power-of-2 sized objects should also supply an
> entity size.  Think __ex_table and its ilk.
>
>
> The benefit of supplying an entsize is that you don't have to change the
> structure of the existing code and risk breaking something in the process.
>
> David Daney
>
>

Thanks for the suggestion! I would like to see if this resolves the ppc 
issue we had. I'm attaching a powerpc patch based on your suggestion. 
Hopefully, Sachin can try it.

Thanks,

-Jason

View attachment "ppc-pack.patch" of type "text/x-patch" (1976 bytes)