[PATCH] jump_label: align jump_entry table to at least 4-bytes
ddaney at caviumnetworks.com
Tue Feb 28 10:34:44 AEDT 2017
On 02/27/2017 02:50 PM, Jason Baron wrote:
> 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 at caviumnetworks.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
>> 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.
If there are problems, you could try something like:
$ find . -name \*\.o | xargs mips64-octeon-linux-gnu-readelf -eW | grep
 __jump_table PROGBITS 0000000000000000 1838c8
0022c8 18 WAM 0 0 8
 __jump_table PROGBITS 0000000000000000 008cb0 000048
18 WAM 0 0 8
Look for files where the size of the __jump_table section is not a
integer multiple of the entsize.
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