linux-kernel - Re: [PATCH] nvdimm: constify device

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Message-ID: <1485360117.12563.85.camel@perches.com>
Date:   Wed, 25 Jan 2017 08:01:57 -0800
From:   Joe Perches <joe@...ches.com>
To:     Julia Lawall <julia.lawall@...6.fr>
Cc:     Dan Williams <dan.j.williams@...el.com>,
        Bhumika Goyal <bhumirks@...il.com>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...1.01.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] nvdimm: constify device_type structures

On Wed, 2017-01-25 at 07:49 +0100, Julia Lawall wrote:
> What does the data column actually represent?  I tried size on the .o file
> generated from:
> 
> commit a65f0161f4d69d6738d4821e649448312cd818e2
> Author: Stephen Rothwell <sfr@...b.auug.org.au>
> Date:   Tue Jan 17 15:22:28 2017 +1100
> 
> with CONFIG_X86_64=y and I get:
> 
>    text	   data	    bss	    dec	    hex	filename
>   19726	   3480	     16	  23222	   5ab6	drivers/nvdimm/namespace_devs.o
> 
> but when I run objdump -sh drivers/nvdimm/namespace_devs.o, I find a .data
> segment of size 1008 and a .data.unlikely segment of size 8, which don't
> match up with the results of size.

Likely you have dynamic_debug enabled and you
need to include these additional sections:

	__jump_table
	__verbose

If user_mode_linux is enabled, add sections:

	.fini_array
	.init_array