linux-kernel - Re: Why exported const value modified by another driver not updated in original driver

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Message-ID: <20120904114618.62a1d89e@pyramind.ukuu.org.uk>
Date:	Tue, 4 Sep 2012 11:46:18 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Manavendra Nath Manav <mnm.kernel@...il.com>
Cc:	kernelnewbies@...nelnewbies.org, linux-kernel@...r.kernel.org
Subject: Re: Why exported const value modified by another driver not updated
 in original driver

On Tue, 4 Sep 2012 15:00:16 +0530
Manavendra Nath Manav <mnm.kernel@...il.com> wrote:

> Hi,
> 
> I have declared a static const int variable in one driver and exported
> that variable symbol. In another driver i am modifying that variable.
> The other driver prints the modified value but the original driver
> retains the original value. When both virtual and physical addresses
> of the variable as seen by both drivers are same, how is this even
> possible. Is it a kernel bug?

It's const, why is it even a surprise. If you don't understand what is
going on then I suggest you disassemble the code. That will I think let
you understand what is going on.

Alan
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