linux-kernel - Re: [stable] [3/3] powerpc: rtas_flash needs to use rtas_data

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Message-ID: <20110321214501.GB9546@kroah.com>
Date:	Mon, 21 Mar 2011 14:45:01 -0700
From:	Greg KH <greg@...ah.com>
To:	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
Cc:	mananth@...ibm.com, benh@...nel.crashing.org, stable@...nel.org,
	anton@...ba.org, linux-kernel@...r.kernel.org
Subject: Re: [stable] [3/3] powerpc: rtas_flash needs to use rtas_data_buf

On Sat, Mar 19, 2011 at 11:46:58PM +0530, Kamalesh Babulal wrote:
>     powerpc: rtas_flash needs to use rtas_data_buf
> 
> 	Commit: bd2b64a12bf55bec0d1b949e3dca3f8863409646 upstream
> 
>     When trying to flash a machine via the update_flash command, Anton received the
>     following error:
> 
>         Restarting system.
>         FLASH: kernel bug...flash list header addr above 4GB
> 
>     The code in question has a comment that the flash list should be in
>     the kernel data and therefore under 4GB:
> 
>             /* NOTE: the "first" block list is a global var with no data
>              * blocks in the kernel data segment.  We do this because
>              * we want to ensure this block_list addr is under 4GB.
>              */
> 
>     Unfortunately the Kconfig option is marked tristate which means the variable
>     may not be in the kernel data and could be above 4GB.
> 
>     Instead of relying on the data segment being below 4GB, use the static
>     data buffer allocated by the kernel for use by rtas.  Since we don't
>     use the header struct directly anymore, convert it to a simple pointer.
> 
>     Reported-By: Anton Blanchard <anton@...ba.org>
>     Signed-off-by: Milton Miller <miltonm@....com
>     Tested-By: Anton Blanchard <anton@...ba.org>
>     Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> 	Signed-off-by: Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
> ---
> arch/powerpc/kernel/rtas_flash.c |   41 ++++++++++++++++++++-----------------
>  1 files changed, 22 insertions(+), 19 deletions(-)

This diffstat differs from what the original commit had:
 arch/powerpc/kernel/rtas_flash.c |   39 +++++++++++++++++++++------------------
 1 file changed, 21 insertions(+), 18 deletions(-)

So I went with the original commit, ok?

Why are you diverging from the original?

thanks,

greg k-h
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