linux-kernel - Re: [PATCH 1/3] x86/platform/UV: Add adjustable set memory block size function

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Message-ID: <20180511052448.GE2902@kroah.com>
Date:   Fri, 11 May 2018 07:24:48 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     mike.travis@....com
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dimitri Sivanich <dimitri.sivanich@....com>,
        Russ Anderson <russ.anderson@....com>,
        Andrew Banman <andrew.banman@....com>, jgross@...e.com,
        dan.j.williams@...el.com, mhocko@...e.com,
        kirill.shutemov@...ux.intel.com, x86@...nel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 1/3] x86/platform/UV: Add adjustable set memory block
 size function

On Thu, May 10, 2018 at 06:18:33PM -0500, mike.travis@....com wrote:
> Add a new function to "adjust" the current fixed UV memory block size of
> 2GB so it can be changed to a different physical boundary.  This is out
> of necessity so UV BIOS can accommodate Intel BIOS changes for NVDIMM's,
> which can align these new PMEM modules at other than 2GB boundaries.
> 
> A "set order" type of function was used to insure that the memory block
> size will be a power of two value without requiring a validity check on
> the size value passed in.  64GB was chosen as the upper limit for memory
> block size values to accommodate upcoming 4PB systems which have 6 more
> bits of physical address space (46 becoming 52).
> 
> Signed-off-by: Mike Travis <mike.travis@....com>
> Reviewed-by: Andrew Banman <andrew.banman@....com>
> ---
>  arch/x86/mm/init_64.c  |   20 ++++++++++++++++----
>  include/linux/memory.h |    1 +
>  2 files changed, 17 insertions(+), 4 deletions(-)
> 

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>