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Peter Anvin" , Andrew Morton , Dimitri Sivanich , Russ Anderson , Andrew Banman , jgross@suse.com, dan.j.williams@intel.com, mhocko@suse.com, kirill.shutemov@linux.intel.com, x86@kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: Re: [PATCH 1/3] x86/platform/UV: Add adjustable set memory block size function Message-ID: <20180511052448.GE2902@kroah.com> References: <20180510231832.035433756@stormcage.americas.sgi.com> <20180510231832.201546912@stormcage.americas.sgi.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180510231832.201546912@stormcage.americas.sgi.com> User-Agent: Mutt/1.9.5 (2018-04-13) Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: On Thu, May 10, 2018 at 06:18:33PM -0500, mike.travis@hpe.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 > Reviewed-by: Andrew Banman > --- > arch/x86/mm/init_64.c | 20 ++++++++++++++++---- > include/linux/memory.h | 1 + > 2 files changed, 17 insertions(+), 4 deletions(-) > 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.