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Shutemov" , John Hubbard , David Rientjes , Vlastimil Babka , Hugh Dickins , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org Subject: Re: [PATCH v6 4/9] mm: thp: Introduce anon_orders and anon_always_mask sysfs files Message-Id: <20231009172029.e558c08dd90d9b94fec3a036@linux-foundation.org> In-Reply-To: <87fs2mrqld.fsf@mail.lhotse> References: <20230929114421.3761121-1-ryan.roberts@arm.com> <20230929114421.3761121-5-ryan.roberts@arm.com> <20230929155530.a51e68e03e47a06b6b84c689@linux-foundation.org> <87fs2mrqld.fsf@mail.lhotse> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: C8CA11C0011 X-Stat-Signature: ofw6m1atuth7ru4ikdye3rbeigh44xp5 X-Rspam-User: X-HE-Tag: 1696897266-99798 X-HE-Meta: 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 iSgZDVPm eii2eAwl4tWpLDxRjBo5zUZowimDrMEf566XDrEN290ZF7k4Rnuid9BD5q8tnAMcAlOlRw3gqqwpDWa3mu1G9pbnjXl0bJAMTQOvU8n+inylkbxn4E2ebnODLwhO2zQbXDE9k9XSclTNqIBuSmsuNjqUvnbr0T5gNUaGOdzLFJlqKntPh7/MnLKR+ln7eNAXx30zWZloPZ0B6IzCKp7mTNBylKpMQsenZ6hbWEC7sKq7gWwJG9GVqUfpdXbvtYFFZjJqA9HqLzDxNHoZaClpm1bya82vZrfictObZ4JmVmK0e6Fj1pwil3ojeJF969pGcb2qVQvjN1/kbRYwbQQIUM0x5n4D55TwKx5OX0YDdW+G6o5k= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Sun, 08 Oct 2023 09:54:22 +1100 Michael Ellerman wrote: > > I don't know why powerpc's PTE_INDEX_SIZE is variable. > > To allow a single vmlinux to boot using either the Hashed Page Table > MMU, or Radix Tree MMU, which have different page table geometry. > > That's a pretty crucial feature for distros, so that they can build a > single kernel to boot on Power8/9/10. Dumb question: why can't distros ship two kernels and have the boot loader (or something else) pick the appropriate one?