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h=Date:From:To:Cc:Subject:In-Reply-To:References; b=drUnlP/gTpTNJGf3kSPuQsBGCK6KUDTIbN8ppYNrzSy4mH9fLmZBTM2YFav9YRT7A umgV2laiKooA58w9Td7kAuFj003uCbfsViLfF/Wp7D5bsBXTJj9XKBn+mZzOLmPnju NPUMhrljboSYiUJ+cWnZ8RkXY9ebJit2KojBiuGY= Date: Mon, 27 Jul 2026 15:53:56 -0700 From: Andrew Morton To: Mike Rapoport Cc: Muchun Song , Pratyush Yadav , David Hildenbrand , Pasha Tatashin , Alexander Graf , Oscar Salvador , Jason Miu , Jork Loeser , kexec@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Muchun Song Subject: Re: [PATCH v4 16/21] mm/mm_init: simplify deferred_free_pages() migratetype init Message-Id: <20260727155356.2b2d39657d1154f9400e69ea@linux-foundation.org> In-Reply-To: References: <20260725172133.4018491-1-pratyush@kernel.org> <20260725172133.4018491-17-pratyush@kernel.org> <20260726202522.e55861cc87fc3e0c6d030e1f@linux-foundation.org> <92E24479-07A8-4998-9607-87420A8BE04E@linux.dev> 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: rspam12 X-Rspamd-Queue-Id: 0C4E980002 X-Stat-Signature: on99cxuaexz1wexkaqdhqaksy1pqcu8h X-Rspam-User: X-HE-Tag: 1785192837-458527 X-HE-Meta: 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 /qAk6JUy NKiCxWFNRsNekQGjMqggMjAO7tGla6+T6PHScslsyIkEi3aGujctjvgnS46Puq6e+C5JqkVKQ4eeil6cl7OLy7fWrQExQ+4UExAOyR/pGiWdQHhQ7q+ia9msLu8HHlOBwGR8WxmLJjNUSJSM8bxPst88dTsg5JYCPmeXOaN1M7AEZl9PQwZzvu0j3YDkAZCBwlECXyddupgcSC0Fy1ehz+Yeua62N0eaGdw6ooXsd5OHDooLZaViBZYrXrRGnZz/7nSZNWbUM1cmVqRt16c/YT9vvXqSuX22cxRoJ2H5xuiiE/KJELHx81cf2o1hmCl7ZufxCU4CBFo7pXEMQqyDB23Ao7ZjgDoQc1B1LCQAubiNlyF2B2VJKSyPDaoSTUtHRAmubF7nCwZL+7TbU7IQ5OdJ4Ww== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, 27 Jul 2026 13:08:18 +0300 Mike Rapoport wrote: > On Mon, Jul 27, 2026 at 11:43:31AM +0800, Muchun Song wrote: > > > > > > > On Jul 27, 2026, at 11:25, Andrew Morton wrote: > > > > > > On Sun, 26 Jul 2026 13:16:54 +0300 Mike Rapoport wrote: > > > > > >> On Sat, Jul 25, 2026 at 07:21:16PM +0200, Pratyush Yadav wrote: > > >>> From: Muchun Song > > >>> > > >>> deferred_free_pages() open-codes two loops to initialize the pageblock > > >>> migratetype for a range of pages. > > >>> > > >>> Replace them with pageblock_migratetype_init_range() to remove the > > >>> duplication and make the code clearer (Note that deferred_free_pages() may > > >>> be called from atomic context). > > >>> > > >>> Link: https://lore.kernel.org/20260612035903.2468601-6-songmuchun@bytedance.com > > >>> Signed-off-by: Muchun Song > > >>> Acked-by: Mike Rapoport (Microsoft) > > >>> Acked-by: Oscar Salvador > > >>> Signed-off-by: Pratyush Yadav (Google) > > >>> --- > > >>> > > >>> Notes: > > >>> This patch is taken from Muchun's series [0]. The patch as of today is > > >>> in mm-unstable. > > >> > > >> @Andrew, > > >> > > >> It looks like it'll take some time for this patch to get into mm-stable so > > >> we can't base this work on a branch in the mm tree :( > > > > > > I didn't know anyone was using mm-stable :( > > Maybe nobody uses it because it's not really stable? ;-) Well it's supposed to be. Rebases are rare. The larger problem is that it doesn't contain anything until -rc5ish because we haven't stabilized anything yet! > > I'd like to confirm that this is a completely independent cleanup patch, > > so it can be merged on its own. > > That's great, thanks for confirming! > > Then I think the easiest would be to take "mm/mm_init: simplify > deferred_free_pages() migratetype init" via liveupdate tree. No probs, I'll drop it when Mark reports the duplicate.