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Received: from willy by casper.infradead.org with local (Exim 4.98.2 #2 (Red Hat Linux)) id 1w3L54-00000006k3I-3VIq; Thu, 19 Mar 2026 21:39:02 +0000 Date: Thu, 19 Mar 2026 21:39:02 +0000 From: Matthew Wilcox To: Brendan Jackman Cc: Andrew Morton , Michal Hocko , David Rientjes , Shakeel Butt , Vlastimil Babka , Suren Baghdasaryan , Johannes Weiner , Zi Yan , Harry Yoo , Hao Li , Christoph Lameter , Roman Gushchin , Uladzislau Rezki , linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH 0/5] mm: Switch gfp_t to unsigned long Message-ID: References: <20260319-gfp64-v1-0-2c73b8d42b7f@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 8C87240010 X-Stat-Signature: 9kxegmrah64nhtkpj5moaaw89ho99him X-Rspam-User: X-HE-Tag: 1773956349-646435 X-HE-Meta: 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Mar 19, 2026 at 06:40:59PM +0000, Brendan Jackman wrote: > I will paste the diff at the bottom. I _think_ all the problematic > expansions are downstream of struct xarray, but it's quite likely my > sense for problematic struct expansions is weak. Urgh, no, it's not all xarray. There's one in address_space which we're trying to shrink, not grow. There's one in struct sock too. I don't think this idea is worth it. There are other projects of greater or lesser churniess which will give us some flags back. For example, we could finish the GFP_NOFS and GFP_NOIO removal. We could finish the radix_tree -> XArray removal and get back three bits. That's five bits without even starting new projects, just finishing old ones.