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[209.85.218.44]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b7654fd4e51sm267862566b.42.2025.11.20.10.58.31 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 20 Nov 2025 10:58:31 -0800 (PST) Received: by mail-ej1-f44.google.com with SMTP id a640c23a62f3a-b737cd03d46so180828766b.0 for ; Thu, 20 Nov 2025 10:58:31 -0800 (PST) X-Forwarded-Encrypted: i=1; AJvYcCVY/XuVCo19IxtRQCWrXaE3n4WoHj5xd3v2r73V8L9rj0xtgMrDWKz1BRxb/RCoN5Q6VNBkw3CPcw==@kvack.org X-Received: by 2002:a17:907:3e88:b0:b72:5e2c:9e97 with SMTP id a640c23a62f3a-b7654eb7855mr481937666b.36.1763665110822; Thu, 20 Nov 2025 10:58:30 -0800 (PST) MIME-Version: 1.0 References: <3f4ec3be-0725-43cc-a75b-72549ebdc5c9@suse.cz> In-Reply-To: <3f4ec3be-0725-43cc-a75b-72549ebdc5c9@suse.cz> From: Linus Torvalds Date: Thu, 20 Nov 2025 10:58:13 -0800 X-Gmail-Original-Message-ID: X-Gm-Features: AWmQ_bnXRJB7OGnPui1Z4ccG7blx19W2ApcIFrrcmWTiLhd4AWJeKZTq1fmdnl4 Message-ID: Subject: Re: [GIT PULL] slab fix for 6.18-rc7 To: Vlastimil Babka Cc: Andrew Morton , Harry Yoo , David Rientjes , Christoph Lameter , Roman Gushchin , "linux-mm@kvack.org" , LKML , Christoph Hellwig Content-Type: text/plain; charset="UTF-8" X-Stat-Signature: 9iyz1xugk5e6nrgawy1kptzbrm8y8ubm X-Rspam-User: X-Rspamd-Queue-Id: 7AC2180012 X-Rspamd-Server: rspam10 X-HE-Tag: 1763665113-650805 X-HE-Meta: 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 UDrX3xp/ 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 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: List-Subscribe: List-Unsubscribe: On Thu, 20 Nov 2025 at 10:45, Vlastimil Babka wrote: > > * Fix mempool poisoning order>0 pages with CONFIG_HIGHMEM (Vlastimil Babka) I've pulled this, but honestly, CONFIG_HIGHMEM should be considered a dying breed, and I'd have been happier with just not adding extra code for that thing. Seriously, CONFIG_HIGHMEM is legacy x86 computers and embedded - old - arm stuff. Fixing debug code for this is simply not worth it. Nobody does actual kernel debugging on those platforms. It already skips poisoning for *much* more important cases, I really think the whole CONFIG_SLUB_DEBUG_ON could have been conditional on !CONFIG_HIGHMEM. In fact, not just SLUB_DEBUG_ON. I suspect *all* of SLUB_DEBUG could be disabled for non-highmem cases, but I guess that right now it's only CONFIG_SLUB_DEBUG_ON that triggers this situation anyway. We will literally get rid of CONFIG_HIGHMEM entirely at some point, but before we finally get to that point, I think we might as well at least limit the pain. Because HIGHMEM has always been just that: pain. Let's not add to it any more. Linus