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Received: from willy by casper.infradead.org with local (Exim 4.97.1 #2 (Red Hat Linux)) id 1sLorU-0000000ALgu-2jlA; Mon, 24 Jun 2024 18:56:20 +0000 Date: Mon, 24 Jun 2024 19:56:20 +0100 From: Matthew Wilcox To: Yosry Ahmed Cc: kernel test robot , Usama Arif , oe-lkp@lists.linux.dev, lkp@intel.com, Linux Memory Management List , Andrew Morton , Chengming Zhou , Nhat Pham , David Hildenbrand , "Huang, Ying" , Hugh Dickins , Johannes Weiner , Shakeel Butt , Andi Kleen , linux-kernel@vger.kernel.org Subject: Re: [linux-next:master] [mm] 0fa2857d23: WARNING:at_mm/page_alloc.c:#__alloc_pages_noprof Message-ID: References: <202406241651.963e3e78-oliver.sang@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 4C36240016 X-Stat-Signature: yf81m7ikp8nr3w41fyzj1tm9f51xczzt X-Rspam-User: X-HE-Tag: 1719255383-941473 X-HE-Meta: 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 AHax8HtI /6tjpBHnof2+7XB+JZNOKR0BW0mBok76LzlzcjmGEcHGoe/K3b9VPoecaffUbMpvVMRYMJloKdRLCwsp1YeThZiz3eLdGu7Dum63zI2Sltdq5hlSyfZ6l586zx3KFW8sVaV18xafUhVbhTnlyfx61gkNkEjc8t5rU1UCCrTOrI0eV0CsljcLIryCy0noUobC9/HZNs9t/e9KLQxJQyQLVcCdz3ZpTPap1OCQQO7Jgi7qirw8jehJKeGLP8R0lbK8FGNsG 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 Mon, Jun 24, 2024 at 11:53:30AM -0700, Yosry Ahmed wrote: > After a page is swapped out during reclaim, __remove_mapping() will > call __delete_from_swap_cache() to replace the swap cache entry with a > shadow entry (which is an xa_value). Special entries are disjoint from shadow entries. Shadow entries have the last two bits as 01 or 11 (are congruent to 1 or 3 modulo 4). Special entries have values below 4096 which end in 10 (are congruent to 2 modulo 4).