From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.10]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 77CC04A92F4; Wed, 2 Sep 2026 15:38:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.10 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788363517; cv=none; b=m47SDtneZjSkheggUS5HwprD5bMH/E3Rp26orKnwpsN30R1T3XYySF9/bKpm/AWknyE4ECVIsLAuDqMQD0Kj40ylx4v8CCyjMDNvo/6BrKcsSuVeq0K+ct7OilVG5mPlunE0U/pnPPdJ0+IlcAc1VS5XozYo5A7fhk+c1xAKmfc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788363517; c=relaxed/simple; bh=Gto3Qh9GMb9NHfU1pyqgYrGFpm2eBmgKaVe1oFr7GaI=; h=Content-Type:Message-ID:Date:MIME-Version:Subject:To:Cc: References:From:In-Reply-To; b=BmONIZ4hW/WikwCZG0+NkU30HBr2QTr7Vs9FQwrjjmRy4yNekKPnHE4GE7cTDi+hb1f1AG50hm9pgu16aHZgws3AUdsC0Ci1Lw+xrCe1wlnrCCt6IQSJuyLyfFupybGuHDNoCOOu/4yXSylko2WRagCIVltdmRQv8MZhOdxDKFY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=mZxm38cb; arc=none smtp.client-ip=192.198.163.10 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="mZxm38cb" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1788363506; x=1819899506; h=message-id:date:mime-version:subject:to:cc:references: from:in-reply-to; bh=Gto3Qh9GMb9NHfU1pyqgYrGFpm2eBmgKaVe1oFr7GaI=; b=mZxm38cbMefr0FfHt390kK9ivo3jcTPAi3l4OMk8XRoTt6eI6bqnA791 f+qXWmjscQDOfLiJunmjHO1CTZhTS5Kj+3mpDcEVNgqI1ui2LoTKr8HHX BeqAZ6PEeAa1fkQml5dqk/T5m8BVOwxuwWrr6xyY41lgFuyZxUUxHRKUf Gvvy+g/RiqnhKlJYpqo0ZMRSZNBCNtosFFrQu5rFFUPSCr0EswoyCfzem YlZ7rWQpHGNLgqAeL1OSEI0s9zC8BqSsWk1Ob5SfhXAvjj3gvJ6iz/XDg QrBwKxehof/3YCsEf/bpLwgDQ9fMxgGadNu0ZvoQcn5+LJtKR7MCF6bRJ w==; X-CSE-ConnectionGUID: z8NhbtPhRx+tPb+lgB/BGw== X-CSE-MsgGUID: 7x/IjhW2T4eKuJ7IAtw8Bg== X-IronPort-AV: E=McAfee;i="6800,10657,11894"; a="100180360" X-IronPort-AV: E=Sophos;i="6.25,258,1779174000"; d="scan'208";a="100180360" Received: from orviesa010.jf.intel.com ([10.64.159.150]) by fmvoesa104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Sep 2026 08:38:14 -0700 X-CSE-ConnectionGUID: 8hpX5srJT06kHQYkOTw48Q== X-CSE-MsgGUID: me7HS4XpTWOWoZkBSbYO+w== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.25,258,1779174000"; d="scan'208";a="268126784" Received: from cjhill-mobl.amr.corp.intel.com (HELO [10.125.110.134]) ([10.125.110.134]) by orviesa010-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Sep 2026 08:38:13 -0700 Content-Type: multipart/mixed; boundary="------------4S7eK5PTldGor8W3n9zFHezW" Message-ID: Date: Wed, 2 Sep 2026 08:38:12 -0700 Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC v3 15/21] x86: mm: skip collapse_pud_page() when CONFIG_X86_DIRECT_GBPAGES disabled To: Yeoreum Yun , Russell King , Huacai Chen , WANG Xuerui , Thomas Bogendoerfer , Catalin Marinas , Will Deacon , Arnd Bergmann , Andrew Morton , Kairui Song , Qi Zheng , Shakeel Butt , Barry Song , Axel Rasmussen , Yuanchu Xie , Wei Xu , Johannes Weiner , David Hildenbrand , Michal Hocko , Lorenzo Stoakes , Tianrui Zhao , Bibo Mao , Anup Patel , Atish Patra , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Jonas Bonn , Stefan Kristiansson , Stafford Horne Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-openrisc@vger.kernel.org References: <20260902-dummy_ptxp3-v3-0-5d8f5b17c25c@arm.com> <20260902-dummy_ptxp3-v3-15-5d8f5b17c25c@arm.com> From: Dave Hansen Content-Language: en-US Autocrypt: addr=dave.hansen@intel.com; keydata= xsFNBE6HMP0BEADIMA3XYkQfF3dwHlj58Yjsc4E5y5G67cfbt8dvaUq2fx1lR0K9h1bOI6fC oAiUXvGAOxPDsB/P6UEOISPpLl5IuYsSwAeZGkdQ5g6m1xq7AlDJQZddhr/1DC/nMVa/2BoY 2UnKuZuSBu7lgOE193+7Uks3416N2hTkyKUSNkduyoZ9F5twiBhxPJwPtn/wnch6n5RsoXsb ygOEDxLEsSk/7eyFycjE+btUtAWZtx+HseyaGfqkZK0Z9bT1lsaHecmB203xShwCPT49Blxz VOab8668QpaEOdLGhtvrVYVK7x4skyT3nGWcgDCl5/Vp3TWA4K+IofwvXzX2ON/Mj7aQwf5W iC+3nWC7q0uxKwwsddJ0Nu+dpA/UORQWa1NiAftEoSpk5+nUUi0WE+5DRm0H+TXKBWMGNCFn c6+EKg5zQaa8KqymHcOrSXNPmzJuXvDQ8uj2J8XuzCZfK4uy1+YdIr0yyEMI7mdh4KX50LO1 pmowEqDh7dLShTOif/7UtQYrzYq9cPnjU2ZW4qd5Qz2joSGTG9eCXLz5PRe5SqHxv6ljk8mb ApNuY7bOXO/A7T2j5RwXIlcmssqIjBcxsRRoIbpCwWWGjkYjzYCjgsNFL6rt4OL11OUF37wL QcTl7fbCGv53KfKPdYD5hcbguLKi/aCccJK18ZwNjFhqr4MliQARAQABzUVEYXZpZCBDaHJp c3RvcGhlciBIYW5zZW4gKEludGVsIFdvcmsgQWRkcmVzcykgPGRhdmUuaGFuc2VuQGludGVs LmNvbT7CwXgEEwECACIFAlQ+9J0CGwMGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJEGg1 lTBwyZKwLZUP/0dnbhDc229u2u6WtK1s1cSd9WsflGXGagkR6liJ4um3XCfYWDHvIdkHYC1t MNcVHFBwmQkawxsYvgO8kXT3SaFZe4ISfB4K4CL2qp4JO+nJdlFUbZI7cz/Td9z8nHjMcWYF IQuTsWOLs/LBMTs+ANumibtw6UkiGVD3dfHJAOPNApjVr+M0P/lVmTeP8w0uVcd2syiaU5jB aht9CYATn+ytFGWZnBEEQFnqcibIaOrmoBLu2b3fKJEd8Jp7NHDSIdrvrMjYynmc6sZKUqH2 I1qOevaa8jUg7wlLJAWGfIqnu85kkqrVOkbNbk4TPub7VOqA6qG5GCNEIv6ZY7HLYd/vAkVY E8Plzq/NwLAuOWxvGrOl7OPuwVeR4hBDfcrNb990MFPpjGgACzAZyjdmYoMu8j3/MAEW4P0z F5+EYJAOZ+z212y1pchNNauehORXgjrNKsZwxwKpPY9qb84E3O9KYpwfATsqOoQ6tTgr+1BR CCwP712H+E9U5HJ0iibN/CDZFVPL1bRerHziuwuQuvE0qWg0+0SChFe9oq0KAwEkVs6ZDMB2 P16MieEEQ6StQRlvy2YBv80L1TMl3T90Bo1UUn6ARXEpcbFE0/aORH/jEXcRteb+vuik5UGY 5TsyLYdPur3TXm7XDBdmmyQVJjnJKYK9AQxj95KlXLVO38lczsFNBFRjzmoBEACyAxbvUEhd GDGNg0JhDdezyTdN8C9BFsdxyTLnSH31NRiyp1QtuxvcqGZjb2trDVuCbIzRrgMZLVgo3upr MIOx1CXEgmn23Zhh0EpdVHM8IKx9Z7V0r+rrpRWFE8/wQZngKYVi49PGoZj50ZEifEJ5qn/H Nsp2+Y+bTUjDdgWMATg9DiFMyv8fvoqgNsNyrrZTnSgoLzdxr89FGHZCoSoAK8gfgFHuO54B lI8QOfPDG9WDPJ66HCodjTlBEr/Cwq6GruxS5i2Y33YVqxvFvDa1tUtl+iJ2SWKS9kCai2DR 3BwVONJEYSDQaven/EHMlY1q8Vln3lGPsS11vSUK3QcNJjmrgYxH5KsVsf6PNRj9mp8Z1kIG qjRx08+nnyStWC0gZH6NrYyS9rpqH3j+hA2WcI7De51L4Rv9pFwzp161mvtc6eC/GxaiUGuH BNAVP0PY0fqvIC68p3rLIAW3f97uv4ce2RSQ7LbsPsimOeCo/5vgS6YQsj83E+AipPr09Caj 0hloj+hFoqiticNpmsxdWKoOsV0PftcQvBCCYuhKbZV9s5hjt9qn8CE86A5g5KqDf83Fxqm/ vXKgHNFHE5zgXGZnrmaf6resQzbvJHO0Fb0CcIohzrpPaL3YepcLDoCCgElGMGQjdCcSQ+Ci FCRl0Bvyj1YZUql+ZkptgGjikQARAQABwsFfBBgBAgAJBQJUY85qAhsMAAoJEGg1lTBwyZKw l4IQAIKHs/9po4spZDFyfDjunimEhVHqlUt7ggR1Hsl/tkvTSze8pI1P6dGp2XW6AnH1iayn yRcoyT0ZJ+Zmm4xAH1zqKjWplzqdb/dO28qk0bPso8+1oPO8oDhLm1+tY+cOvufXkBTm+whm +AyNTjaCRt6aSMnA/QHVGSJ8grrTJCoACVNhnXg/R0g90g8iV8Q+IBZyDkG0tBThaDdw1B2l asInUTeb9EiVfL/Zjdg5VWiF9LL7iS+9hTeVdR09vThQ/DhVbCNxVk+DtyBHsjOKifrVsYep WpRGBIAu3bK8eXtyvrw1igWTNs2wazJ71+0z2jMzbclKAyRHKU9JdN6Hkkgr2nPb561yjcB8 sIq1pFXKyO+nKy6SZYxOvHxCcjk2fkw6UmPU6/j/nQlj2lfOAgNVKuDLothIxzi8pndB8Jju KktE5HJqUUMXePkAYIxEQ0mMc8Po7tuXdejgPMwgP7x65xtfEqI0RuzbUioFltsp1jUaRwQZ MTsCeQDdjpgHsj+P2ZDeEKCbma4m6Ez/YWs4+zDm1X8uZDkZcfQlD9NldbKDJEXLIjYWo1PH hYepSffIWPyvBMBTW2W5FRjJ4vLRrJSUoEfJuPQ3vW9Y73foyo/qFoURHO48AinGPZ7PC7TF vUaNOTjKedrqHkaOcqB185ahG2had0xnFsDPlx5y In-Reply-To: <20260902-dummy_ptxp3-v3-15-5d8f5b17c25c@arm.com> This is a multi-part message in MIME format. --------------4S7eK5PTldGor8W3n9zFHezW Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 9/2/26 04:56, Yeoreum Yun wrote: > The behaviour of pXd_page() will change with generic compile-time folded > page tables by disallowing its use and triggering a compile-time error > when it's used improperly, ensuring that the actual pXd_page() is used > instead. > > To prepare fot that, skip collapse_pud_page() when > CONFIG_X86_DIRECT_GBPAGES is disabled. Nit: this doesn't explain how the change actually fixes anything or what the specific problem being solved is. I think you want to say something along the lines of: collapse_pud_page() uses pud_page() in a way which will soon trigger a compile-time error on configs that have a folded pud. The code which will generate that error is actually unreachable on those configs because 'direct_gbpages' is always 0 there. However, the compiler does not know that because 'direct_gbpages' is a normal integer from a separate compilation unit. Make the compiler aware when most of collapse_pud_page() is unreachable by adding a Kconfig check. This ensures it will not trip the errors when they are introduced. It probably also trims the kernel image down a wee bit too as a side benefit. Maybe I should just merge something like the attached patch. I think it would solve your problem and make things generally cleaner too. --------------4S7eK5PTldGor8W3n9zFHezW Content-Type: text/x-patch; charset=UTF-8; name="direct_gbpages-compiletime.patch" Content-Disposition: attachment; filename="direct_gbpages-compiletime.patch" Content-Transfer-Encoding: base64 ClRoZXJlIGlzIGFuIGV4aXN0aW5nIHZhcmlhYmxlIChkaXJlY3RfZ2JwYWdlcykgdGhhdCBz YXlzIHdoZXRoZXIgdGhlCmtlcm5lbCBjYW4gYW5kIHNob3VsZCB1c2UgMUcgcGFnZXMgaW4g dGhlIGRpcmVjdCBtYXAuIEl0IGlzIGRyaXZlbgpieSBhIGJ1bmNoIG9mIG90aGVyIG1hY2hp bmVyeS4gQXQgbGVhc3Q6CgogMS4gSGFyZHdhcmUgc3VwcG9ydCBmb3IgMUcgcGFnZXMKIDIu IEtjb25maWcgc3VwcG9ydCBmb3IgMUcgZGlyZWN0IG1hcHBpbmdzCiAzLiBLZXJuZWwgY29t bWFuZCBsaW5lIG92ZXJyaWRlcwoKTW9zdCBjb2RlIGp1c3QgY2hlY2tzIHRoZSAnZGlyZWN0 X2dicGFnZXMnIHZhcmlhYmxlIGl0c2VsZi4gQnV0IHRoaXMKcHJldmVudHMgY29tcGlsZXIg b3B0aW1pemF0aW9uIGluIGNhc2VzIHdoZXJlIDFHIG1hcHBpbmdzIGFyZQpjb21waWxlLXRp bWUgZGlzYWJsZWQgKHZpYSBYODZfRElSRUNUX0dCUEFHRVMpLgoKQWRkIGEgaGVscGVyIHRv 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