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X-CSE-ConnectionGUID: wWpl0FazT2irw+jJCDTMUg== X-CSE-MsgGUID: 6CiTkSRaTH+jKB2LpEetNQ== X-IronPort-AV: E=McAfee;i="6700,10204,11342"; a="42786419" X-IronPort-AV: E=Sophos;i="6.13,278,1732608000"; d="scan'208";a="42786419" Received: from fmviesa008.fm.intel.com ([10.60.135.148]) by fmvoesa107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Feb 2025 11:59:20 -0800 X-CSE-ConnectionGUID: O9AWFUy3RJO+9tb/yFTjLQ== X-CSE-MsgGUID: wP1KLtz+QiSuzJuh+2GpBA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.13,278,1732608000"; d="scan'208";a="112826024" Received: from msatwood-mobl.amr.corp.intel.com (HELO [10.125.108.48]) ([10.125.108.48]) by fmviesa008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Feb 2025 11:59:16 -0800 Message-ID: <3d750b58-d911-4f24-93e4-b84213849071@intel.com> Date: Tue, 11 Feb 2025 11:59:15 -0800 Precedence: bulk X-Mailing-List: llvm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 08/15] x86: Physical address comparisons in fill_p*d/pte To: Maciej Wieczor-Retman Cc: luto@kernel.org, xin@zytor.com, kirill.shutemov@linux.intel.com, palmer@dabbelt.com, tj@kernel.org, andreyknvl@gmail.com, brgerst@gmail.com, ardb@kernel.org, dave.hansen@linux.intel.com, jgross@suse.com, will@kernel.org, akpm@linux-foundation.org, arnd@arndb.de, corbet@lwn.net, dvyukov@google.com, richard.weiyang@gmail.com, ytcoode@gmail.com, tglx@linutronix.de, hpa@zytor.com, seanjc@google.com, paul.walmsley@sifive.com, aou@eecs.berkeley.edu, justinstitt@google.com, jason.andryuk@amd.com, glider@google.com, ubizjak@gmail.com, jannh@google.com, bhe@redhat.com, vincenzo.frascino@arm.com, rafael.j.wysocki@intel.com, ndesaulniers@google.com, mingo@redhat.com, catalin.marinas@arm.com, junichi.nomura@nec.com, nathan@kernel.org, ryabinin.a.a@gmail.com, dennis@kernel.org, bp@alien8.de, kevinloughlin@google.com, morbo@google.com, dan.j.williams@intel.com, julian.stecklina@cyberus-technology.de, peterz@infradead.org, cl@linux.com, kees@kernel.org, kasan-dev@googlegroups.com, x86@kernel.org, linux-arm-kernel@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, llvm@lists.linux.dev, linux-doc@vger.kernel.org References: <2c2a71ec844db597f30754dd79faf87c9de0b21f.1738686764.git.maciej.wieczor-retman@intel.com> From: Dave Hansen Content-Language: en-US Autocrypt: addr=dave.hansen@intel.com; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 2/7/25 08:37, Maciej Wieczor-Retman wrote: > @@ -287,7 +290,7 @@ static pte_t *fill_pte(pmd_t *pmd, unsigned long vaddr) > if (pmd_none(*pmd)) { > pte_t *pte = (pte_t *) spp_getpage(); > pmd_populate_kernel(&init_mm, pmd, pte); > - if (pte != pte_offset_kernel(pmd, 0)) > + if (__pa(pte) != (pmd_val(*pmd) & pmd_pfn_mask(*pmd))) > printk(KERN_ERR "PAGETABLE BUG #03!\n"); > } > return pte_offset_kernel(pmd, vaddr); Open coding it like this is fine with me. The p*_offset_kernel(p*,0) thing is arguably even harder to parse.