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X-CSE-ConnectionGUID: gERcdnJYQpGXvCqrFDPEeQ== X-CSE-MsgGUID: fTTVlMWbSpa9c87mPHErMw== X-IronPort-AV: E=McAfee;i="6800,10657,11738"; a="75060882" X-IronPort-AV: E=Sophos;i="6.23,138,1770624000"; d="scan'208";a="75060882" Received: from orviesa001.jf.intel.com ([10.64.159.141]) by orvoesa112.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Mar 2026 01:00:42 -0700 X-CSE-ConnectionGUID: fFzXhO+xS3SDWPlVar7ADQ== X-CSE-MsgGUID: Udc32wB4RE6CAt6sSsNiWw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.23,138,1770624000"; d="scan'208";a="262202678" Received: from lkp-server01.sh.intel.com (HELO 3905d212be1b) ([10.239.97.150]) by orviesa001.jf.intel.com with ESMTP; 24 Mar 2026 01:00:35 -0700 Received: from kbuild by 3905d212be1b with local (Exim 4.98.2) (envelope-from ) id 1w4wgh-000000004CD-2iTp; Tue, 24 Mar 2026 08:00:31 +0000 Date: Tue, 24 Mar 2026 16:00:13 +0800 From: kernel test robot To: Brendan Jackman , Borislav Petkov , Dave Hansen , Peter Zijlstra , Andrew Morton , David Hildenbrand , Vlastimil Babka , Wei Xu , Johannes Weiner , Zi Yan , Lorenzo Stoakes Cc: oe-kbuild-all@lists.linux.dev, Linux Memory Management List , linux-kernel@vger.kernel.org, x86@kernel.org, rppt@kernel.org, Sumit Garg , derkling@google.com, reijiw@google.com, Will Deacon , rientjes@google.com, "Kalyazin, Nikita" , patrick.roy@linux.dev, "Itazuri, Takahiro" , Andy Lutomirski , David Kaplan , Thomas Gleixner , Brendan Jackman , Yosry Ahmed Subject: Re: [PATCH v2 07/22] mm: KUnit tests for the mermap Message-ID: <202603241512.3kG43FzT-lkp@intel.com> References: <20260320-page_alloc-unmapped-v2-7-28bf1bd54f41@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260320-page_alloc-unmapped-v2-7-28bf1bd54f41@google.com> Hi Brendan, kernel test robot noticed the following build warnings: [auto build test WARNING on b5d083a3ed1e2798396d5e491432e887da8d4a06] url: https://github.com/intel-lab-lkp/linux/commits/Brendan-Jackman/x86-mm-split-out-preallocate_sub_pgd/20260321-042521 base: b5d083a3ed1e2798396d5e491432e887da8d4a06 patch link: https://lore.kernel.org/r/20260320-page_alloc-unmapped-v2-7-28bf1bd54f41%40google.com patch subject: [PATCH v2 07/22] mm: KUnit tests for the mermap config: x86_64-randconfig-101-20260324 (https://download.01.org/0day-ci/archive/20260324/202603241512.3kG43FzT-lkp@intel.com/config) compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-kbuild-all/202603241512.3kG43FzT-lkp@intel.com/ cocci warnings: (new ones prefixed by >>) >> mm/tests/mermap_kunit.c:156:2-3: Unneeded semicolon vim +156 mm/tests/mermap_kunit.c 131 132 static void test_multiple_allocs(struct kunit *test) 133 { 134 struct __mermap_put_args *argss[NR_NORMAL_ALLOCS] = { }; 135 struct page *pages[NR_NORMAL_ALLOCS + 1]; 136 struct mermap_alloc *reserved_alloc; 137 struct mm_struct *mm = get_mm(test); 138 int magic = 0xE4A4; 139 140 for (int i = 0; i < ARRAY_SIZE(pages); i++) { 141 pages[i] = alloc_page_wrapper(test, GFP_KERNEL); 142 WRITE_ONCE(*(int *)page_to_virt(pages[i]), magic + i); 143 } 144 145 for (int i = 0; i < ARRAY_SIZE(argss); i++) { 146 unsigned long base = mermap_cpu_base(raw_smp_processor_id()); 147 unsigned long end = mermap_cpu_end(raw_smp_processor_id()); 148 unsigned long addr; 149 150 argss[i] = __mermap_get_wrapper(test, mm, pages[i], PAGE_SIZE, PAGE_KERNEL); 151 KUNIT_ASSERT_NOT_NULL_MSG(test, argss[i], "alloc %d failed", i); 152 153 addr = (unsigned long) mermap_addr(argss[i]->alloc); 154 KUNIT_EXPECT_GE_MSG(test, addr, base, "alloc %d out of range", i); 155 KUNIT_EXPECT_LT_MSG(test, addr, end, "alloc %d out of range", i); > 156 }; 157 158 /* 159 * Read through the mappings to try and detect if they point to the 160 * pages we wrote earlier. 161 */ 162 kthread_use_mm(mm); 163 for (int i = 0; i < ARRAY_SIZE(pages) - 1; i++) { 164 int *ptr = (int *)mermap_addr(argss[i]->alloc); 165 166 KUNIT_EXPECT_EQ(test, *ptr, magic + i); 167 } 168 169 /* Run out of alloc structures, only reserved allocs should succeed now. */ 170 KUNIT_ASSERT_NULL(test, __mermap_get(mm, pages[NR_NORMAL_ALLOCS], 171 PAGE_SIZE, PAGE_KERNEL, false)); 172 preempt_disable(); 173 reserved_alloc = __mermap_get(mm, pages[NR_NORMAL_ALLOCS], 174 PAGE_SIZE, PAGE_KERNEL, true); 175 KUNIT_EXPECT_NOT_NULL(test, reserved_alloc); 176 /* Also check if this mapping seems correct*/ 177 if (reserved_alloc) { 178 int *ptr = (int *)mermap_addr(reserved_alloc); 179 180 KUNIT_EXPECT_EQ(test, *ptr, magic + NR_NORMAL_ALLOCS); 181 182 mermap_put(reserved_alloc); 183 } 184 preempt_enable(); 185 186 kthread_unuse_mm(mm); 187 } 188 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki