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[PATCH] mm/memory-tier: Fix abstract distance calculation overflow To: Li Zhijian , linux-mm@kvack.org Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org, Ying Huang References: <20250610062751.2365436-1-lizhijian@fujitsu.com> Content-Language: en-US From: Balbir Singh In-Reply-To: <20250610062751.2365436-1-lizhijian@fujitsu.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-ClientProxiedBy: BY5PR03CA0022.namprd03.prod.outlook.com (2603:10b6:a03:1e0::32) To PH8PR12MB7277.namprd12.prod.outlook.com (2603:10b6:510:223::13) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PH8PR12MB7277:EE_|PH7PR12MB5829:EE_ X-MS-Office365-Filtering-Correlation-Id: 42384e2b-9789-4dfe-6f6c-08dda7e9ae63 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|376014|1800799024|7053199007; X-Microsoft-Antispam-Message-Info: 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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 6/10/25 16:27, Li Zhijian wrote: > In mt_perf_to_adistance(), the calculation of abstract distance (adist) > involves multiplying several int values including MEMTIER_ADISTANCE_DRAM. > ``` > *adist = MEMTIER_ADISTANCE_DRAM * > (perf->read_latency + perf->write_latency) / > (default_dram_perf.read_latency + default_dram_perf.write_latency) * > (default_dram_perf.read_bandwidth + default_dram_perf.write_bandwidth) / > (perf->read_bandwidth + perf->write_bandwidth); > ``` > Since these values can be large, the multiplication may exceed the maximum > value of an int (INT_MAX) and overflow (Our platform did), leading to an > incorrect adist. > > Change MEMTIER_ADISTANCE_DRAM to be a long constant by writing it with the > 'L' suffix. This prevents the overflow because the multiplication will then > be done in the long type which has a larger range. > > Fixes: 3718c02dbd4c ("acpi, hmat: calculate abstract distance with HMAT") > Cc: Ying Huang > Signed-off-by: Li Zhijian > --- > include/linux/memory-tiers.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/include/linux/memory-tiers.h b/include/linux/memory-tiers.h > index 0dc0cf2863e2..7a805796fcfd 100644 > --- a/include/linux/memory-tiers.h > +++ b/include/linux/memory-tiers.h > @@ -18,7 +18,7 @@ > * adistance value (slightly faster) than default DRAM adistance to be part of > * the same memory tier. > */ > -#define MEMTIER_ADISTANCE_DRAM ((4 * MEMTIER_CHUNK_SIZE) + (MEMTIER_CHUNK_SIZE >> 1)) > +#define MEMTIER_ADISTANCE_DRAM ((4L * MEMTIER_CHUNK_SIZE) + (MEMTIER_CHUNK_SIZE >> 1)) > > struct memory_tier; > struct memory_dev_type { Acked-by: Balbir Singh Balbir