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Fri, 6 Nov 2026 14:45:57 -0600 Received: from [172.19.68.247] (10.180.168.240) by satlexmb08.amd.com (10.181.42.217) with Microsoft SMTP Server id 15.2.2562.53 via Frontend Transport; Fri, 6 Nov 2026 14:45:56 -0600 Message-ID: Date: Fri, 6 Nov 2026 12:45:56 -0800 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH V1] accel/amdxdna: Use vma->vm_mm consistently in amdxdna_hmm_register() To: Lizhi Hou , , , , , CC: , References: <20261106203516.2734090-1-lizhi.hou@amd.com> Content-Language: en-US From: Max Zhen In-Reply-To: <20261106203516.2734090-1-lizhi.hou@amd.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ5PEPF000001D6:EE_|BL3PR12MB6571:EE_ X-MS-Office365-Filtering-Correlation-Id: 04a125d5-04ce-4912-773d-08df3c46f5fd X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|36860700016|376014|1800799024|82310400026|261026140227099003|261026121527099003|11063799006|56012099006|261009223027099003|261021123027099003|261021121427099003|261022105027099003|261102123227099003|261028144727099003|18002099003|22082099003|10067099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: q73IykKYqW/6MRebArb0W0tb5GSl6s6vzCdj31dCZjRQ9RyJv0S4zJOCBEWqYtjH7tIGz5HzjsCcXg5UF5uVv+1e/FmHYnXP/Lw8IOB5EJM9D7gnLs7JmB/iGViBIqdO5lXHkuKrl2I4tzj3/IpdJrafGp+fsSfFK9KUa6MD2bFDcnPaZmbnS+oTykcnGAV0nU7MGgGIR8bbaLUeHAv+YtmF+NtI9BRA3NFrQj+VyuYHql/W+1yhSV6CbfOYCp1CNJZ9JZ3N5+7M3l5iXS4zoO94qrbqO3hgc8nvAQeubKvLkbzZqPwi7WkHq+by/wvw3xnPzFTL5suWFU3u3tft+MYODykdA+zSxn1AtrcwvWGHE3aP+DTCpdHiW5w6rvtlcmJRmeAeYKh4qqf1J8IaFQy6zBHiJZF3Jd+9IU5KM2bo+EpZuabooedWidHduOWM X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Nov 2026 20:45:58.1631 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 04a125d5-04ce-4912-773d-08df3c46f5fd X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[satlexmb08.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SJ5PEPF000001D6.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL3PR12MB6571 On 11/6/2026 Fri 12:35, Lizhi Hou wrote: > amdxdna_hmm_register() keys the umap list lookup and the interval > notifier insertion on current->mm, while amdxdna_hmm_unregister() and > amdxdna_mark_mapp_invalid() match the same list entries against > vma->vm_mm. The two are identical for the ->mmap() callback, so this is > not a functional change, but the inconsistency makes the code harder to > follow. > > Use vma->vm_mm in both places. It is the mm whose mmap_lock is held > across ->mmap(), which is what mmu_interval_notifier_insert_locked() > asserts on, and it is the mm the teardown paths look the mapping up by. > > Assisted-by: LLM > Signed-off-by: Lizhi Hou Reviewed-by: Max Zhen > --- > drivers/accel/amdxdna/amdxdna_gem.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/accel/amdxdna/amdxdna_gem.c b/drivers/accel/amdxdna/amdxdna_gem.c > index 09e48c794e1b..92125bc753c7 100644 > --- a/drivers/accel/amdxdna/amdxdna_gem.c > +++ b/drivers/accel/amdxdna/amdxdna_gem.c > @@ -443,7 +443,7 @@ static int amdxdna_hmm_register(struct amdxdna_gem_obj *abo, > > down_read(&xdna->notifier_lock); > list_for_each_entry(mapp, &abo->mem.umap_list, node) { > - if (compare_range(mapp, current->mm, addr, addr + len)) { > + if (compare_range(mapp, vma->vm_mm, addr, addr + len)) { > up_read(&xdna->notifier_lock); > return 0; > } > @@ -477,7 +477,7 @@ static int amdxdna_hmm_register(struct amdxdna_gem_obj *abo, > kref_init(&mapp->refcnt); > > ret = mmu_interval_notifier_insert_locked(&mapp->notifier, > - current->mm, > + vma->vm_mm, > addr, > len, > &amdxdna_hmm_ops); > > base-commit: d2a8cee91bfa8616f713c7c8f539a81e8e3554ea