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Mon, 15 Sep 2025 06:40:44 -0700 (PDT) Received: from localhost.localdomain ([2001:9b1:d5a0:a500::24b]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-573c8330e54sm1150719e87.63.2025.09.15.06.40.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 15 Sep 2025 06:40:43 -0700 (PDT) From: "Uladzislau Rezki (Sony)" To: linux-mm@kvack.org, Andrew Morton Cc: Michal Hocko , Baoquan He , LKML , Uladzislau Rezki Subject: [PATCH v2 01/10] lib/test_vmalloc: add no_block_alloc_test case Date: Mon, 15 Sep 2025 15:40:31 +0200 Message-ID: <20250915134041.151462-2-urezki@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20250915134041.151462-1-urezki@gmail.com> References: <20250915134041.151462-1-urezki@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 060341C0006 X-Stat-Signature: u6xxco38sdrfj4n6y6oxjk1izy6oh7z5 X-HE-Tag: 1757943645-768215 X-HE-Meta: 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 y/1TcDe7 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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: Introduce a new test case "no_block_alloc_test" that verifies non-blocking allocations using __vmalloc() with GFP_ATOMIC and GFP_NOWAIT flags. It is recommended to build kernel with CONFIG_DEBUG_ATOMIC_SLEEP enabled to help catch "sleeping while atomic" issues. This test ensures that memory allocation logic under atomic constraints does not inadvertently sleep. Signed-off-by: Uladzislau Rezki (Sony) --- lib/test_vmalloc.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/lib/test_vmalloc.c b/lib/test_vmalloc.c index 2815658ccc37..aae5f4910aff 100644 --- a/lib/test_vmalloc.c +++ b/lib/test_vmalloc.c @@ -54,6 +54,7 @@ __param(int, run_test_mask, 7, "\t\tid: 256, name: kvfree_rcu_1_arg_vmalloc_test\n" "\t\tid: 512, name: kvfree_rcu_2_arg_vmalloc_test\n" "\t\tid: 1024, name: vm_map_ram_test\n" + "\t\tid: 2048, name: no_block_alloc_test\n" /* Add a new test case description here. */ ); @@ -283,6 +284,30 @@ static int fix_size_alloc_test(void) return 0; } +static int no_block_alloc_test(void) +{ + void *ptr; + int i; + + for (i = 0; i < test_loop_count; i++) { + bool use_atomic = !!(get_random_u8() % 2); + gfp_t gfp = use_atomic ? GFP_ATOMIC : GFP_NOWAIT; + unsigned long size = (nr_pages > 0 ? nr_pages : 1) * PAGE_SIZE; + + preempt_disable(); + ptr = __vmalloc(size, gfp); + preempt_enable(); + + if (!ptr) + return -1; + + *((__u8 *)ptr) = 0; + vfree(ptr); + } + + return 0; +} + static int pcpu_alloc_test(void) { @@ -411,6 +436,7 @@ static struct test_case_desc test_case_array[] = { { "kvfree_rcu_1_arg_vmalloc_test", kvfree_rcu_1_arg_vmalloc_test, }, { "kvfree_rcu_2_arg_vmalloc_test", kvfree_rcu_2_arg_vmalloc_test, }, { "vm_map_ram_test", vm_map_ram_test, }, + { "no_block_alloc_test", no_block_alloc_test, true }, /* Add a new test case here. */ }; -- 2.47.3