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Tue, 07 Oct 2025 05:20:40 -0700 (PDT) Received: from localhost.localdomain ([2001:9b1:d5a0:a500::24b]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-58b01141151sm6061947e87.59.2025.10.07.05.20.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 07 Oct 2025 05:20:39 -0700 (PDT) From: "Uladzislau Rezki (Sony)" To: linux-mm@kvack.org, Andrew Morton Cc: Michal Hocko , Baoquan He , LKML , Uladzislau Rezki Subject: [PATCH v4 01/10] lib/test_vmalloc: add no_block_alloc_test case Date: Tue, 7 Oct 2025 14:20:26 +0200 Message-ID: <20251007122035.56347-2-urezki@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20251007122035.56347-1-urezki@gmail.com> References: <20251007122035.56347-1-urezki@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: D9827180005 X-Rspamd-Server: rspam11 X-Rspam-User: X-Stat-Signature: iosk596sycpqdfimsu6xj3ebosmiyxod X-HE-Tag: 1759839641-860104 X-HE-Meta: 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 kex6TlM0 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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