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Thu, 07 Aug 2025 00:58:13 -0700 (PDT) Received: from pc638.lan ([2001:9b1:d5a0:a500:2d8:61ff:fec9:d743]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-55b88c9b1fesm2501995e87.96.2025.08.07.00.58.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 07 Aug 2025 00:58:13 -0700 (PDT) From: "Uladzislau Rezki (Sony)" To: linux-mm@kvack.org, Andrew Morton Cc: Vlastimil Babka , Michal Hocko , Baoquan He , LKML , Uladzislau Rezki Subject: [PATCH 1/8] lib/test_vmalloc: add no_block_alloc_test case Date: Thu, 7 Aug 2025 09:58:03 +0200 Message-Id: <20250807075810.358714-2-urezki@gmail.com> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250807075810.358714-1-urezki@gmail.com> References: <20250807075810.358714-1-urezki@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: 3c1mhhqs8zgoox9u9tiotsjb5dygjmad X-Rspam-User: X-Rspamd-Queue-Id: 217C2140006 X-Rspamd-Server: rspam02 X-HE-Tag: 1754553495-51946 X-HE-Meta: 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 Edk0AvlV 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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. */ }; -- 2.39.5