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a=ed25519-sha256; t=1773479164; l=2680; i=shivamkalra98@zohomail.in; s=20260212; h=from:subject:message-id; bh=vGtWOd+QVlnd5fUIfOUP0oSJ0Gu3V+AGGjAsUp+yrM4=; b=ZlC06BPiN19E6EC05bRswEeu5zLVKJ2Ai6lAnm/0OA9b5z49oH4h0mOBUldtoDwZpqrM+2dVD wIb8zLxhCqvALIzYJirqqA4dSyII/Gw2jQfRf+pohOSMKj2/dKPaw0I X-Developer-Key: i=shivamkalra98@zohomail.in; a=ed25519; pk=9Q+S1LD/xjbjL7bEaLIlwRADBwU/6LJq7lYm8LFrkQE= X-Endpoint-Received: by B4 Relay for shivamkalra98@zohomail.in/20260212 with auth_id=633 X-Original-From: Shivam Kalra Reply-To: shivamkalra98@zohomail.in X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 07BFC4000B X-Stat-Signature: tsoisj5ekwqjuufm84hkg5zwqqxj8b5p X-HE-Tag: 1773479167-777486 X-HE-Meta: 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 7gGGtB+u +05DR8jb5Ev/AmXRxuWgxtk5ne+IxM7C4jfT7yntqaJMwALHUNvYsKtt+VLmVl8wszAQSb7smY1B/qpf4eC67PPbUL0qVggSeOkNEOJE/kFO7W2jbubbUetWmXKUHOyq52ajzHf/FJhUTzoyEqd9ttJx0AJA7C8LR+vnovY2GfQa3hFfBWPNDjGIEmyiUy6Q4HhIYvnJjq6SERuAByfzBQghLQS6UOQaw5tNF6XNWV/6U/lo23mejRntq9fN0yxA/tlsx2ux2H1Yi54kx/bz4gESPBT+20lWtd64Gu4msfBaeqdFm8CtCybn8l79A/9fkN5w50Ki1kFDnBwxrHjYHIBCIn0iXhEsDYOhfMA2nCsYa3iEea0fAzk/k1w== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Shivam Kalra Introduce a new test case "vrealloc_test" that exercises the vrealloc() shrink and in-place grow paths: - Grow beyond allocated pages (triggers full reallocation). - Shrink crossing a page boundary (frees tail pages). - Shrink within the same page (no page freeing). - Grow within the already allocated page count (in-place). Data integrity is validated after each realloc step by checking that the first byte of the original allocation is preserved. The test is gated behind run_test_mask bit 12 (id 4096). Signed-off-by: Shivam Kalra --- lib/test_vmalloc.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) diff --git a/lib/test_vmalloc.c b/lib/test_vmalloc.c index 876c72c18a0c..ce2b2777a785 100644 --- a/lib/test_vmalloc.c +++ b/lib/test_vmalloc.c @@ -55,6 +55,7 @@ __param(int, run_test_mask, 7, "\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" + "\t\tid: 4096, name: vrealloc_test\n" /* Add a new test case description here. */ ); @@ -421,6 +422,56 @@ vm_map_ram_test(void) return nr_allocated != map_nr_pages; } +static int vrealloc_test(void) +{ + void *ptr; + int i; + + for (i = 0; i < test_loop_count; i++) { + ptr = vmalloc(PAGE_SIZE); + if (!ptr) + return -1; + + *((__u8 *)ptr) = 'a'; + + /* Grow: beyond allocated pages, triggers full realloc. */ + ptr = vrealloc(ptr, 4 * PAGE_SIZE, GFP_KERNEL); + if (!ptr) + return -1; + + if (*((__u8 *)ptr) != 'a') + return -1; + + /* Shrink: crosses page boundary, frees tail pages. */ + ptr = vrealloc(ptr, PAGE_SIZE, GFP_KERNEL); + if (!ptr) + return -1; + + if (*((__u8 *)ptr) != 'a') + return -1; + + /* Shrink: within same page, no page freeing. */ + ptr = vrealloc(ptr, PAGE_SIZE / 2, GFP_KERNEL); + if (!ptr) + return -1; + + if (*((__u8 *)ptr) != 'a') + return -1; + + /* Grow: within allocated page, in-place, no realloc. */ + ptr = vrealloc(ptr, PAGE_SIZE, GFP_KERNEL); + if (!ptr) + return -1; + + if (*((__u8 *)ptr) != 'a') + return -1; + + vfree(ptr); + } + + return 0; +} + struct test_case_desc { const char *test_name; int (*test_func)(void); @@ -440,6 +491,7 @@ static struct test_case_desc test_case_array[] = { { "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 }, + { "vrealloc_test", vrealloc_test, }, /* Add a new test case here. */ }; -- 2.43.0