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a=ed25519-sha256; t=1775063806; l=2905; i=shivamkalra98@zohomail.in; s=20260212; h=from:subject:message-id; bh=yP1QXayDidKnNU2S8I7BqJprRzQI2mQyl0fytHsaqPM=; b=K+rvqijkH6LgioddShavqfdDzGqGhFPpOudpCsY2f5P28WR6Xscdt+/cPBZMV4+aWr6Zijp2d Y3sYegmUeZYBuDOhdMAZGuZmXpwWjr78v8g053MOKdoIlCWSUOYYW2B 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-Stat-Signature: iyjoikezexnmabyqy7cgfwnqsimn11n1 X-Rspamd-Queue-Id: 21FFE120008 X-Rspam-User: X-Rspamd-Server: rspam03 X-HE-Tag: 1775063810-654502 X-HE-Meta: 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 txtYTjZX 1D0PvTfuy+z/hDKF/7NPWxNBgDoFWkjwRVYyVrpe9FyjrGHFADSKIFcRXBWsUqwuDTEqavz6BXUaETq8qReO/Fcp7lu4Atc9aT2XWEPSZMGfT8BC5Dbqd69UAfIs8ZPXeZHm6qRpXnjBEz2U1KxW+RXMXbXfGFpV8WKrymR/CYOtMDFYo3ac1Ovzj3fU8wHUjF/WnnyPC4TGtQlvvaqzd0yEQMzYoEdaauRBVoETSy8iePnGc0qh+RIs7RlnOAd1i0a4K1gwPPYa8O7jm1VY4ciWlIC54OQRioAzD7GTdMDKFPsb9fDcMNCFqAs/k1f1Pu5KOoMIa0NO9J6oK02oYkRz1sV3NajxRoN4pwFKDCts6WLlnvS1iNQ2+ek9yKaqAPM83tWJdRFZhSaixQ6DrTeV87N+3G2KiCKVdjcRcQEAaq6V8R23o6Fxing== 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). Reviewed-by: Uladzislau Rezki (Sony) Signed-off-by: Shivam Kalra --- lib/test_vmalloc.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) diff --git a/lib/test_vmalloc.c b/lib/test_vmalloc.c index 876c72c18a0c..b23f85e8f8ca 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 +422,66 @@ vm_map_ram_test(void) return nr_allocated != map_nr_pages; } +static int vrealloc_test(void) +{ + void *ptr, *tmp; + int i; + + for (i = 0; i < test_loop_count; i++) { + int err = -1; + + ptr = vrealloc(NULL, PAGE_SIZE, GFP_KERNEL); + if (!ptr) + return -1; + + *((__u8 *)ptr) = 'a'; + + /* Grow: beyond allocated pages, triggers full realloc. */ + tmp = vrealloc(ptr, 4 * PAGE_SIZE, GFP_KERNEL); + if (!tmp) + goto error; + ptr = tmp; + + if (*((__u8 *)ptr) != 'a') + goto error; + + /* Shrink: crosses page boundary, frees tail pages. */ + tmp = vrealloc(ptr, PAGE_SIZE, GFP_KERNEL); + if (!tmp) + goto error; + ptr = tmp; + + if (*((__u8 *)ptr) != 'a') + goto error; + + /* Shrink: within same page, no page freeing. */ + tmp = vrealloc(ptr, PAGE_SIZE / 2, GFP_KERNEL); + if (!tmp) + goto error; + ptr = tmp; + + if (*((__u8 *)ptr) != 'a') + goto error; + + /* Grow: within allocated page, in-place, no realloc. */ + tmp = vrealloc(ptr, PAGE_SIZE, GFP_KERNEL); + if (!tmp) + goto error; + ptr = tmp; + + if (*((__u8 *)ptr) != 'a') + goto error; + + err = 0; +error: + vfree(ptr); + if (err) + return err; + } + + return 0; +} + struct test_case_desc { const char *test_name; int (*test_func)(void); @@ -440,6 +501,7 @@ 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