From nobody Tue Apr 7 02:34:27 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EA4283128C6 for ; Tue, 17 Mar 2026 08:17:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773735459; cv=none; b=s+Y7bLfLX1wSQJpzV+BAq7ktGPOGQZ94bioeOYiajrbCQb/OiACD7tQCcwbxDL0kkdpG2szzw+nVkBNhj2VIl2tbdUA7oANiwkrPhgOgAQbZDwleKvFLeOxM4EWCCGTpxhDLmf5Bt2iAFFLBwsCiU37EcgE7AxJHzVTSjTgXFlM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773735459; c=relaxed/simple; bh=CVIAq93ZteUDhJ/xiIE3C2yFgjiz/OpnbCzoIeyuy5w=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=C6zdgVfBQ5sDJwXsNfovJq73N3lQEYlP/KYE/lAzZTqif/uZh+q++sFl7pXgQrhVfzjvSQP8aFHcPGousm7jWtefFveNKUl8UlcAxz/Fc4NnXsY5mFW4AWOOhVsOOxhVF8XlFjVzc8lS1/9ZeJ6X/M3KR7IN40vrQ1nYuGF1JWA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=FKXIp1EP; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="FKXIp1EP" Received: by smtp.kernel.org (Postfix) with ESMTPS id BF9BFC2BCAF; Tue, 17 Mar 2026 08:17:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773735458; bh=CVIAq93ZteUDhJ/xiIE3C2yFgjiz/OpnbCzoIeyuy5w=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=FKXIp1EP04imyX93u+OOXcxXjE6xPXiWX1QYn0voWosmL3WArVdn1excQ8D3DUJ57 82jEAvZ6CvisacjktBrrxX/0U+04oMtTICfofawSQYhQFS0KOgc4degcxR68pVgHfU Ypk3gL2MwILHF4ZofHJvJZv1aYQ4LhY8nzisfFTXkkmoELuVLq0lqkDlHIr6kFEZWT Yr1E8GwyKQhIWpK+VL/lW7rKmkl5igoUtVFjfr5TmA5cEsQZzksx2jEDHZALBN5yj5 Sx6Q7REoFKzIzO7RrVHAN/S4ArSqnOOzHtZte95CNh48IYKqgPieQhkq1ZbfsQm1wK ReV7A+sDJNg9w== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id B5DE9F33812; Tue, 17 Mar 2026 08:17:38 +0000 (UTC) From: Shivam Kalra via B4 Relay Date: Tue, 17 Mar 2026 13:47:35 +0530 Subject: [PATCH v5 3/3] lib/test_vmalloc: add vrealloc test case Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260317-vmalloc-shrink-v5-3-bbfbf54c5265@zohomail.in> References: <20260317-vmalloc-shrink-v5-0-bbfbf54c5265@zohomail.in> In-Reply-To: <20260317-vmalloc-shrink-v5-0-bbfbf54c5265@zohomail.in> To: Andrew Morton , Uladzislau Rezki Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Alice Ryhl , Danilo Krummrich , Shivam Kalra X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1773735454; l=2680; i=shivamkalra98@zohomail.in; s=20260212; h=from:subject:message-id; bh=vGtWOd+QVlnd5fUIfOUP0oSJ0Gu3V+AGGjAsUp+yrM4=; b=nsPZ51c4i4HerfAVKo7lTeH6+ar+WYWuYCzdnfI6srbeugwWqkl6+ZP2g2l7BDC6P9fFKz3KX au3qF0XEVYoC7CoeIy0tRugMUONIC3ShIm4y9bLNLqcpkpKmSyb1UfU 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 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. */ ); =20 @@ -421,6 +422,56 @@ vm_map_ram_test(void) return nr_allocated !=3D map_nr_pages; } =20 +static int vrealloc_test(void) +{ + void *ptr; + int i; + + for (i =3D 0; i < test_loop_count; i++) { + ptr =3D vmalloc(PAGE_SIZE); + if (!ptr) + return -1; + + *((__u8 *)ptr) =3D 'a'; + + /* Grow: beyond allocated pages, triggers full realloc. */ + ptr =3D vrealloc(ptr, 4 * PAGE_SIZE, GFP_KERNEL); + if (!ptr) + return -1; + + if (*((__u8 *)ptr) !=3D 'a') + return -1; + + /* Shrink: crosses page boundary, frees tail pages. */ + ptr =3D vrealloc(ptr, PAGE_SIZE, GFP_KERNEL); + if (!ptr) + return -1; + + if (*((__u8 *)ptr) !=3D 'a') + return -1; + + /* Shrink: within same page, no page freeing. */ + ptr =3D vrealloc(ptr, PAGE_SIZE / 2, GFP_KERNEL); + if (!ptr) + return -1; + + if (*((__u8 *)ptr) !=3D 'a') + return -1; + + /* Grow: within allocated page, in-place, no realloc. */ + ptr =3D vrealloc(ptr, PAGE_SIZE, GFP_KERNEL); + if (!ptr) + return -1; + + if (*((__u8 *)ptr) !=3D '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[] =3D { { "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. */ }; =20 --=20 2.43.0