From nobody Sat Apr 4 02:06:03 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 CB2A2326D73 for ; Sat, 21 Mar 2026 18:05:53 +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=1774116353; cv=none; b=r+3twDNL5CIZKbzeD4H/HHGxs0yU5quVT+SI58PUWCfUYfVh1BJ3eCFj25E2ANDudwsZWFjgSswkqFCZotKFr+/k90XBZUIKmyjrMQ/Ab5CE9/1/jiWy79eBL/5i+Jg4O3IwGNsfX6TBPNHmYa4drlN65gTzAkQBYxoROPaPKhs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774116353; c=relaxed/simple; bh=9bqC5ujVWHb7sWXrNInVzlf5UOUlvn2ar1xzfw2jX1I=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=B9jzYxHK3um/ei6j9Ho1V/IPID/RRk+h+7Givm7XP1+/2OmnhsE/VA1p0P0Tm7Fp5rcvShUmGJIjGROwlqiQBntbGfhFTZKFFkMox60fn39J54hH8uBXDltWOxDforso5DVc1c2hp0TEH13jnGNLUAISvM/4ICV//ioeS2dfgvE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=VzoOgJeF; 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="VzoOgJeF" Received: by smtp.kernel.org (Postfix) with ESMTPS id A21D8C2BCB1; Sat, 21 Mar 2026 18:05:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774116353; bh=9bqC5ujVWHb7sWXrNInVzlf5UOUlvn2ar1xzfw2jX1I=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=VzoOgJeFrP3udqQQTFkc225kZwa2LrjN4eBtMprzGpM5CSTqTfvOagYMOTBpK0byL /E7NO7rzYd63+oMCUGcFeQV7kgBqq6Ob47gPb5EQGUjdIopLVU/8bFPwRSNS0lXfPo 73RWLFH2mFoMkVQHJaGRr/tmdBWLTU7g9G+ZBCH2qv5+YlTOdF1OC023QDErAAGMJB YcxqX/JVSppS1R+FDP02dcMl9FJSX1LGwBSHEIPNIxnkkZYkgJekHJrpA3Htzg9pbs V3DKG6+wDf58gdFbyg5IUN5MLlM0b7cH4FJQ5ML5kI6ltumW8psNRWYNOmnBSv8af/ v3Isg5cGrxkbQ== 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 98B1F109448B; Sat, 21 Mar 2026 18:05:53 +0000 (UTC) From: Shivam Kalra via B4 Relay Date: Sat, 21 Mar 2026 23:35:51 +0530 Subject: [PATCH v6 6/6] 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: <20260321-vmalloc-shrink-v6-6-062ca7b7ceb2@zohomail.in> References: <20260321-vmalloc-shrink-v6-0-062ca7b7ceb2@zohomail.in> In-Reply-To: <20260321-vmalloc-shrink-v6-0-062ca7b7ceb2@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=1774116351; l=2829; i=shivamkalra98@zohomail.in; s=20260212; h=from:subject:message-id; bh=CtQwnpMQocxytVG/1g8li/Ip2q6UVo/IWXgqeQX4pgY=; b=2kxGypkdmPFqpovzEYndnxajXkv892H1Ygv2DTuJh3mpZUYOsFS0e2md3H5567P88Hlk1ecoQ DKohaljaoF7BQHlLow50Jup+4M+3hcKIzHBhcn+6/9Nh2ApcvG3RTF6 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 | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++= ++++ 1 file changed, 62 insertions(+) diff --git a/lib/test_vmalloc.c b/lib/test_vmalloc.c index 876c72c18a0c..e822830f0887 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 +422,66 @@ vm_map_ram_test(void) return nr_allocated !=3D map_nr_pages; } =20 +static int vrealloc_test(void) +{ + void *ptr, *tmp; + int i; + + for (i =3D 0; i < test_loop_count; i++) { + int err =3D -1; + + ptr =3D vmalloc(PAGE_SIZE); + if (!ptr) + return -1; + + *((__u8 *)ptr) =3D 'a'; + + /* Grow: beyond allocated pages, triggers full realloc. */ + tmp =3D vrealloc(ptr, 4 * PAGE_SIZE, GFP_KERNEL); + if (!tmp) + goto error; + ptr =3D tmp; + + if (*((__u8 *)ptr) !=3D 'a') + goto error; + + /* Shrink: crosses page boundary, frees tail pages. */ + tmp =3D vrealloc(ptr, PAGE_SIZE, GFP_KERNEL); + if (!tmp) + goto error; + ptr =3D tmp; + + if (*((__u8 *)ptr) !=3D 'a') + goto error; + + /* Shrink: within same page, no page freeing. */ + tmp =3D vrealloc(ptr, PAGE_SIZE / 2, GFP_KERNEL); + if (!tmp) + goto error; + ptr =3D tmp; + + if (*((__u8 *)ptr) !=3D 'a') + goto error; + + /* Grow: within allocated page, in-place, no realloc. */ + tmp =3D vrealloc(ptr, PAGE_SIZE, GFP_KERNEL); + if (!tmp) + goto error; + ptr =3D tmp; + + if (*((__u8 *)ptr) !=3D 'a') + goto error; + + err =3D 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[] =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