From nobody Fri Apr 3 16:19:06 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 457093E024F for ; Tue, 24 Mar 2026 10:00:33 +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=1774346433; cv=none; b=dIyQEjWeu1r7umm/PLVL52tHfx4Ii+Aakld95+xpA8J81BqZztrXCUl9bIl9QIqjG+9wHVatWzwV2yUuGFB+r5x5/LL/T3byxYAXsWLzpxavaSZKGc2EpC7EwNTa2UI4eh/QOhFrMhnNChJAYXG4EBOJJQk/UnZRLfV/dDyttik= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774346433; c=relaxed/simple; bh=6f7TOEvk+v4ej1arN46RE3RzMBqAOnaX4qdIPzrc6Wc=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=cTM9sSbN1S9BNycYFbwsArtdCYfB/VDrC2q9UKOBAunody8lMeLx+YC9uNfvB/XSo9jo5ZkTOqmERPQaQfejLcnXgt6nG06DYajd3jtwZcYGQo5B4kU7gKAckp3fKQzg1ZlbgIG0NZjG+HnDFi0qMPwMZ4pL+QzZDu409ELO8Pk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=t7d4aquf; 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="t7d4aquf" Received: by smtp.kernel.org (Postfix) with ESMTPS id F1656C2BCC7; Tue, 24 Mar 2026 10:00:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774346433; bh=6f7TOEvk+v4ej1arN46RE3RzMBqAOnaX4qdIPzrc6Wc=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=t7d4aquf9ItiXQ/V3qTovPcariGkr6uT2eOuxxoQDQxWhDVsgznPqBGgEt/DY/lca blIQdcCA85fis+WXojOw3O9O+Xetf9RXFOx08UuSPpf9NyeBDvz9dEYQWfAkBPTL7+ rhvjcgtfKcXqYDCwXKfdlVYTOcgfi6LN+eYD34CKIqq9zYYDlh6QZGUtZfksEDMCRI hZnTI7UPXzj+ApKLCMkOF/HA7HV+kgHkEwqqhxRzDw9b2mNdZ8xiRdADAEBOh4Q2EU +uhiXC6lONssBaa+1thggtCrBekXHVSW4oEpwtftqw4lYYAmfmg9SQMiBCQjguHG+n 26azKymrbiisw== 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 EA4CDE9A75C; Tue, 24 Mar 2026 10:00:32 +0000 (UTC) From: Shivam Kalra via B4 Relay Date: Tue, 24 Mar 2026 15:30:31 +0530 Subject: [PATCH v7 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: <20260324-vmalloc-shrink-v7-6-c0e62b8e5d83@zohomail.in> References: <20260324-vmalloc-shrink-v7-0-c0e62b8e5d83@zohomail.in> In-Reply-To: <20260324-vmalloc-shrink-v7-0-c0e62b8e5d83@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=1774346430; l=2848; i=shivamkalra98@zohomail.in; s=20260212; h=from:subject:message-id; bh=q1HLhsQQ92caXQ9Tt0laK39H3cv2PUzBofvprsTi44k=; b=BEPTytl4CB3BkcU9Nf+8kk+Rt9BywSe/EuCrTiSmPF99Nwk8oIMH3YmkayqBpuiXrPub0paHm Ibp4V+UQChFCtBgC+E78zmGRwm6aMpqHl26Uu+vIgXrRTK92fNYaxi+ 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..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. */ ); =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 vrealloc(NULL, PAGE_SIZE, GFP_KERNEL); + 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