From patchwork Sat Jan 1 03:33:28 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Frank Rowand X-Patchwork-Id: 529491 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 75763C433FE for ; Sat, 1 Jan 2022 03:33:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232006AbiAADdj (ORCPT ); Fri, 31 Dec 2021 22:33:39 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41188 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232001AbiAADdj (ORCPT ); Fri, 31 Dec 2021 22:33:39 -0500 Received: from mail-qt1-x82c.google.com (mail-qt1-x82c.google.com [IPv6:2607:f8b0:4864:20::82c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A6C91C06173E; Fri, 31 Dec 2021 19:33:38 -0800 (PST) Received: by mail-qt1-x82c.google.com with SMTP id p19so25447654qtw.12; Fri, 31 Dec 2021 19:33:38 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=0/QUXGuUmCgqGwWw+2nWvnPCOvClaTQspM6COZ2NY0k=; b=OP13XCwkX7mq6PP2h0+m3mXoMQ0WEcPQ5vSEd7c3cjd06AfxcJxVEOZ5WifeWDiQDx nSTKhCu2KqJ+cVxApx4J30O1tMbcIKkvqfBMjBLeU6jI9vicgJrt/h4PIQIJDYjdbw4+ HEEI6xBZEhueHA1W2/nwXo3e0iHCu4XwJlEDOFL6QvoR8mqOLuDq4odsUg4XrYFM8GRI PkMievS8dD1Wom8QBExM6GB7wBqJg/xXJTNFRVzLBJjjcFuS1OYnRkvAajxjgOZuee1R xO/7B8pkkL6+oJt94YUUo2sEyWCWAQ+PjmizBXhEc734uIXQQBwmyXJI7jPJ2o5bOOUQ 92fg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=0/QUXGuUmCgqGwWw+2nWvnPCOvClaTQspM6COZ2NY0k=; b=GpKzau8X4lEwn9YO1KZbv8YMndnmHiG0iHwg+KvAzAG1B3yj3rtOVUZw/pHaL09E8M Q9Ah4/lqGS4Ouhl09N99Gqg/LmRpxVu+V7nF1VV+NctiITiPwgi06u5xhQlw3m4Qgq4o CrW/iFW272zjKNYg0MlWMgLeUoGGZTJ5apztMd97ldJZEJMAjHlxOB9WuSSiZBluCnRL xwyvSRYP7uU2BzULK0akD6c6Tyw19l7dG3lThCDcfDH9z80ns29mjm7oKPDqWafW7f4L FeYDmuFqxVIsxdDQdpybrlx+YNxfnO9/0XlEGaYyIckykzd/+TVEvDwarZ43bnEEJaFh xdww== X-Gm-Message-State: AOAM531dc91x4cKvrNjTlvf0RtRZjKQgxBk7SggiEZeomjU4czC6GoUH oN/5ApOZxztH3Md4rpn8Rf/3hTWM9hw= X-Google-Smtp-Source: ABdhPJyC3mgDgblToT0ZS9KXelO6WouefshI+RPoaC8fjsPFkpEgrfknO4BI1PoTD37z6Zs31kyEWQ== X-Received: by 2002:a05:622a:1a03:: with SMTP id f3mr33531443qtb.141.1641008017847; Fri, 31 Dec 2021 19:33:37 -0800 (PST) Received: from localhost.localdomain (c-67-187-90-124.hsd1.ky.comcast.net. [67.187.90.124]) by smtp.gmail.com with ESMTPSA id x4sm24132867qtw.44.2021.12.31.19.33.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 31 Dec 2021 19:33:37 -0800 (PST) From: frowand.list@gmail.com To: Rob Herring , erhard_f@mailbox.org, yinxiujiang@kylinos.cn Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 1/2] of: unittest: change references to obsolete overlay id Date: Fri, 31 Dec 2021 21:33:28 -0600 Message-Id: <20220101033329.1277779-2-frowand.list@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220101033329.1277779-1-frowand.list@gmail.com> References: <20220101033329.1277779-1-frowand.list@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org From: Frank Rowand Unittest inconsistently interchanges overlay changeset id and overlay id. Change variable names of overlay id to overlay changeset id. Do not fix variable names in the overlay tracking functions of_unittest_overlay_tracked(), of_unittest_track_overlay(), and of_unittest_destroy_tracked_overlays() which will be replaced in a following commit. Signed-off-by: Frank Rowand --- drivers/of/unittest.c | 54 +++++++++++++++++++++---------------------- 1 file changed, 27 insertions(+), 27 deletions(-) diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c index 481ba8682ebf..33c458044600 100644 --- a/drivers/of/unittest.c +++ b/drivers/of/unittest.c @@ -1492,7 +1492,7 @@ static int __init unittest_data_add(void) } #ifdef CONFIG_OF_OVERLAY -static int __init overlay_data_apply(const char *overlay_name, int *overlay_id); +static int __init overlay_data_apply(const char *overlay_name, int *ovcs_id); static int unittest_probe(struct platform_device *pdev) { @@ -1973,18 +1973,18 @@ static void of_unittest_destroy_tracked_overlays(void) } while (defers > 0); } -static int __init of_unittest_apply_overlay(int overlay_nr, int *overlay_id) +static int __init of_unittest_apply_overlay(int overlay_nr, int *ovcs_id) { const char *overlay_name; overlay_name = overlay_name_from_nr(overlay_nr); - if (!overlay_data_apply(overlay_name, overlay_id)) { + if (!overlay_data_apply(overlay_name, ovcs_id)) { unittest(0, "could not apply overlay \"%s\"\n", overlay_name); return -EFAULT; } - of_unittest_track_overlay(*overlay_id); + of_unittest_track_overlay(*ovcs_id); return 0; } @@ -2029,7 +2029,7 @@ static int __init of_unittest_apply_revert_overlay_check(int overlay_nr, int unittest_nr, int before, int after, enum overlay_type ovtype) { - int ret, ovcs_id, save_id; + int ret, ovcs_id, save_ovcs_id; /* unittest device must be in before state */ if (of_unittest_device_exists(unittest_nr, ovtype) != before) { @@ -2057,7 +2057,7 @@ static int __init of_unittest_apply_revert_overlay_check(int overlay_nr, return -EINVAL; } - save_id = ovcs_id; + save_ovcs_id = ovcs_id; ret = of_overlay_remove(&ovcs_id); if (ret != 0) { unittest(0, "%s failed to be destroyed @\"%s\"\n", @@ -2065,7 +2065,7 @@ static int __init of_unittest_apply_revert_overlay_check(int overlay_nr, unittest_path(unittest_nr, ovtype)); return ret; } - of_unittest_untrack_overlay(save_id); + of_unittest_untrack_overlay(save_ovcs_id); /* unittest device must be again in before state */ if (of_unittest_device_exists(unittest_nr, PDEV_OVERLAY) != before) { @@ -2192,7 +2192,7 @@ static void __init of_unittest_overlay_5(void) /* test overlay application in sequence */ static void __init of_unittest_overlay_6(void) { - int i, ov_id[2], ovcs_id; + int i, save_ovcs_id[2], ovcs_id; int overlay_nr = 6, unittest_nr = 6; int before = 0, after = 1; const char *overlay_name; @@ -2225,8 +2225,8 @@ static void __init of_unittest_overlay_6(void) unittest(0, "could not apply overlay \"%s\"\n", overlay_name); return; } - ov_id[0] = ovcs_id; - of_unittest_track_overlay(ov_id[0]); + save_ovcs_id[0] = ovcs_id; + of_unittest_track_overlay(ovcs_id); EXPECT_END(KERN_INFO, "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest6/status"); @@ -2242,8 +2242,8 @@ static void __init of_unittest_overlay_6(void) unittest(0, "could not apply overlay \"%s\"\n", overlay_name); return; } - ov_id[1] = ovcs_id; - of_unittest_track_overlay(ov_id[1]); + save_ovcs_id[1] = ovcs_id; + of_unittest_track_overlay(ovcs_id); EXPECT_END(KERN_INFO, "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest7/status"); @@ -2263,7 +2263,7 @@ static void __init of_unittest_overlay_6(void) } for (i = 1; i >= 0; i--) { - ovcs_id = ov_id[i]; + ovcs_id = save_ovcs_id[i]; if (of_overlay_remove(&ovcs_id)) { unittest(0, "%s failed destroy @\"%s\"\n", overlay_name_from_nr(overlay_nr + i), @@ -2271,7 +2271,7 @@ static void __init of_unittest_overlay_6(void) PDEV_OVERLAY)); return; } - of_unittest_untrack_overlay(ov_id[i]); + of_unittest_untrack_overlay(save_ovcs_id[i]); } for (i = 0; i < 2; i++) { @@ -2294,7 +2294,7 @@ static void __init of_unittest_overlay_6(void) /* test overlay application in sequence */ static void __init of_unittest_overlay_8(void) { - int i, ov_id[2], ovcs_id; + int i, save_ovcs_id[2], ovcs_id; int overlay_nr = 8, unittest_nr = 8; const char *overlay_name; int ret; @@ -2316,8 +2316,8 @@ static void __init of_unittest_overlay_8(void) if (!ret) return; - ov_id[0] = ovcs_id; - of_unittest_track_overlay(ov_id[0]); + save_ovcs_id[0] = ovcs_id; + of_unittest_track_overlay(ovcs_id); overlay_name = overlay_name_from_nr(overlay_nr + 1); @@ -2335,11 +2335,11 @@ static void __init of_unittest_overlay_8(void) return; } - ov_id[1] = ovcs_id; - of_unittest_track_overlay(ov_id[1]); + save_ovcs_id[1] = ovcs_id; + of_unittest_track_overlay(ovcs_id); /* now try to remove first overlay (it should fail) */ - ovcs_id = ov_id[0]; + ovcs_id = save_ovcs_id[0]; EXPECT_BEGIN(KERN_INFO, "OF: overlay: node_overlaps_later_cs: #6 overlaps with #7 @/testcase-data/overlay-node/test-bus/test-unittest8"); @@ -2365,7 +2365,7 @@ static void __init of_unittest_overlay_8(void) /* removing them in order should work */ for (i = 1; i >= 0; i--) { - ovcs_id = ov_id[i]; + ovcs_id = save_ovcs_id[i]; if (of_overlay_remove(&ovcs_id)) { unittest(0, "%s not destroyed @\"%s\"\n", overlay_name_from_nr(overlay_nr + i), @@ -2373,7 +2373,7 @@ static void __init of_unittest_overlay_8(void) PDEV_OVERLAY)); return; } - of_unittest_untrack_overlay(ov_id[i]); + of_unittest_untrack_overlay(save_ovcs_id[i]); } unittest(1, "overlay test %d passed\n", 8); @@ -2837,7 +2837,7 @@ struct overlay_info { uint8_t *dtb_begin; uint8_t *dtb_end; int expected_result; - int overlay_id; + int ovcs_id; char *name; }; @@ -2991,7 +2991,7 @@ void __init unittest_unflatten_overlay_base(void) * * Return 0 on unexpected error. */ -static int __init overlay_data_apply(const char *overlay_name, int *overlay_id) +static int __init overlay_data_apply(const char *overlay_name, int *ovcs_id) { struct overlay_info *info; int found = 0; @@ -3013,9 +3013,9 @@ static int __init overlay_data_apply(const char *overlay_name, int *overlay_id) if (!size) pr_err("no overlay data for %s\n", overlay_name); - ret = of_overlay_fdt_apply(info->dtb_begin, size, &info->overlay_id); - if (overlay_id) - *overlay_id = info->overlay_id; + ret = of_overlay_fdt_apply(info->dtb_begin, size, &info->ovcs_id); + if (ovcs_id) + *ovcs_id = info->ovcs_id; if (ret < 0) goto out; From patchwork Sat Jan 1 03:33:29 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Frank Rowand X-Patchwork-Id: 529566 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7D5D5C433EF for ; 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[67.187.90.124]) by smtp.gmail.com with ESMTPSA id x4sm24132867qtw.44.2021.12.31.19.33.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 31 Dec 2021 19:33:38 -0800 (PST) From: frowand.list@gmail.com To: Rob Herring , erhard_f@mailbox.org, yinxiujiang@kylinos.cn Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/2] of: unittest: re-implement overlay tracking Date: Fri, 31 Dec 2021 21:33:29 -0600 Message-Id: <20220101033329.1277779-3-frowand.list@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220101033329.1277779-1-frowand.list@gmail.com> References: <20220101033329.1277779-1-frowand.list@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org From: Frank Rowand Some overlays are tracked when they are applied. The tracked overlays are later removed after the overlay tests are completed. The old implementation makes assumptions about the expected values for overlay changeset id created by the overlay apply which result in fragile code. The new code removes the assumptions. A symptom that exposes a problem with the tracking code is a warning "UBSAN: shift-out-of-bounds in drivers/of/unittest.c:1933:36", Kernel Version: 5.15-rc7, PPC-64, Talos II. This results from variable "id" value of -1 in the final line of of_unittest_untrack_overlay(). Reported-by: erhard_f@mailbox.org Signed-off-by: Frank Rowand --- drivers/of/unittest.c | 110 +++++++++++++++++++----------------------- 1 file changed, 49 insertions(+), 61 deletions(-) diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c index 33c458044600..e2807014cbe7 100644 --- a/drivers/of/unittest.c +++ b/drivers/of/unittest.c @@ -1657,7 +1657,7 @@ static void __init of_unittest_overlay_gpio(void) * The overlays are applied by overlay_data_apply() * instead of of_unittest_apply_overlay() so that they * will not be tracked. Thus they will not be removed - * by of_unittest_destroy_tracked_overlays(). + * by of_unittest_remove_tracked_overlays(). * * - apply overlay_gpio_01 * - apply overlay_gpio_02a @@ -1905,86 +1905,70 @@ static const char *overlay_name_from_nr(int nr) static const char *bus_path = "/testcase-data/overlay-node/test-bus"; -/* FIXME: it is NOT guaranteed that overlay ids are assigned in sequence */ +#define MAX_TRACK_OVCS_IDS 256 -#define MAX_UNITTEST_OVERLAYS 256 -static unsigned long overlay_id_bits[BITS_TO_LONGS(MAX_UNITTEST_OVERLAYS)]; -static int overlay_first_id = -1; +static int track_ovcs_id[MAX_TRACK_OVCS_IDS]; +static int track_ovcs_id_overlay_nr[MAX_TRACK_OVCS_IDS]; +static int track_ovcs_id_cnt; -static long of_unittest_overlay_tracked(int id) +static void of_unittest_track_overlay(int ovcs_id, int overlay_nr) { - if (WARN_ON(id >= MAX_UNITTEST_OVERLAYS)) - return 0; - return overlay_id_bits[BIT_WORD(id)] & BIT_MASK(id); -} - -static void of_unittest_track_overlay(int id) -{ - if (overlay_first_id < 0) - overlay_first_id = id; - id -= overlay_first_id; - - if (WARN_ON(id >= MAX_UNITTEST_OVERLAYS)) + if (WARN_ON(track_ovcs_id_cnt >= MAX_TRACK_OVCS_IDS)) return; - overlay_id_bits[BIT_WORD(id)] |= BIT_MASK(id); + + track_ovcs_id[track_ovcs_id_cnt] = ovcs_id; + track_ovcs_id_overlay_nr[track_ovcs_id_cnt] = overlay_nr; + track_ovcs_id_cnt++; } -static void of_unittest_untrack_overlay(int id) +static void of_unittest_untrack_overlay(int ovcs_id) { - if (overlay_first_id < 0) + if (WARN_ON(track_ovcs_id_cnt < 1)) return; - id -= overlay_first_id; - if (WARN_ON(id >= MAX_UNITTEST_OVERLAYS)) - return; - overlay_id_bits[BIT_WORD(id)] &= ~BIT_MASK(id); -} -static void of_unittest_destroy_tracked_overlays(void) -{ - int id, ret, defers, ovcs_id; + track_ovcs_id_cnt--; - if (overlay_first_id < 0) - return; + /* If out of synch then test is broken. Do not try to recover. */ + WARN_ON(track_ovcs_id[track_ovcs_id_cnt] != ovcs_id); +} - /* try until no defers */ - do { - defers = 0; - /* remove in reverse order */ - for (id = MAX_UNITTEST_OVERLAYS - 1; id >= 0; id--) { - if (!of_unittest_overlay_tracked(id)) - continue; +static void of_unittest_remove_tracked_overlays(void) +{ + int ret, ovcs_id, overlay_nr, save_ovcs_id; + const char *overlay_name; - ovcs_id = id + overlay_first_id; - ret = of_overlay_remove(&ovcs_id); - if (ret == -ENODEV) { - pr_warn("%s: no overlay to destroy for #%d\n", - __func__, id + overlay_first_id); - continue; - } - if (ret != 0) { - defers++; - pr_warn("%s: overlay destroy failed for #%d\n", - __func__, id + overlay_first_id); - continue; - } + while (track_ovcs_id_cnt > 0) { - of_unittest_untrack_overlay(id); + ovcs_id = track_ovcs_id[track_ovcs_id_cnt - 1]; + overlay_nr = track_ovcs_id_overlay_nr[track_ovcs_id_cnt - 1]; + save_ovcs_id = ovcs_id; + ret = of_overlay_remove(&ovcs_id); + if (ret == -ENODEV) { + overlay_name = overlay_name_from_nr(overlay_nr); + pr_warn("%s: of_overlay_remove() for overlay \"%s\" failed, ret = %d\n", + __func__, overlay_name, ret); } - } while (defers > 0); + of_unittest_untrack_overlay(save_ovcs_id); + }; + } static int __init of_unittest_apply_overlay(int overlay_nr, int *ovcs_id) { + /* + * The overlay will be tracked, thus it will be removed + * by of_unittest_remove_tracked_overlays(). + */ + const char *overlay_name; overlay_name = overlay_name_from_nr(overlay_nr); if (!overlay_data_apply(overlay_name, ovcs_id)) { - unittest(0, "could not apply overlay \"%s\"\n", - overlay_name); + unittest(0, "could not apply overlay \"%s\"\n", overlay_name); return -EFAULT; } - of_unittest_track_overlay(*ovcs_id); + of_unittest_track_overlay(*ovcs_id, overlay_nr); return 0; } @@ -2226,7 +2210,7 @@ static void __init of_unittest_overlay_6(void) return; } save_ovcs_id[0] = ovcs_id; - of_unittest_track_overlay(ovcs_id); + of_unittest_track_overlay(ovcs_id, overlay_nr + 0); EXPECT_END(KERN_INFO, "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest6/status"); @@ -2243,7 +2227,7 @@ static void __init of_unittest_overlay_6(void) return; } save_ovcs_id[1] = ovcs_id; - of_unittest_track_overlay(ovcs_id); + of_unittest_track_overlay(ovcs_id, overlay_nr + 1); EXPECT_END(KERN_INFO, "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest7/status"); @@ -2317,7 +2301,7 @@ static void __init of_unittest_overlay_8(void) return; save_ovcs_id[0] = ovcs_id; - of_unittest_track_overlay(ovcs_id); + of_unittest_track_overlay(ovcs_id, overlay_nr + 0); overlay_name = overlay_name_from_nr(overlay_nr + 1); @@ -2336,7 +2320,7 @@ static void __init of_unittest_overlay_8(void) } save_ovcs_id[1] = ovcs_id; - of_unittest_track_overlay(ovcs_id); + of_unittest_track_overlay(ovcs_id, overlay_nr + 1); /* now try to remove first overlay (it should fail) */ ovcs_id = save_ovcs_id[0]; @@ -2356,6 +2340,10 @@ static void __init of_unittest_overlay_8(void) "OF: overlay: node_overlaps_later_cs: #6 overlaps with #7 @/testcase-data/overlay-node/test-bus/test-unittest8"); if (!ret) { + /* + * Should never get here. If we do, expect a lot of + * subsequent tracking and overlay removal related errors. + */ unittest(0, "%s was destroyed @\"%s\"\n", overlay_name_from_nr(overlay_nr + 0), unittest_path(unittest_nr, @@ -2805,7 +2793,7 @@ static void __init of_unittest_overlay(void) of_unittest_overlay_gpio(); - of_unittest_destroy_tracked_overlays(); + of_unittest_remove_tracked_overlays(); out: of_node_put(bus_np);