From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 566FAC33CB1 for ; Thu, 16 Jan 2020 15:32:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2D86F2072B for ; Thu, 16 Jan 2020 15:32:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728897AbgAPPca (ORCPT ); Thu, 16 Jan 2020 10:32:30 -0500 Received: from mx2.suse.de ([195.135.220.15]:53756 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726151AbgAPPcQ (ORCPT ); Thu, 16 Jan 2020 10:32:16 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id 289C86A2E5; Thu, 16 Jan 2020 15:32:13 +0000 (UTC) From: Petr Mladek To: Jiri Kosina , Josh Poimboeuf , Miroslav Benes Cc: Joe Lawrence , Kamalesh Babulal , Nicolai Stange , Dan Carpenter , live-patching@vger.kernel.org, linux-kernel@vger.kernel.org, Petr Mladek Subject: [PATCH 2/4] livepatch/selftest: Clean up shadow variable names and type Date: Thu, 16 Jan 2020 16:31:43 +0100 Message-Id: <20200116153145.2392-3-pmladek@suse.com> X-Mailer: git-send-email 2.16.4 In-Reply-To: <20200116153145.2392-1-pmladek@suse.com> References: <20200116153145.2392-1-pmladek@suse.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The shadow variable selftest is quite tricky. Especially it is problematic to understand what values are stored, returned, and printed. Make it easier to understand by using "int *var, **sv" variables consistently everywhere instead of the generic "void *", "ret", and "ctor_data". Signed-off-by: Petr Mladek --- lib/livepatch/test_klp_shadow_vars.c | 93 ++++++++++++++++++++---------------- 1 file changed, 52 insertions(+), 41 deletions(-) diff --git a/lib/livepatch/test_klp_shadow_vars.c b/lib/livepatch/test_klp_shadow_vars.c index fe5c413efe96..4e94f46234e8 100644 --- a/lib/livepatch/test_klp_shadow_vars.c +++ b/lib/livepatch/test_klp_shadow_vars.c @@ -60,36 +60,43 @@ static int ptr_id(void *ptr) */ static void *shadow_get(void *obj, unsigned long id) { - void *ret = klp_shadow_get(obj, id); + int **sv; + sv = klp_shadow_get(obj, id); pr_info("klp_%s(obj=PTR%d, id=0x%lx) = PTR%d\n", - __func__, ptr_id(obj), id, ptr_id(ret)); + __func__, ptr_id(obj), id, ptr_id(sv)); - return ret; + return sv; } static void *shadow_alloc(void *obj, unsigned long id, size_t size, gfp_t gfp_flags, klp_shadow_ctor_t ctor, void *ctor_data) { - void *ret = klp_shadow_alloc(obj, id, size, gfp_flags, ctor, - ctor_data); + int *var = ctor_data; + int **sv; + + sv = klp_shadow_alloc(obj, id, size, gfp_flags, ctor, var); pr_info("klp_%s(obj=PTR%d, id=0x%lx, size=%zx, gfp_flags=%pGg), ctor=PTR%d, ctor_data=PTR%d = PTR%d\n", __func__, ptr_id(obj), id, size, &gfp_flags, ptr_id(ctor), - ptr_id(ctor_data), ptr_id(ret)); - return ret; + ptr_id(var), ptr_id(sv)); + + return sv; } static void *shadow_get_or_alloc(void *obj, unsigned long id, size_t size, gfp_t gfp_flags, klp_shadow_ctor_t ctor, void *ctor_data) { - void *ret = klp_shadow_get_or_alloc(obj, id, size, gfp_flags, ctor, - ctor_data); + int *var = ctor_data; + int **sv; + + sv = klp_shadow_get_or_alloc(obj, id, size, gfp_flags, ctor, var); pr_info("klp_%s(obj=PTR%d, id=0x%lx, size=%zx, gfp_flags=%pGg), ctor=PTR%d, ctor_data=PTR%d = PTR%d\n", __func__, ptr_id(obj), id, size, &gfp_flags, ptr_id(ctor), - ptr_id(ctor_data), ptr_id(ret)); - return ret; + ptr_id(var), ptr_id(sv)); + + return sv; } static void shadow_free(void *obj, unsigned long id, klp_shadow_dtor_t dtor) @@ -110,18 +117,22 @@ static void shadow_free_all(unsigned long id, klp_shadow_dtor_t dtor) /* Shadow variable constructor - remember simple pointer data */ static int shadow_ctor(void *obj, void *shadow_data, void *ctor_data) { - int **shadow_int = shadow_data; - *shadow_int = ctor_data; + int **sv = shadow_data; + int *var = ctor_data; + + *sv = var; pr_info("%s: PTR%d -> PTR%d\n", - __func__, ptr_id(shadow_int), ptr_id(ctor_data)); + __func__, ptr_id(sv), ptr_id(var)); return 0; } static void shadow_dtor(void *obj, void *shadow_data) { + int **sv = shadow_data; + pr_info("%s(obj=PTR%d, shadow_data=PTR%d)\n", - __func__, ptr_id(obj), ptr_id(shadow_data)); + __func__, ptr_id(obj), ptr_id(sv)); } static int test_klp_shadow_vars_init(void) @@ -134,7 +145,7 @@ static int test_klp_shadow_vars_init(void) int var1, var2, var3, var4; int **sv1, **sv2, **sv3, **sv4; - void *ret; + int **sv; ptr_id(NULL); ptr_id(&var1); @@ -146,8 +157,8 @@ static int test_klp_shadow_vars_init(void) * With an empty shadow variable hash table, expect not to find * any matches. */ - ret = shadow_get(obj, id); - if (!ret) + sv = shadow_get(obj, id); + if (!sv) pr_info(" got expected NULL result\n"); /* @@ -169,23 +180,23 @@ static int test_klp_shadow_vars_init(void) * Verify we can find our new shadow variables and that they point * to expected data. */ - ret = shadow_get(obj, id); - if (!ret) + sv = shadow_get(obj, id); + if (!sv) return -EINVAL; - if (ret == sv1 && *sv1 == &var1) + if (sv == sv1 && *sv1 == &var1) pr_info(" got expected PTR%d -> PTR%d result\n", ptr_id(sv1), ptr_id(*sv1)); - ret = shadow_get(obj + 1, id); - if (!ret) + sv = shadow_get(obj + 1, id); + if (!sv) return -EINVAL; - if (ret == sv2 && *sv2 == &var2) + if (sv == sv2 && *sv2 == &var2) pr_info(" got expected PTR%d -> PTR%d result\n", ptr_id(sv2), ptr_id(*sv2)); - ret = shadow_get(obj, id + 1); - if (!ret) + sv = shadow_get(obj, id + 1); + if (!sv) return -EINVAL; - if (ret == sv3 && *sv3 == &var3) + if (sv == sv3 && *sv3 == &var3) pr_info(" got expected PTR%d -> PTR%d result\n", ptr_id(sv3), ptr_id(*sv3)); @@ -197,10 +208,10 @@ static int test_klp_shadow_vars_init(void) if (!sv4) return -ENOMEM; - ret = shadow_get_or_alloc(obj + 2, id, size, gfp_flags, shadow_ctor, &var4); - if (!ret) + sv = shadow_get_or_alloc(obj + 2, id, size, gfp_flags, shadow_ctor, &var4); + if (!sv) return -EINVAL; - if (ret == sv4 && *sv4 == &var4) + if (sv == sv4 && *sv4 == &var4) pr_info(" got expected PTR%d -> PTR%d result\n", ptr_id(sv4), ptr_id(*sv4)); @@ -209,27 +220,27 @@ static int test_klp_shadow_vars_init(void) * longer find them. */ shadow_free(obj, id, shadow_dtor); /* sv1 */ - ret = shadow_get(obj, id); - if (!ret) + sv = shadow_get(obj, id); + if (!sv) pr_info(" got expected NULL result\n"); shadow_free(obj + 1, id, shadow_dtor); /* sv2 */ - ret = shadow_get(obj + 1, id); - if (!ret) + sv = shadow_get(obj + 1, id); + if (!sv) pr_info(" got expected NULL result\n"); shadow_free(obj + 2, id, shadow_dtor); /* sv4 */ - ret = shadow_get(obj + 2, id); - if (!ret) + sv = shadow_get(obj + 2, id); + if (!sv) pr_info(" got expected NULL result\n"); /* * We should still find an variable. */ - ret = shadow_get(obj, id + 1); - if (!ret) + sv = shadow_get(obj, id + 1); + if (!sv) return -EINVAL; - if (ret == sv3 && *sv3 == &var3) + if (sv == sv3 && *sv3 == &var3) pr_info(" got expected PTR%d -> PTR%d result\n", ptr_id(sv3), ptr_id(*sv3)); @@ -237,8 +248,8 @@ static int test_klp_shadow_vars_init(void) * Free all the variables, too. */ shadow_free_all(id + 1, shadow_dtor); /* sv3 */ - ret = shadow_get(obj, id); - if (!ret) + sv = shadow_get(obj, id); + if (!sv) pr_info(" shadow_get() got expected NULL result\n"); -- 2.16.4