From patchwork Tue Aug 30 21:48:53 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Suren Baghdasaryan X-Patchwork-Id: 12959934 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 CA264ECAAD4 for ; Tue, 30 Aug 2022 21:50:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231888AbiH3VuP (ORCPT ); Tue, 30 Aug 2022 17:50:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55796 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231801AbiH3Vti (ORCPT ); Tue, 30 Aug 2022 17:49:38 -0400 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5898F90199 for ; Tue, 30 Aug 2022 14:49:35 -0700 (PDT) Received: by mail-yb1-xb4a.google.com with SMTP id i194-20020a253bcb000000b00676d86fc5d7so708292yba.9 for ; Tue, 30 Aug 2022 14:49:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc; bh=Ximx3byfJ7rLtdPEIh1Ra0raz9MzgSTr/ga3ge5UvWM=; b=hlMw9ssXTclldlCaHPrcXJ+C8bd3xApn5Llhx/6gZpRfRlRJOwhqWghtr5RVB1LK2v 8FfTzwl4OCrCjFuadtzRuPxbLUjQJudmMLjVKcB1W8L4nbh23VnBIJLeDBpv1hunXsFS TNZP/OkUwJBjRdLHnTFXsfbD3FCLleefIIXeH80z2Nq7UmGRffrhNJtzi3K0o37plX80 MxuLJZry+KmCa87qIRicDj7F3K2/cxyGqrCNJyg48FflYe+16BIsOuCNrNLVMYU6qqtM jxbTTAqnCt+yOzPfECe6hBLshpNDmGjFaoiWgb1ccH/WG7XlQYWhlthKRprfEZxNn5xs 7PgA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc; bh=Ximx3byfJ7rLtdPEIh1Ra0raz9MzgSTr/ga3ge5UvWM=; b=v8MQSxCHA+efW1RWw4728UAX2BVl5V6cMksdsZeeZV8J24tGKKRVIGWYKNv1Mtdz3W tI41BEdzwOpvr4Run8BRim8ikU8rZMyApNYFvlDvF2Sv5Dww6qGCxoqmKCaV6Ve/KEPn qIMQnWBr596ZROrotIAGlCe2U8Tcw8q8wNTwIiPAoOiJrMkg3KThTj2uBXve/JIGgVuL QPMBL6j2p7aKXqBDxzp1CcFSDaGVEmB0xvwKPwxYjSkcs8d9pPsk67gbs+hpGt/Gq7pI 3e+DwiQtim/afkZriuj/QeLfwsAH9xeHT1T0eM06RQ2+CWnqTLx+9yQ8hDtOyEokJkWC ZlfQ== X-Gm-Message-State: ACgBeo0vlhuz7OEWS9ncZmlITLTxwB0jaYo4CoAc7AQ5VWg0Pd8aJJjN TDUK74BxBOBjLoYU9W94dibOE/fWY3U= X-Google-Smtp-Source: AA6agR7neVKTaIOQpaQTJJtMxLoXgZYEqvCUk9V+fUBv2iEO9EJWDyjyjmM2UWOPn+DCBvrBJ11meMcGOpo= X-Received: from surenb-desktop.mtv.corp.google.com ([2620:15c:211:200:a005:55b3:6c26:b3e4]) (user=surenb job=sendgmr) by 2002:a0d:d98c:0:b0:33d:c482:9714 with SMTP id b134-20020a0dd98c000000b0033dc4829714mr15776751ywe.415.1661896174717; Tue, 30 Aug 2022 14:49:34 -0700 (PDT) Date: Tue, 30 Aug 2022 14:48:53 -0700 In-Reply-To: <20220830214919.53220-1-surenb@google.com> Mime-Version: 1.0 References: <20220830214919.53220-1-surenb@google.com> X-Mailer: git-send-email 2.37.2.672.g94769d06f0-goog Message-ID: <20220830214919.53220-5-surenb@google.com> Subject: [RFC PATCH 04/30] scripts/kallysms: Always include __start and __stop symbols From: Suren Baghdasaryan To: akpm@linux-foundation.org Cc: kent.overstreet@linux.dev, mhocko@suse.com, vbabka@suse.cz, hannes@cmpxchg.org, roman.gushchin@linux.dev, mgorman@suse.de, dave@stgolabs.net, willy@infradead.org, liam.howlett@oracle.com, void@manifault.com, peterz@infradead.org, juri.lelli@redhat.com, ldufour@linux.ibm.com, peterx@redhat.com, david@redhat.com, axboe@kernel.dk, mcgrof@kernel.org, masahiroy@kernel.org, nathan@kernel.org, changbin.du@intel.com, ytcoode@gmail.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, bristot@redhat.com, vschneid@redhat.com, cl@linux.com, penberg@kernel.org, iamjoonsoo.kim@lge.com, 42.hyeyoo@gmail.com, glider@google.com, elver@google.com, dvyukov@google.com, shakeelb@google.com, songmuchun@bytedance.com, arnd@arndb.de, jbaron@akamai.com, rientjes@google.com, minchan@google.com, kaleshsingh@google.com, surenb@google.com, kernel-team@android.com, linux-mm@kvack.org, iommu@lists.linux.dev, kasan-dev@googlegroups.com, io-uring@vger.kernel.org, linux-arch@vger.kernel.org, xen-devel@lists.xenproject.org, linux-bcache@vger.kernel.org, linux-modules@vger.kernel.org, linux-kernel@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org From: Kent Overstreet These symbols are used to denote section boundaries: by always including them we can unify loading sections from modules with loading built-in sections, which leads to some significant cleanup. Signed-off-by: Kent Overstreet --- scripts/kallsyms.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c index f18e6dfc68c5..3d51639a595d 100644 --- a/scripts/kallsyms.c +++ b/scripts/kallsyms.c @@ -263,6 +263,11 @@ static int symbol_in_range(const struct sym_entry *s, return 0; } +static bool string_starts_with(const char *s, const char *prefix) +{ + return strncmp(s, prefix, strlen(prefix)) == 0; +} + static int symbol_valid(const struct sym_entry *s) { const char *name = sym_name(s); @@ -270,6 +275,14 @@ static int symbol_valid(const struct sym_entry *s) /* if --all-symbols is not specified, then symbols outside the text * and inittext sections are discarded */ if (!all_symbols) { + /* + * Symbols starting with __start and __stop are used to denote + * section boundaries, and should always be included: + */ + if (string_starts_with(name, "__start_") || + string_starts_with(name, "__stop_")) + return 1; + if (symbol_in_range(s, text_ranges, ARRAY_SIZE(text_ranges)) == 0) return 0;