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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 13DDBC43603 for ; Tue, 10 Dec 2019 22:37:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DA1662077B for ; Tue, 10 Dec 2019 22:37:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576017437; bh=blLUoTpQ6T7Qmn8UspTegfMLI1oc5yQMRt2rwXI1jhY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=cI7WNOgIwCioP0Iv71y4PcQBj72hodgkJCR0kOak4yViLCRUS1XeS6w16hzw0Q3m6 aaMuHV5uATDv+4S95R4eobTUHxiqM2OD/IQU4IQtexKccdny/+WUig7j56/gPhsejy 3Z+1OIF0fMKc09rGYwm3CAkQawV3LQ5wVcO4Znog= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729600AbfLJWhQ (ORCPT ); Tue, 10 Dec 2019 17:37:16 -0500 Received: from mail.kernel.org ([198.145.29.99]:55362 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730130AbfLJWeG (ORCPT ); Tue, 10 Dec 2019 17:34:06 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 72208208C3; Tue, 10 Dec 2019 22:34:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576017246; bh=blLUoTpQ6T7Qmn8UspTegfMLI1oc5yQMRt2rwXI1jhY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qKLcJqIeAhc2JbVhXuMADuD0m76FWOSDGFn6Kb230q3LSgNXpAGt2SRxDWCLeE19q /8VelP3J7TQElAjnthVvw7ic2NzmZiXG5bXKeb+Mxd2RtThkJ/papBpmOIV7KWWFBZ lCh2OHB5MomNwZdw6ig3AmzPJRJGkha9XP+u3uZ4= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Masami Hiramatsu , Jiri Olsa , Namhyung Kim , Arnaldo Carvalho de Melo , Sasha Levin Subject: [PATCH AUTOSEL 4.4 42/71] perf probe: Walk function lines in lexical blocks Date: Tue, 10 Dec 2019 17:32:47 -0500 Message-Id: <20191210223316.14988-42-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191210223316.14988-1-sashal@kernel.org> References: <20191210223316.14988-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Masami Hiramatsu [ Upstream commit acb6a7047ac2146b723fef69ee1ab6b7143546bf ] Since some inlined functions are in lexical blocks of given function, we have to recursively walk through the DIE tree. Without this fix, perf-probe -L can miss the inlined functions which is in a lexical block (like if (..) { func() } case.) However, even though, to walk the lines in a given function, we don't need to follow the children DIE of inlined functions because those do not have any lines in the specified function. We need to walk though whole trees only if we walk all lines in a given file, because an inlined function can include another inlined function in the same file. Fixes: b0e9cb2802d4 ("perf probe: Fix to search nested inlined functions in CU") Signed-off-by: Masami Hiramatsu Cc: Jiri Olsa Cc: Namhyung Kim Link: http://lore.kernel.org/lkml/157190836514.1859.15996864849678136353.stgit@devnote2 Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Sasha Levin --- tools/perf/util/dwarf-aux.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) diff --git a/tools/perf/util/dwarf-aux.c b/tools/perf/util/dwarf-aux.c index af78d6fc8d12c..ef6fa620a4264 100644 --- a/tools/perf/util/dwarf-aux.c +++ b/tools/perf/util/dwarf-aux.c @@ -664,10 +664,9 @@ static int __die_walk_funclines_cb(Dwarf_Die *in_die, void *data) if (lw->retval != 0) return DIE_FIND_CB_END; } + if (!lw->recursive) + return DIE_FIND_CB_SIBLING; } - if (!lw->recursive) - /* Don't need to search recursively */ - return DIE_FIND_CB_SIBLING; if (addr) { fname = dwarf_decl_file(in_die); @@ -714,6 +713,10 @@ static int __die_walk_culines_cb(Dwarf_Die *sp_die, void *data) { struct __line_walk_param *lw = data; + /* + * Since inlined function can include another inlined function in + * the same file, we need to walk in it recursively. + */ lw->retval = __die_walk_funclines(sp_die, true, lw->callback, lw->data); if (lw->retval != 0) return DWARF_CB_ABORT; @@ -803,8 +806,9 @@ int die_walk_lines(Dwarf_Die *rt_die, line_walk_callback_t callback, void *data) */ if (rt_die != cu_die) /* - * Don't need walk functions recursively, because nested - * inlined functions don't have lines of the specified DIE. + * Don't need walk inlined functions recursively, because + * inner inlined functions don't have the lines of the + * specified function. */ ret = __die_walk_funclines(rt_die, false, callback, data); else { -- 2.20.1