From nobody Sun Feb 8 09:27:47 2026 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 13528C7EE29 for ; Fri, 9 Jun 2023 07:50:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239386AbjFIHth (ORCPT ); Fri, 9 Jun 2023 03:49:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55006 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239130AbjFIHrr (ORCPT ); Fri, 9 Jun 2023 03:47:47 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5FCC830D1; Fri, 9 Jun 2023 00:47:44 -0700 (PDT) Date: Fri, 09 Jun 2023 07:47:41 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1686296862; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=lPLNXf9zWyzWyCwmesDgnVebog7KOM+Va2Vyt9T/g5Q=; b=tVEDJ6LVH1R5m+I68OIqDMMQMtOUUZShNe8op2Jqn57N9+VYeg/bSbQ5N2FG3RsgoZvFxG FiKP6QI4skTN8ptwW231MeBpW88xzqtO7y/5AYJgd+h/AdpafOOtgxDmL0lr4p/GWwhxd6 VajwILC0GDHj6bMcrrzTug3HGSJU5HC1qlS+E7xqh2Hl87df/AsHMD0nAxnFelp/SJqe0s 7NiuFey9m2YPul0a+fVmCVRGR422EeDbyk1nvUtfonaEx23OdU420IC+xkz+0ARYZdMU5L vN0r51k9L6FiDMj5sa6jJJ0CpfVjZCebcvX5NNeC3Pu57Qt2DoIcDi+9MfYGDg== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1686296862; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=lPLNXf9zWyzWyCwmesDgnVebog7KOM+Va2Vyt9T/g5Q=; b=1gBi7ubdBLao5CQ2lQRyZUQhYNL5vemHJQKQ05O/MsEaGzQMdCWWrStUA90+tZcqx45bbm QY8bjN7xC0gyetAw== From: "tip-bot2 for Josh Poimboeuf" Sender: tip-bot2@linutronix.de Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: objtool/core] Revert "x86/orc: Make it callthunk aware" Cc: Josh Poimboeuf , x86@kernel.org, linux-kernel@vger.kernel.org In-Reply-To: References: MIME-Version: 1.0 Message-ID: <168629686183.404.12250905754837686812.tip-bot2@tip-bot2> Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The following commit has been merged into the objtool/core branch of tip: Commit-ID: 020126239b8f376ed2f0bef9dc07d0b280a0b7f5 Gitweb: https://git.kernel.org/tip/020126239b8f376ed2f0bef9dc07d0b28= 0a0b7f5 Author: Josh Poimboeuf AuthorDate: Tue, 16 May 2023 06:56:46 -07:00 Committer: Josh Poimboeuf CommitterDate: Wed, 07 Jun 2023 09:48:57 -07:00 Revert "x86/orc: Make it callthunk aware" Commit 396e0b8e09e8 ("x86/orc: Make it callthunk aware") attempted to deal with the fact that function prefix code didn't have ORC coverage. However, it didn't work as advertised. Use of the "null" ORC entry just caused affected unwinds to end early. The root cause has now been fixed with commit 5743654f5e2e ("objtool: Generate ORC data for __pfx code"). Revert most of commit 396e0b8e09e8 ("x86/orc: Make it callthunk aware"). The is_callthunk() function remains as it's now used by other code. Link: https://lore.kernel.org/r/a05b916ef941da872cbece1ab3593eceabd05a79.16= 84245404.git.jpoimboe@kernel.org Signed-off-by: Josh Poimboeuf --- arch/x86/include/asm/alternative.h | 5 ----- arch/x86/kernel/callthunks.c | 2 +- arch/x86/kernel/unwind_orc.c | 21 +-------------------- 3 files changed, 2 insertions(+), 26 deletions(-) diff --git a/arch/x86/include/asm/alternative.h b/arch/x86/include/asm/alte= rnative.h index d7da28f..6c15a62 100644 --- a/arch/x86/include/asm/alternative.h +++ b/arch/x86/include/asm/alternative.h @@ -113,7 +113,6 @@ extern void callthunks_patch_builtin_calls(void); extern void callthunks_patch_module_calls(struct callthunk_sites *sites, struct module *mod); extern void *callthunks_translate_call_dest(void *dest); -extern bool is_callthunk(void *addr); extern int x86_call_depth_emit_accounting(u8 **pprog, void *func); #else static __always_inline void callthunks_patch_builtin_calls(void) {} @@ -124,10 +123,6 @@ static __always_inline void *callthunks_translate_call= _dest(void *dest) { return dest; } -static __always_inline bool is_callthunk(void *addr) -{ - return false; -} static __always_inline int x86_call_depth_emit_accounting(u8 **pprog, void *func) { diff --git a/arch/x86/kernel/callthunks.c b/arch/x86/kernel/callthunks.c index 22ab139..8e0a9b6 100644 --- a/arch/x86/kernel/callthunks.c +++ b/arch/x86/kernel/callthunks.c @@ -293,7 +293,7 @@ void *callthunks_translate_call_dest(void *dest) return target ? : dest; } =20 -bool is_callthunk(void *addr) +static bool is_callthunk(void *addr) { unsigned int tmpl_size =3D SKL_TMPL_SIZE; void *tmpl =3D skl_call_thunk_template; diff --git a/arch/x86/kernel/unwind_orc.c b/arch/x86/kernel/unwind_orc.c index 7891727..4ee16b0 100644 --- a/arch/x86/kernel/unwind_orc.c +++ b/arch/x86/kernel/unwind_orc.c @@ -183,21 +183,6 @@ static struct orc_entry null_orc_entry =3D { .type =3D ORC_TYPE_CALL }; =20 -#ifdef CONFIG_CALL_THUNKS -static struct orc_entry *orc_callthunk_find(unsigned long ip) -{ - if (!is_callthunk((void *)ip)) - return NULL; - - return &null_orc_entry; -} -#else -static struct orc_entry *orc_callthunk_find(unsigned long ip) -{ - return NULL; -} -#endif - /* Fake frame pointer entry -- used as a fallback for generated code */ static struct orc_entry orc_fp_entry =3D { .type =3D ORC_TYPE_CALL, @@ -250,11 +235,7 @@ static struct orc_entry *orc_find(unsigned long ip) if (orc) return orc; =20 - orc =3D orc_ftrace_find(ip); - if (orc) - return orc; - - return orc_callthunk_find(ip); + return orc_ftrace_find(ip); } =20 #ifdef CONFIG_MODULES