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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6A608C19F28 for ; Wed, 27 Jul 2022 17:20:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240127AbiG0RUA (ORCPT ); Wed, 27 Jul 2022 13:20:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33462 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240113AbiG0RSX (ORCPT ); Wed, 27 Jul 2022 13:18:23 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 26D795C9C3; Wed, 27 Jul 2022 09:43:48 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id BCBE7B8200C; Wed, 27 Jul 2022 16:43:46 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2CF11C433C1; Wed, 27 Jul 2022 16:43:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1658940225; bh=fQbnzm2Dq9Za4ZflIcr2EXIrw0q4yIR4IjS0LUqj6cU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JvL7+CEQ+TkQlw9ljrObHvmbq/XD9aLIP7ycTmD+OJCv30JZdAJCP+U9Nip17/940 hJD0+x9jxGW/cScFLMCsoeGTDT67F5yLnc1S147e2rCRgR1UYP7PQSlTod9AGq7Iva 1W/EiipzEjI28JKfdntvgs7RkEFZ5J7SIAsX/A7Q= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "Peter Zijlstra (Intel)" , Josh Poimboeuf , Sasha Levin Subject: [PATCH 5.15 150/201] x86/futex: Remove .fixup usage Date: Wed, 27 Jul 2022 18:10:54 +0200 Message-Id: <20220727161034.050152608@linuxfoundation.org> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20220727161026.977588183@linuxfoundation.org> References: <20220727161026.977588183@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Peter Zijlstra [ Upstream commit 4c132d1d844a53fc4e4b5c34e36ef10d6124b783 ] Use the new EX_TYPE_IMM_REG to store -EFAULT into the designated 'ret' register, this removes the need for anonymous .fixup code. Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Josh Poimboeuf Link: https://lore.kernel.org/r/20211110101325.426016322@infradead.org Signed-off-by: Sasha Levin --- arch/x86/include/asm/extable_fixup_types.h | 2 ++ arch/x86/include/asm/futex.h | 28 +++++++--------------- 2 files changed, 10 insertions(+), 20 deletions(-) diff --git a/arch/x86/include/asm/extable_fixup_types.h b/arch/x86/include/asm/extable_fixup_types.h index 9d597fe1017d..7469038de100 100644 --- a/arch/x86/include/asm/extable_fixup_types.h +++ b/arch/x86/include/asm/extable_fixup_types.h @@ -42,6 +42,8 @@ #define EX_TYPE_DEFAULT_MCE_SAFE 14 #define EX_TYPE_FAULT_MCE_SAFE 15 #define EX_TYPE_POP_ZERO 16 + #define EX_TYPE_IMM_REG 17 /* reg := (long)imm */ +#define EX_TYPE_EFAULT_REG (EX_TYPE_IMM_REG | EX_DATA_IMM(-EFAULT)) #endif diff --git a/arch/x86/include/asm/futex.h b/arch/x86/include/asm/futex.h index f9c00110a69a..99d345b686fa 100644 --- a/arch/x86/include/asm/futex.h +++ b/arch/x86/include/asm/futex.h @@ -17,13 +17,9 @@ do { \ int oldval = 0, ret; \ asm volatile("1:\t" insn "\n" \ "2:\n" \ - "\t.section .fixup,\"ax\"\n" \ - "3:\tmov\t%3, %1\n" \ - "\tjmp\t2b\n" \ - "\t.previous\n" \ - _ASM_EXTABLE_UA(1b, 3b) \ + _ASM_EXTABLE_TYPE_REG(1b, 2b, EX_TYPE_EFAULT_REG, %1) \ : "=r" (oldval), "=r" (ret), "+m" (*uaddr) \ - : "i" (-EFAULT), "0" (oparg), "1" (0)); \ + : "0" (oparg), "1" (0)); \ if (ret) \ goto label; \ *oval = oldval; \ @@ -39,15 +35,11 @@ do { \ "3:\t" LOCK_PREFIX "cmpxchgl %3, %2\n" \ "\tjnz\t2b\n" \ "4:\n" \ - "\t.section .fixup,\"ax\"\n" \ - "5:\tmov\t%5, %1\n" \ - "\tjmp\t4b\n" \ - "\t.previous\n" \ - _ASM_EXTABLE_UA(1b, 5b) \ - _ASM_EXTABLE_UA(3b, 5b) \ + _ASM_EXTABLE_TYPE_REG(1b, 4b, EX_TYPE_EFAULT_REG, %1) \ + _ASM_EXTABLE_TYPE_REG(3b, 4b, EX_TYPE_EFAULT_REG, %1) \ : "=&a" (oldval), "=&r" (ret), \ "+m" (*uaddr), "=&r" (tem) \ - : "r" (oparg), "i" (-EFAULT), "1" (0)); \ + : "r" (oparg), "1" (0)); \ if (ret) \ goto label; \ *oval = oldval; \ @@ -95,15 +87,11 @@ static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, if (!user_access_begin(uaddr, sizeof(u32))) return -EFAULT; asm volatile("\n" - "1:\t" LOCK_PREFIX "cmpxchgl %4, %2\n" + "1:\t" LOCK_PREFIX "cmpxchgl %3, %2\n" "2:\n" - "\t.section .fixup, \"ax\"\n" - "3:\tmov %3, %0\n" - "\tjmp 2b\n" - "\t.previous\n" - _ASM_EXTABLE_UA(1b, 3b) + _ASM_EXTABLE_TYPE_REG(1b, 2b, EX_TYPE_EFAULT_REG, %0) \ : "+r" (ret), "=a" (oldval), "+m" (*uaddr) - : "i" (-EFAULT), "r" (newval), "1" (oldval) + : "r" (newval), "1" (oldval) : "memory" ); user_access_end(); -- 2.35.1