From nobody Tue Feb 10 04:12:28 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 7A752EB64DD for ; Thu, 13 Jul 2023 09:41:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234420AbjGMJlJ (ORCPT ); Thu, 13 Jul 2023 05:41:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58888 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234250AbjGMJkk (ORCPT ); Thu, 13 Jul 2023 05:40:40 -0400 Received: from szxga08-in.huawei.com (szxga08-in.huawei.com [45.249.212.255]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 789A52127; Thu, 13 Jul 2023 02:40:34 -0700 (PDT) Received: from dggpemm500001.china.huawei.com (unknown [172.30.72.56]) by szxga08-in.huawei.com (SkyGuard) with ESMTP id 4R1qMc4wfvz18Lt7; Thu, 13 Jul 2023 17:39:56 +0800 (CST) Received: from localhost.localdomain.localdomain (10.175.113.25) by dggpemm500001.china.huawei.com (7.185.36.107) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.27; Thu, 13 Jul 2023 17:40:31 +0800 From: Kefeng Wang To: , Andrew Morton , CC: Russell King , Catalin Marinas , Will Deacon , Huacai Chen , WANG Xuerui , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexander Gordeev , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Sven Schnelle , Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , , , , , , , , Kefeng Wang Subject: [PATCH rfc -next 08/10] loongarch: mm: cleanup __do_page_fault() Date: Thu, 13 Jul 2023 17:53:36 +0800 Message-ID: <20230713095339.189715-9-wangkefeng.wang@huawei.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230713095339.189715-1-wangkefeng.wang@huawei.com> References: <20230713095339.189715-1-wangkefeng.wang@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.175.113.25] X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To dggpemm500001.china.huawei.com (7.185.36.107) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Cleanup __do_page_fault() by reuse bad_area_nosemaphore and bad_area label. Signed-off-by: Kefeng Wang --- arch/loongarch/mm/fault.c | 36 +++++++++++------------------------- 1 file changed, 11 insertions(+), 25 deletions(-) diff --git a/arch/loongarch/mm/fault.c b/arch/loongarch/mm/fault.c index da5b6d518cdb..03d06ee184da 100644 --- a/arch/loongarch/mm/fault.c +++ b/arch/loongarch/mm/fault.c @@ -151,18 +151,15 @@ static void __kprobes __do_page_fault(struct pt_regs = *regs, if (!user_mode(regs)) no_context(regs, address); else - do_sigsegv(regs, write, address, si_code); - return; + goto bad_area_nosemaphore; } =20 /* * If we're in an interrupt or have no user * context, we must not take the fault.. */ - if (faulthandler_disabled() || !mm) { - do_sigsegv(regs, write, address, si_code); - return; - } + if (faulthandler_disabled() || !mm) + goto bad_area_nosemaphore; =20 if (user_mode(regs)) flags |=3D FAULT_FLAG_USER; @@ -172,23 +169,7 @@ static void __kprobes __do_page_fault(struct pt_regs *= regs, vma =3D lock_mm_and_find_vma(mm, address, regs); if (unlikely(!vma)) goto bad_area_nosemaphore; - goto good_area; - -/* - * Something tried to access memory that isn't in our memory map.. - * Fix it, but check if it's kernel or user first.. - */ -bad_area: - mmap_read_unlock(mm); -bad_area_nosemaphore: - do_sigsegv(regs, write, address, si_code); - return; =20 -/* - * Ok, we have a good vm_area for this memory access, so - * we can handle it.. - */ -good_area: si_code =3D SEGV_ACCERR; =20 if (write) { @@ -229,14 +210,15 @@ static void __kprobes __do_page_fault(struct pt_regs = *regs, */ goto retry; } + + mmap_read_unlock(mm); + if (unlikely(fault & VM_FAULT_ERROR)) { - mmap_read_unlock(mm); if (fault & VM_FAULT_OOM) { do_out_of_memory(regs, address); return; } else if (fault & VM_FAULT_SIGSEGV) { - do_sigsegv(regs, write, address, si_code); - return; + goto bad_area_nosemaphore; } else if (fault & (VM_FAULT_SIGBUS|VM_FAULT_HWPOISON|VM_FAULT_HWPOISON_= LARGE)) { do_sigbus(regs, write, address, si_code); return; @@ -244,7 +226,11 @@ static void __kprobes __do_page_fault(struct pt_regs *= regs, BUG(); } =20 + return; +bad_area: mmap_read_unlock(mm); +bad_area_nosemaphore: + do_sigsegv(regs, write, address, si_code); } =20 asmlinkage void __kprobes do_page_fault(struct pt_regs *regs, --=20 2.27.0