From nobody Wed Dec 17 14:21:47 2025 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 345E6EE49AC for ; Mon, 21 Aug 2023 12:31:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232916AbjHUMbg (ORCPT ); Mon, 21 Aug 2023 08:31:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40960 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234921AbjHUMb2 (ORCPT ); Mon, 21 Aug 2023 08:31:28 -0400 Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6626EFA; Mon, 21 Aug 2023 05:31:25 -0700 (PDT) Received: from dggpemm100001.china.huawei.com (unknown [172.30.72.55]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4RTsGs73pWzVks8; Mon, 21 Aug 2023 20:29:09 +0800 (CST) Received: from localhost.localdomain (10.175.112.125) by dggpemm100001.china.huawei.com (7.185.36.93) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.31; Mon, 21 Aug 2023 20:31:21 +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 , , "H . Peter Anvin" , , , , , , , Kefeng Wang Subject: [PATCH rfc v2 08/10] loongarch: mm: cleanup __do_page_fault() Date: Mon, 21 Aug 2023 20:30:54 +0800 Message-ID: <20230821123056.2109942-9-wangkefeng.wang@huawei.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20230821123056.2109942-1-wangkefeng.wang@huawei.com> References: <20230821123056.2109942-1-wangkefeng.wang@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.175.112.125] X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To dggpemm100001.china.huawei.com (7.185.36.93) 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 | 48 +++++++++++++-------------------------- 1 file changed, 16 insertions(+), 32 deletions(-) diff --git a/arch/loongarch/mm/fault.c b/arch/loongarch/mm/fault.c index e6376e3dce86..5d4c742c4bc5 100644 --- a/arch/loongarch/mm/fault.c +++ b/arch/loongarch/mm/fault.c @@ -157,18 +157,15 @@ static void __kprobes __do_page_fault(struct pt_regs = *regs, if (!user_mode(regs)) no_context(regs, write, 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; @@ -178,23 +175,7 @@ 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) { @@ -235,22 +216,25 @@ 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) { + if (fault & VM_FAULT_OOM) do_out_of_memory(regs, write, address); - return; - } else if (fault & VM_FAULT_SIGSEGV) { - do_sigsegv(regs, write, address, si_code); - return; - } else if (fault & (VM_FAULT_SIGBUS|VM_FAULT_HWPOISON|VM_FAULT_HWPOISON_= LARGE)) { + else if (fault & VM_FAULT_SIGSEGV) + goto bad_area_nosemaphore; + else if (fault & (VM_FAULT_SIGBUS|VM_FAULT_HWPOISON|VM_FAULT_HWPOISON_LA= RGE)) do_sigbus(regs, write, address, si_code); - return; - } - BUG(); + else + 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