From patchwork Thu Jul 13 09:53:36 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kefeng Wang X-Patchwork-Id: 13311683 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 22522C0015E for ; Thu, 13 Jul 2023 09:40:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=ZNsoHbSz7sDT44r632VXPuZkIkJDr2/0vvf5JtaG610=; b=nh+V4q3YVH+6oO 4xR4Vq9VShQP9MBHb3XTYYKMP8fJB1XvymKfpNV4XTbCFI1fE3WCkHeAoBhFy8tBiZ+mVX3fwhpxb v9OjZunofgiA+3XmXTC8SMAnMl1GuBF6Oci0PN2fjfJ4btOzbq8b4tblVJs0NYyK9yMRESBt0CVhE Oxy0cBhXi+7GDKTSaosok9ruj2E4JfEK3ruJBafY6OZq4wh6FM96OvfhsuuqIRhrbnfKAqAcUW+dl Rqvkrs/UnUWfBLKXrtPdfB2DpDcg+bVgwEErmmaLZ/gIoZ8TYgX3onRAsbIC18b2jmtaoFbsDwrhO senv1AgwGnHhGsXlaCGg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qJsoV-002eHn-1s; Thu, 13 Jul 2023 09:40:43 +0000 Received: from szxga08-in.huawei.com ([45.249.212.255]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qJsoM-002e6Y-0m; Thu, 13 Jul 2023 09:40:36 +0000 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 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230713_024034_689041_111577F7 X-CRM114-Status: GOOD ( 12.79 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org 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; } /* * 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; if (user_mode(regs)) flags |= FAULT_FLAG_USER; @@ -172,23 +169,7 @@ static void __kprobes __do_page_fault(struct pt_regs *regs, vma = 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; -/* - * Ok, we have a good vm_area for this memory access, so - * we can handle it.. - */ -good_area: si_code = SEGV_ACCERR; 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(); } + return; +bad_area: mmap_read_unlock(mm); +bad_area_nosemaphore: + do_sigsegv(regs, write, address, si_code); } asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,