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 X-Spam-Level: X-Spam-Status: No, score=-5.3 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_MUTT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6E982C282CE for ; Tue, 4 Jun 2019 06:55:52 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 9FF1124DB4 for ; Tue, 4 Jun 2019 06:55:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="HARn4yCl" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9FF1124DB4 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 45J2kY2VhDzDqQZ for ; Tue, 4 Jun 2019 16:55:49 +1000 (AEST) Authentication-Results: lists.ozlabs.org; spf=none (mailfrom) smtp.mailfrom=infradead.org (client-ip=2607:7c80:54:e::133; helo=bombadil.infradead.org; envelope-from=peterz@infradead.org; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=infradead.org header.i=@infradead.org header.b="HARn4yCl"; dkim-atps=neutral Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 45J2hp6LsSzDqQ9 for ; Tue, 4 Jun 2019 16:54:18 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=o0/x+1oKv0SZnOXYtDRUsgML6+umJV3GQkxVLH8VplA=; b=HARn4yClLyKIcGgcTwTDD+jMd 1ef7NULcX2Ny2MFe3bZpZHb30cLWSrPWc+xLr8ShYTmRRwEt49WdLKzvXVE7+BLps/iqR4Kkhg4+D Jv5IlCPj9JeZ/4Zj90FKMkkfDVWaeU3eqEvefbikGR7rzaj7QViz1N46SKGNWu7zI4W3PoR20bU0u bPCRXeOfyT/1kv9ZkyME/bMQcBf1vGP9Zo0EO4Dgrn0hnw+ygmh+mzIgTUlc9k3aSnSRuQDc5mgfz 1Hk0TIi/arJ70lLgpQO+eOM7NwXLFKSxYHf4sA/TaUDXS1/nqt5n66d+x7GKHDaCKsR0BqTZraZkJ 0Wa5VbknA==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=hirez.programming.kicks-ass.net) by bombadil.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1hY3Ke-0001TW-0y; Tue, 04 Jun 2019 06:54:04 +0000 Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 9627520761B5F; Tue, 4 Jun 2019 08:54:01 +0200 (CEST) Date: Tue, 4 Jun 2019 08:54:01 +0200 From: Peter Zijlstra To: Anshuman Khandual Subject: Re: [RFC V2] mm: Generalize notify_page_fault() Message-ID: <20190604065401.GE3402@hirez.programming.kicks-ass.net> References: <1559630046-12940-1-git-send-email-anshuman.khandual@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1559630046-12940-1-git-send-email-anshuman.khandual@arm.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Michal Hocko , linux-ia64@vger.kernel.org, linux-sh@vger.kernel.org, Catalin Marinas , Dave Hansen , Will Deacon , linux-mm@kvack.org, Paul Mackerras , sparclinux@vger.kernel.org, linux-s390@vger.kernel.org, Yoshinori Sato , x86@kernel.org, Russell King , Matthew Wilcox , Ingo Molnar , Fenghua Yu , Stephen Rothwell , Andrey Konovalov , Andy Lutomirski , Thomas Gleixner , linux-arm-kernel@lists.infradead.org, Tony Luck , Heiko Carstens , linux-kernel@vger.kernel.org, Martin Schwidefsky , Andrew Morton , linuxppc-dev@lists.ozlabs.org, "David S. Miller" Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Tue, Jun 04, 2019 at 12:04:06PM +0530, Anshuman Khandual wrote: > diff --git a/mm/memory.c b/mm/memory.c > index ddf20bd..b6bae8f 100644 > --- a/mm/memory.c > +++ b/mm/memory.c > @@ -52,6 +52,7 @@ > #include > #include > #include > +#include > #include > #include > #include > @@ -141,6 +142,21 @@ static int __init init_zero_pfn(void) > core_initcall(init_zero_pfn); > > > +int __kprobes notify_page_fault(struct pt_regs *regs, unsigned int trap) > +{ > + int ret = 0; > + > + /* > + * To be potentially processing a kprobe fault and to be allowed > + * to call kprobe_running(), we have to be non-preemptible. > + */ > + if (kprobes_built_in() && !preemptible() && !user_mode(regs)) { > + if (kprobe_running() && kprobe_fault_handler(regs, trap)) > + ret = 1; > + } > + return ret; > +} That thing should be called kprobe_page_fault() or something, notify_page_fault() is a horribly crap name for this function.