From patchwork Thu Apr 25 09:45:02 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 10916681 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7D00214DB for ; Thu, 25 Apr 2019 10:01:13 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6DA0828A08 for ; Thu, 25 Apr 2019 10:01:13 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6000028C50; Thu, 25 Apr 2019 10:01:13 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0689228A08 for ; Thu, 25 Apr 2019 10:01:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730006AbfDYKBD (ORCPT ); Thu, 25 Apr 2019 06:01:03 -0400 Received: from Galois.linutronix.de ([146.0.238.70]:58112 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728554AbfDYKBB (ORCPT ); Thu, 25 Apr 2019 06:01:01 -0400 Received: from localhost ([127.0.0.1] helo=nanos.tec.linutronix.de) by Galois.linutronix.de with esmtp (Exim 4.80) (envelope-from ) id 1hJb9v-0001rW-1P; Thu, 25 Apr 2019 11:59:15 +0200 Message-Id: <20190425094801.963261479@linutronix.de> User-Agent: quilt/0.65 Date: Thu, 25 Apr 2019 11:45:02 +0200 From: Thomas Gleixner To: LKML Cc: Josh Poimboeuf , x86@kernel.org, Andy Lutomirski , Dmitry Vyukov , Andrey Ryabinin , Alexander Potapenko , kasan-dev@googlegroups.com, linux-mm@kvack.org, Steven Rostedt , Alexey Dobriyan , Andrew Morton , Christoph Lameter , Pekka Enberg , David Rientjes , Catalin Marinas , Mike Rapoport , Akinobu Mita , Christoph Hellwig , iommu@lists.linux-foundation.org, Robin Murphy , Marek Szyprowski , Johannes Thumshirn , David Sterba , Chris Mason , Josef Bacik , linux-btrfs@vger.kernel.org, dm-devel@redhat.com, Mike Snitzer , Alasdair Kergon , Daniel Vetter , intel-gfx@lists.freedesktop.org, Joonas Lahtinen , Maarten Lankhorst , dri-devel@lists.freedesktop.org, David Airlie , Jani Nikula , Rodrigo Vivi , Tom Zanussi , Miroslav Benes , linux-arch@vger.kernel.org Subject: [patch V3 09/29] mm/kasan: Simplify stacktrace handling References: <20190425094453.875139013@linutronix.de> MIME-Version: 1.0 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Replace the indirection through struct stack_trace by using the storage array based interfaces. Signed-off-by: Thomas Gleixner Acked-by: Dmitry Vyukov Acked-by: Andrey Ryabinin Cc: Alexander Potapenko Cc: kasan-dev@googlegroups.com Cc: linux-mm@kvack.org --- mm/kasan/common.c | 30 ++++++++++++------------------ mm/kasan/report.c | 7 ++++--- 2 files changed, 16 insertions(+), 21 deletions(-) --- a/mm/kasan/common.c +++ b/mm/kasan/common.c @@ -48,34 +48,28 @@ static inline int in_irqentry_text(unsig ptr < (unsigned long)&__softirqentry_text_end); } -static inline void filter_irq_stacks(struct stack_trace *trace) +static inline unsigned int filter_irq_stacks(unsigned long *entries, + unsigned int nr_entries) { - int i; + unsigned int i; - if (!trace->nr_entries) - return; - for (i = 0; i < trace->nr_entries; i++) - if (in_irqentry_text(trace->entries[i])) { + for (i = 0; i < nr_entries; i++) { + if (in_irqentry_text(entries[i])) { /* Include the irqentry function into the stack. */ - trace->nr_entries = i + 1; - break; + return i + 1; } + } + return nr_entries; } static inline depot_stack_handle_t save_stack(gfp_t flags) { unsigned long entries[KASAN_STACK_DEPTH]; - struct stack_trace trace = { - .nr_entries = 0, - .entries = entries, - .max_entries = KASAN_STACK_DEPTH, - .skip = 0 - }; + unsigned int nr_entries; - save_stack_trace(&trace); - filter_irq_stacks(&trace); - - return depot_save_stack(&trace, flags); + nr_entries = stack_trace_save(entries, ARRAY_SIZE(entries), 0); + nr_entries = filter_irq_stacks(entries, nr_entries); + return stack_depot_save(entries, nr_entries, flags); } static inline void set_track(struct kasan_track *track, gfp_t flags) --- a/mm/kasan/report.c +++ b/mm/kasan/report.c @@ -100,10 +100,11 @@ static void print_track(struct kasan_tra { pr_err("%s by task %u:\n", prefix, track->pid); if (track->stack) { - struct stack_trace trace; + unsigned long *entries; + unsigned int nr_entries; - depot_fetch_stack(track->stack, &trace); - print_stack_trace(&trace, 0); + nr_entries = stack_depot_fetch(track->stack, &entries); + stack_trace_print(entries, nr_entries, 0); } else { pr_err("(stack is not available)\n"); }