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=-8.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=ham 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 16808C35250 for ; Sat, 8 Feb 2020 12:50:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E3E042082E for ; Sat, 8 Feb 2020 12:50:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727303AbgBHMuJ (ORCPT ); Sat, 8 Feb 2020 07:50:09 -0500 Received: from ozlabs.org ([203.11.71.1]:51285 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727118AbgBHMuI (ORCPT ); Sat, 8 Feb 2020 07:50:08 -0500 Received: by ozlabs.org (Postfix, from userid 1034) id 48FBpP4qWsz9sRY; Sat, 8 Feb 2020 23:50:05 +1100 (AEDT) X-powerpc-patch-notification: thanks X-powerpc-patch-commit: d4bf905307a1c90a27714ff7a9fd29b0a2ceed98 In-Reply-To: To: Christophe Leroy , Benjamin Herrenschmidt , Paul Mackerras , Guenter Roeck From: Michael Ellerman Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] powerpc: Fix CONFIG_TRACE_IRQFLAGS with CONFIG_VMAP_STACK Message-Id: <48FBpP4qWsz9sRY@ozlabs.org> Date: Sat, 8 Feb 2020 23:50:05 +1100 (AEDT) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2020-02-07 at 17:20:57 UTC, Christophe Leroy wrote: > When CONFIG_PROVE_LOCKING is selected together with (now default) > CONFIG_VMAP_STACK, kernel enter deadlock during boot. > > At the point of checking whether interrupts are enabled or not, the > value of MSR saved on stack is read using the physical address of the > stack. But at this point, when using VMAP stack the DATA MMU > translation has already been re-enabled, leading to deadlock. > > Don't use the physical address of the stack when > CONFIG_VMAP_STACK is set. > > Signed-off-by: Christophe Leroy > Reported-by: Guenter Roeck > Fixes: 028474876f47 ("powerpc/32: prepare for CONFIG_VMAP_STACK") Applied to powerpc fixes, thanks. https://git.kernel.org/powerpc/c/d4bf905307a1c90a27714ff7a9fd29b0a2ceed98 cheers