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=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 8F799C35250 for ; Sat, 8 Feb 2020 12:57:44 +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 1743220726 for ; Sat, 8 Feb 2020 12:57:44 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1743220726 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ellerman.id.au 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 48FBz9316KzDqCh for ; Sat, 8 Feb 2020 23:57:41 +1100 (AEDT) Received: from ozlabs.org (bilbo.ozlabs.org [IPv6:2401:3900:2:1::2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 48FBpR0L1GzDqM3 for ; Sat, 8 Feb 2020 23:50:07 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=ellerman.id.au 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 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) 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: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" 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