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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 00F70C433F5 for ; Tue, 16 Nov 2021 02:23:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DC0F560E0C for ; Tue, 16 Nov 2021 02:23:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234224AbhKPC0a (ORCPT ); Mon, 15 Nov 2021 21:26:30 -0500 Received: from mail.kernel.org ([198.145.29.99]:50840 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232422AbhKORYc (ORCPT ); Mon, 15 Nov 2021 12:24:32 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id F02F661B73; Mon, 15 Nov 2021 17:17:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1636996629; bh=hU45eMtVtBdhqQK2aJ+WCctiySCd3LtO72ZX80TT+KU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZYN8iG7dcIb+S6/o9zBM0pT4yiwaxWXy+VEy8qcsVIVWSFTTnCqPEv1xDtPjJneZa UOv+HkVd0qqVBpBLbrzTr3jCyuRi51ZU6PxbZkeHZJi2CH4SzXoLlPmUwV0K69ZqaZ eVyWIQY//7t7q6UtjA4Fn/iCEDzmQ3VP/6AlQrWQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Sven Schnelle , Helge Deller , Sasha Levin Subject: [PATCH 5.4 176/355] parisc: fix warning in flush_tlb_all Date: Mon, 15 Nov 2021 18:01:40 +0100 Message-Id: <20211115165319.479587755@linuxfoundation.org> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211115165313.549179499@linuxfoundation.org> References: <20211115165313.549179499@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Sven Schnelle [ Upstream commit 1030d681319b43869e0d5b568b9d0226652d1a6f ] I've got the following splat after enabling preemption: [ 3.724721] BUG: using __this_cpu_add() in preemptible [00000000] code: swapper/0/1 [ 3.734630] caller is __this_cpu_preempt_check+0x38/0x50 [ 3.740635] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 5.15.0-rc4-64bit+ #324 [ 3.744605] Hardware name: 9000/785/C8000 [ 3.744605] Backtrace: [ 3.744605] [<00000000401d9d58>] show_stack+0x74/0xb0 [ 3.744605] [<0000000040c27bd4>] dump_stack_lvl+0x10c/0x188 [ 3.744605] [<0000000040c27c84>] dump_stack+0x34/0x48 [ 3.744605] [<0000000040c33438>] check_preemption_disabled+0x178/0x1b0 [ 3.744605] [<0000000040c334f8>] __this_cpu_preempt_check+0x38/0x50 [ 3.744605] [<00000000401d632c>] flush_tlb_all+0x58/0x2e0 [ 3.744605] [<00000000401075c0>] 0x401075c0 [ 3.744605] [<000000004010b8fc>] 0x4010b8fc [ 3.744605] [<00000000401080fc>] 0x401080fc [ 3.744605] [<00000000401d5224>] do_one_initcall+0x128/0x378 [ 3.744605] [<0000000040102de8>] 0x40102de8 [ 3.744605] [<0000000040c33864>] kernel_init+0x60/0x3a8 [ 3.744605] [<00000000401d1020>] ret_from_kernel_thread+0x20/0x28 [ 3.744605] Fix this by moving the __inc_irq_stat() into the locked section. Signed-off-by: Sven Schnelle Signed-off-by: Helge Deller Signed-off-by: Sasha Levin --- arch/parisc/mm/init.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/parisc/mm/init.c b/arch/parisc/mm/init.c index 3e54484797f62..d769d61cde7ca 100644 --- a/arch/parisc/mm/init.c +++ b/arch/parisc/mm/init.c @@ -892,9 +892,9 @@ void flush_tlb_all(void) { int do_recycle; - __inc_irq_stat(irq_tlb_count); do_recycle = 0; spin_lock(&sid_lock); + __inc_irq_stat(irq_tlb_count); if (dirty_space_ids > RECYCLE_THRESHOLD) { BUG_ON(recycle_inuse); /* FIXME: Use a semaphore/wait queue here */ get_dirty_sids(&recycle_ndirty,recycle_dirty_array); @@ -913,8 +913,8 @@ void flush_tlb_all(void) #else void flush_tlb_all(void) { - __inc_irq_stat(irq_tlb_count); spin_lock(&sid_lock); + __inc_irq_stat(irq_tlb_count); flush_tlb_all_local(NULL); recycle_sids(); spin_unlock(&sid_lock); -- 2.33.0