From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754387AbcKRNFl (ORCPT ); Fri, 18 Nov 2016 08:05:41 -0500 Received: from bombadil.infradead.org ([198.137.202.9]:54864 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754180AbcKRNEY (ORCPT ); Fri, 18 Nov 2016 08:04:24 -0500 From: Christoph Hellwig To: akpm@linux-foundation.org Cc: aryabinin@virtuozzo.com, joelaf@google.com, jszhang@marvell.com, chris@chris-wilson.co.uk, joaodias@google.com, linux-mm@kvack.org, linux-rt-users@vger.kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 06/10] x86/ldt: use vfree_atomic() to free ldt entries Date: Fri, 18 Nov 2016 14:03:52 +0100 Message-Id: <1479474236-4139-7-git-send-email-hch@lst.de> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1479474236-4139-1-git-send-email-hch@lst.de> References: <1479474236-4139-1-git-send-email-hch@lst.de> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Andrey Ryabinin vfree() is going to use sleeping lock. free_ldt_struct() may be called with disabled preemption, therefore we must use vfree_atomic() here. E.g. call trace: vfree() free_ldt_struct() destroy_context_ldt() __mmdrop() finish_task_switch() schedule_tail() ret_from_fork() Signed-off-by: Andrey Ryabinin --- arch/x86/kernel/ldt.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kernel/ldt.c b/arch/x86/kernel/ldt.c index 6707039..4d12cdf 100644 --- a/arch/x86/kernel/ldt.c +++ b/arch/x86/kernel/ldt.c @@ -93,7 +93,7 @@ static void free_ldt_struct(struct ldt_struct *ldt) paravirt_free_ldt(ldt->entries, ldt->size); if (ldt->size * LDT_ENTRY_SIZE > PAGE_SIZE) - vfree(ldt->entries); + vfree_atomic(ldt->entries); else free_page((unsigned long)ldt->entries); kfree(ldt); -- 2.1.4