From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754876AbbBOJd4 (ORCPT ); Sun, 15 Feb 2015 04:33:56 -0500 Received: from szxga02-in.huawei.com ([119.145.14.65]:54447 "EHLO szxga02-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754749AbbBOJdg (ORCPT ); Sun, 15 Feb 2015 04:33:36 -0500 From: Yun Wu To: , , CC: , , Yun Wu Subject: [PATCH v2 3/6] irqchip: gicv3-its: limit order of DT size to MAX_ORDER Date: Sun, 15 Feb 2015 17:32:00 +0800 Message-ID: <1423992723-5028-4-git-send-email-wuyun.wu@huawei.com> X-Mailer: git-send-email 1.9.4.msysgit.1 In-Reply-To: <1423992723-5028-1-git-send-email-wuyun.wu@huawei.com> References: <1423992723-5028-1-git-send-email-wuyun.wu@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.177.24.136] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When required DT size is out of the kmalloc()'s capability, the whole ITS will fail in probing. This actually is not the hardware's problem and is mainly a limitation of the kernel memory allocator. This patch will keep ITS going on to the next initializaion step with an explicit warning. Signed-off-by: Yun Wu --- drivers/irqchip/irq-gic-v3-its.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index f5bfa42..de36606 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -828,6 +828,12 @@ static int its_alloc_tables(struct its_node *its) u32 ids = GITS_TYPER_DEVBITS(typer); order = get_order((1UL << ids) * entry_size); + if (order >= MAX_ORDER) { + pr_warn("%s: DT size too large, reduce to %u pages\n", + its->msi_chip.of_node->full_name, + 1 << order); + order = MAX_ORDER; + } } alloc_size = (1 << order) * PAGE_SIZE; -- 1.8.0