From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933038AbcAKN3n (ORCPT ); Mon, 11 Jan 2016 08:29:43 -0500 Received: from mail-wm0-f48.google.com ([74.125.82.48]:35671 "EHLO mail-wm0-f48.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759671AbcAKNTi (ORCPT ); Mon, 11 Jan 2016 08:19:38 -0500 From: Ard Biesheuvel To: linux-arm-kernel@lists.infradead.org, kernel-hardening@lists.openwall.com, will.deacon@arm.com, catalin.marinas@arm.com, mark.rutland@arm.com, leif.lindholm@linaro.org, keescook@chromium.org, linux-kernel@vger.kernel.org Cc: stuart.yoder@freescale.com, bhupesh.sharma@freescale.com, arnd@arndb.de, marc.zyngier@arm.com, christoffer.dall@linaro.org, Ard Biesheuvel Subject: [PATCH v3 01/21] of/fdt: make memblock minimum physical address arch configurable Date: Mon, 11 Jan 2016 14:18:54 +0100 Message-Id: <1452518355-4606-2-git-send-email-ard.biesheuvel@linaro.org> X-Mailer: git-send-email 2.5.0 In-Reply-To: <1452518355-4606-1-git-send-email-ard.biesheuvel@linaro.org> References: <1452518355-4606-1-git-send-email-ard.biesheuvel@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org By default, early_init_dt_add_memory_arch() ignores memory below the base of the kernel image since it won't be addressable via the linear mapping. However, this is not appropriate anymore once we decouple the kernel text mapping from the linear mapping, so archs may want to drop the low limit entirely. So allow the minimum to be overridden by setting MIN_MEMBLOCK_ADDR. Acked-by: Mark Rutland Acked-by: Rob Herring Signed-off-by: Ard Biesheuvel --- drivers/of/fdt.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index d2430298a309..0455564f8cbc 100644 --- a/drivers/of/fdt.c +++ b/drivers/of/fdt.c @@ -971,13 +971,16 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname, } #ifdef CONFIG_HAVE_MEMBLOCK +#ifndef MIN_MEMBLOCK_ADDR +#define MIN_MEMBLOCK_ADDR __pa(PAGE_OFFSET) +#endif #ifndef MAX_MEMBLOCK_ADDR #define MAX_MEMBLOCK_ADDR ((phys_addr_t)~0) #endif void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size) { - const u64 phys_offset = __pa(PAGE_OFFSET); + const u64 phys_offset = MIN_MEMBLOCK_ADDR; if (!PAGE_ALIGNED(base)) { if (size < PAGE_SIZE - (base & ~PAGE_MASK)) { -- 2.5.0