Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752116AbbKOLoI (ORCPT ); Sun, 15 Nov 2015 06:44:08 -0500 Received: from xavier.telenet-ops.be ([195.130.132.52]:46791 "EHLO xavier.telenet-ops.be" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751651AbbKOLnQ (ORCPT ); Sun, 15 Nov 2015 06:43:16 -0500 From: Geert Uytterhoeven To: Greg Ungerer , Sam Creasey , linux-m68k@vger.kernel.org Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, Geert Uytterhoeven Subject: [PATCH 0/4] m68k/mm: Add missing initialization of max_pfn and {min,max}_low_pfn Date: Sun, 15 Nov 2015 12:04:11 +0100 Message-Id: <1447585455-19671-1-git-send-email-geert@linux-m68k.org> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1999 Lines: 59 Hi, This patch series adds missing initialization of max_pfn, min_low_pfn, and max_low_pfn on various m68k platforms. This was exposed by failing selftests/vm/mlock2-tests. Note that several other architectures lack a proper initialization of max_pfn. On some of them it's completely missing, on others max_pfn is a local variable, hence it hides the global max_pfn, which is thus not initialized neither. On platforms with MMU, this can easily be verified by reading the following virtual files (CONFIG_PROC_PAGE_MONITOR=y): /proc/kpagecount /proc/kpageflags /proc/kpagecgroup (CONFIG_MEMCG=y) If max_pfn is not initialized, all three virtual files are empty. Besides the above, max_pfn is also used to calculate DMA masks for block devices. An uninitialized (zero) value means all RAM is suitable for DMA. Absence of initialization of min_low_pfn and max_low_pfn is more subtle. (are there any bad side-effects?). Geert Uytterhoeven (4): m68k/mm: motorola - Add missing initialization of max_pfn m68k/mm: m54xx - Add missing initialization of max_pfn m68k/mm: sun3 - Add missing initialization of max_pfn and {min,max}_low_pfn m68knommu: Add missing initialization of max_pfn and {min,max}_low_pfn arch/m68k/coldfire/m54xx.c | 2 +- arch/m68k/kernel/setup_no.c | 9 ++++++--- arch/m68k/mm/motorola.c | 2 +- arch/m68k/sun3/config.c | 4 ++-- 4 files changed, 10 insertions(+), 7 deletions(-) -- 1.9.1 Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/