From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:51264 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750861AbdFOH3q (ORCPT ); Thu, 15 Jun 2017 03:29:46 -0400 Subject: Patch "s390/vmem: fix identity mapping" has been added to the 4.4-stable tree To: heiko.carstens@de.ibm.com, gregkh@linuxfoundation.org, jdelvare@suse.de, schwidefsky@de.ibm.com Cc: , From: Date: Thu, 15 Jun 2017 09:29:32 +0200 Message-ID: <149751177220952@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled s390/vmem: fix identity mapping to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: s390-vmem-fix-identity-mapping.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From c34a69059d7876e0793eb410deedfb08ccb22b02 Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Tue, 10 May 2016 12:10:22 +0200 Subject: s390/vmem: fix identity mapping From: Heiko Carstens commit c34a69059d7876e0793eb410deedfb08ccb22b02 upstream. The identity mapping is suboptimal for the last 2GB frame. The mapping will be established with a mix of 4KB and 1MB mappings instead of a single 2GB mapping. This happens because of a off-by-one bug introduced with commit 50be63450728 ("s390/mm: Convert bootmem to memblock"). Currently the identity mapping looks like this: 0x0000000080000000-0x0000000180000000 4G PUD RW 0x0000000180000000-0x00000001fff00000 2047M PMD RW 0x00000001fff00000-0x0000000200000000 1M PTE RW With the bug fixed it looks like this: 0x0000000080000000-0x0000000200000000 6G PUD RW Fixes: 50be63450728 ("s390/mm: Convert bootmem to memblock") Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky Cc: Jean Delvare Signed-off-by: Greg Kroah-Hartman --- arch/s390/mm/vmem.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/s390/mm/vmem.c +++ b/arch/s390/mm/vmem.c @@ -372,7 +372,7 @@ void __init vmem_map_init(void) ro_end = (unsigned long)&_eshared & PAGE_MASK; for_each_memblock(memory, reg) { start = reg->base; - end = reg->base + reg->size - 1; + end = reg->base + reg->size; if (start >= ro_end || end <= ro_start) vmem_add_mem(start, end - start, 0); else if (start >= ro_start && end <= ro_end) Patches currently in stable-queue which might be from heiko.carstens@de.ibm.com are queue-4.4/s390-vmem-fix-identity-mapping.patch