From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:43310 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751771AbeBBKnx (ORCPT ); Fri, 2 Feb 2018 05:43:53 -0500 Subject: Patch "android: binder: use VM_ALLOC to get vm area" has been added to the 4.15-stable tree To: opensource.ganesh@gmail.com, gregkh@linuxfoundation.org, maco@android.com, tkjos@google.com Cc: , From: Date: Fri, 02 Feb 2018 11:43:39 +0100 Message-ID: <15175682194918@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 android: binder: use VM_ALLOC to get vm area to the 4.15-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: android-binder-use-vm_alloc-to-get-vm-area.patch and it can be found in the queue-4.15 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From aac6830ec1cb681544212838911cdc57f2638216 Mon Sep 17 00:00:00 2001 From: Ganesh Mahendran Date: Wed, 10 Jan 2018 10:49:05 +0800 Subject: android: binder: use VM_ALLOC to get vm area From: Ganesh Mahendran commit aac6830ec1cb681544212838911cdc57f2638216 upstream. VM_IOREMAP is used to access hardware through a mechanism called I/O mapped memory. Android binder is a IPC machanism which will not access I/O memory. And VM_IOREMAP has alignment requiement which may not needed in binder. __get_vm_area_node() { ... if (flags & VM_IOREMAP) align = 1ul << clamp_t(int, fls_long(size), PAGE_SHIFT, IOREMAP_MAX_ORDER); ... } This patch will save some kernel vm area, especially for 32bit os. In 32bit OS, kernel vm area is only 240MB. We may got below error when launching a app: <3>[ 4482.440053] binder_alloc: binder_alloc_mmap_handler: 15728 8ce67000-8cf65000 get_vm_area failed -12 <3>[ 4483.218817] binder_alloc: binder_alloc_mmap_handler: 15745 8ce67000-8cf65000 get_vm_area failed -12 Signed-off-by: Ganesh Mahendran Acked-by: Martijn Coenen Acked-by: Todd Kjos Signed-off-by: Greg Kroah-Hartman --- drivers/android/binder_alloc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/android/binder_alloc.c +++ b/drivers/android/binder_alloc.c @@ -666,7 +666,7 @@ int binder_alloc_mmap_handler(struct bin goto err_already_mapped; } - area = get_vm_area(vma->vm_end - vma->vm_start, VM_IOREMAP); + area = get_vm_area(vma->vm_end - vma->vm_start, VM_ALLOC); if (area == NULL) { ret = -ENOMEM; failure_string = "get_vm_area"; Patches currently in stable-queue which might be from opensource.ganesh@gmail.com are queue-4.15/android-binder-use-vm_alloc-to-get-vm-area.patch