From b28bb9199f8bcd497df42b79474dd2ced6993cae Mon Sep 17 00:00:00 2001 From: Ganesh Mahendran Date: Wed, 10 Jan 2018 10:49:05 +0800 Subject: UPSTREAM: android: binder: use VM_ALLOC to get vm area 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 Cc: stable ---- V3: update comments V2: update comments Signed-off-by: Greg Kroah-Hartman (cherry picked from commit aac6830ec1cb681544212838911cdc57f2638216) Change-Id: Ide458abc6a4d3ec07973733aa223c4247eef20e6 --- drivers/android/binder_alloc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers') diff --git a/drivers/android/binder_alloc.c b/drivers/android/binder_alloc.c index 30579eb2d..cf6daeb27 100644 --- a/drivers/android/binder_alloc.c +++ b/drivers/android/binder_alloc.c @@ -610,7 +610,7 @@ int binder_alloc_mmap_handler(struct binder_alloc *alloc, 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"; -- cgit v1.2.3