linux-kernel - [PATCH] android: binder: use VM

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Date:   Thu,  1 Sep 2016 14:41:04 +0800
From:   Ganesh Mahendran <opensource.ganesh@...il.com>
To:     gregkh@...uxfoundation.org, arve@...roid.com, riandrews@...roid.com
Cc:     devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        Ganesh Mahendran <opensource.ganesh@...il.com>
Subject: [PATCH] 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.

Also 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 use VM_ALLOC to get vm area.

Signed-off-by: Ganesh Mahendran <opensource.ganesh@...il.com>
---
 drivers/android/binder.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index 16288e7..3511d5c 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -2885,7 +2885,7 @@ static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
 		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";
-- 
1.9.1