android: binder: use VM_ALLOC to get vm area
commit aac6830ec1
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 <opensource.ganesh@gmail.com>
Acked-by: Martijn Coenen <maco@android.com>
Acked-by: Todd Kjos <tkjos@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
parent
7a3cee43e9
commit
86eda3864a
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@ -668,7 +668,7 @@ int binder_alloc_mmap_handler(struct binder_alloc *alloc,
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goto err_already_mapped;
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}
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area = get_vm_area(vma->vm_end - vma->vm_start, VM_IOREMAP);
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area = get_vm_area(vma->vm_end - vma->vm_start, VM_ALLOC);
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if (area == NULL) {
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ret = -ENOMEM;
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failure_string = "get_vm_area";
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