# Re: \[PATCH v2 06/29\] ARM: add migrate\_pages() system call

- From: Catalin Marinas \<catalin.marinas@arm.com\>
- Date: 2019-01-25 15:17:01 
- List: linux-arm-kernel
- Page: https://ratatoskr.run/linux-arm-kernel/2019/01/149681
- Thread: https://ratatoskr.run/linux-api/2019/01/149302/t.md

```text
On Fri, Jan 18, 2019 at 05:18:12PM +0100, Arnd Bergmann wrote:
> The migrate_pages system call has an assigned number on all architectures
> except ARM. When it got added initially in commit d80ade7b3231 ("ARM:
> Fix warning: #warning syscall migrate_pages not implemented"), it was
> intentionally left out based on the observation that there are no 32-bit
> ARM NUMA systems.
> 
> However, there are now arm64 NUMA machines that can in theory run 32-bit
> kernels (actually enabling NUMA there would require additional work)
> as well as 32-bit user space on 64-bit kernels, so that argument is no
> longer very strong.
> 
> Assigning the number lets us use the system call on 64-bit kernels as well
> as providing a more consistent set of syscalls across architectures.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

For the arm64 part:

Acked-by: Catalin Marinas <catalin.marinas@arm.com>

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