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Date:   Fri, 25 Jan 2019 15:16:42 +0000
From:   Catalin Marinas <catalin.marinas@arm.com>
To:     Arnd Bergmann <arnd@arndb.de>
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Subject: Re: [PATCH v2 06/29] ARM: add migrate_pages() system call
Message-ID: <20190125151641.GF25901@arrakis.emea.arm.com>
References: <20190118161835.2259170-1-arnd@arndb.de>
 <20190118161835.2259170-7-arnd@arndb.de>
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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>