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Commit 78594b95 authored Dec 30, 2018 by Arnd Bergmann

ARM: add migrate_pages() system call



The migrate_pages system call has an assigned number on all architectures
except ARM. When it got added initially in commit d80ade7b ("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>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>

parent 12b57c5c

arch/arm/include/asm/unistd.h

+0 −1

Original line number	Diff line number	Diff line
		@@ -45,7 +45,6 @@
		* Unimplemented (or alternatively implemented) syscalls
		*/
		#define __IGNORE_fadvise64_64
		#define __IGNORE_migrate_pages

		#ifdef __ARM_EABI__
		/*

arch/arm/tools/syscall.tbl

+1 −0

Original line number	Diff line number	Diff line
		@@ -414,3 +414,4 @@
		397 common statx sys_statx
		398 common rseq sys_rseq
		399 common io_pgetevents sys_io_pgetevents
		400 common migrate_pages sys_migrate_pages

arch/arm64/include/asm/unistd.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -44,7 +44,7 @@
		#define __ARM_NR_compat_set_tls (__ARM_NR_COMPAT_BASE + 5)
		#define __ARM_NR_COMPAT_END (__ARM_NR_COMPAT_BASE + 0x800)

		#define __NR_compat_syscalls 400
		#define __NR_compat_syscalls 401
		#endif

		#define __ARCH_WANT_SYS_CLONE

arch/arm64/include/asm/unistd32.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -821,6 +821,8 @@ __SYSCALL(__NR_statx, sys_statx)
		__SYSCALL(__NR_rseq, sys_rseq)
		#define __NR_io_pgetevents 399
		__SYSCALL(__NR_io_pgetevents, compat_sys_io_pgetevents)
		#define __NR_migrate_pages 400
		__SYSCALL(__NR_migrate_pages, compat_sys_migrate_pages)

		/*
		* Please add new compat syscalls above this comment and update