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Commit 2e3ca40f authored by Pavel Tatashin's avatar Pavel Tatashin Committed by Linus Torvalds
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mm: relax deferred struct page requirements 

There is no need to have ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT, as all
the page initialization code is in common code.

Also, there is no need to depend on MEMORY_HOTPLUG, as initialization
code does not really use hotplug memory functionality.  So, we can
remove this requirement as well.

This patch allows to use deferred struct page initialization on all
platforms with memblock allocator.

Tested on x86, arm64, and sparc.  Also, verified that code compiles on
PPC with CONFIG_MEMORY_HOTPLUG disabled.

Link: http://lkml.kernel.org/r/20171117014601.31606-1-pasha.tatashin@oracle.com


Signed-off-by: default avatarPavel Tatashin <pasha.tatashin@oracle.com>
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>	[s390]
Reviewed-by: default avatarKhalid Aziz <khalid.aziz@oracle.com>
Acked-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Acked-by: default avatarMichal Hocko <mhocko@suse.com>
Cc: Steven Sistare <steven.sistare@oracle.com>
Cc: Daniel Jordan <daniel.m.jordan@oracle.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Reza Arbab <arbab@linux.vnet.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent a85f878b

arch/powerpc/Kconfig

+0 −1
Original line number Diff line number Diff line
@@ -151,7 +151,6 @@ config PPC 
	select ARCH_MIGHT_HAVE_PC_PARPORT

	select ARCH_MIGHT_HAVE_PC_SERIO

	select ARCH_SUPPORTS_ATOMIC_RMW

	select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT

	select ARCH_USE_BUILTIN_BSWAP

	select ARCH_USE_CMPXCHG_LOCKREF		if PPC64

	select ARCH_WANT_IPC_PARSE_VERSION

arch/s390/Kconfig

+0 −1
Original line number Diff line number Diff line
@@ -108,7 +108,6 @@ config S390 
	select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE

	select ARCH_SAVE_PAGE_KEYS if HIBERNATION

	select ARCH_SUPPORTS_ATOMIC_RMW

	select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT

	select ARCH_SUPPORTS_NUMA_BALANCING

	select ARCH_USE_BUILTIN_BSWAP

	select ARCH_USE_CMPXCHG_LOCKREF

arch/x86/Kconfig

+0 −1
Original line number Diff line number Diff line
@@ -69,7 +69,6 @@ config X86 
	select ARCH_MIGHT_HAVE_PC_PARPORT

	select ARCH_MIGHT_HAVE_PC_SERIO

	select ARCH_SUPPORTS_ATOMIC_RMW

	select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT

	select ARCH_SUPPORTS_NUMA_BALANCING	if X86_64

	select ARCH_USE_BUILTIN_BSWAP

	select ARCH_USE_QUEUED_RWLOCKS

mm/Kconfig

+1 −6
Original line number Diff line number Diff line
@@ -639,15 +639,10 @@ config MAX_STACK_SIZE_MB 


	  A sane initial value is 80 MB.



# For architectures that support deferred memory initialisation

config ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT

	bool



config DEFERRED_STRUCT_PAGE_INIT

	bool "Defer initialisation of struct pages to kthreads"

	default n

	depends on ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT

	depends on NO_BOOTMEM && MEMORY_HOTPLUG

	depends on NO_BOOTMEM

	depends on !FLATMEM

	help

	  Ordinarily all struct pages are initialised during early boot in a