The patch titled
Subject: mm: relax deferred struct page requirements
has been added to the -mm tree. Its filename is
mm-relax-deferred-struct-page-requirements.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-relax-deferred-struct-page-requirements.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-relax-deferred-struct-page-requirements.patch
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------------------------------------------------------
From: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>
Subject: 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@xxxxxxxxxx
Signed-off-by: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>
Acked-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx> [s390]
Cc: Steven Sistare <steven.sistare@xxxxxxxxxx>
Cc: Daniel Jordan <daniel.m.jordan@xxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Reza Arbab <arbab@xxxxxxxxxxxxxxxxxx>
Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/Kconfig | 1 -
arch/s390/Kconfig | 1 -
arch/x86/Kconfig | 1 -
mm/Kconfig | 7 +------
4 files changed, 1 insertion(+), 9 deletions(-)
diff -puN arch/powerpc/Kconfig~mm-relax-deferred-struct-page-requirements arch/powerpc/Kconfig
--- a/arch/powerpc/Kconfig~mm-relax-deferred-struct-page-requirements
+++ a/arch/powerpc/Kconfig
@@ -150,7 +150,6 @@ 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
diff -puN arch/s390/Kconfig~mm-relax-deferred-struct-page-requirements arch/s390/Kconfig
--- a/arch/s390/Kconfig~mm-relax-deferred-struct-page-requirements
+++ a/arch/s390/Kconfig
@@ -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
diff -puN arch/x86/Kconfig~mm-relax-deferred-struct-page-requirements arch/x86/Kconfig
--- a/arch/x86/Kconfig~mm-relax-deferred-struct-page-requirements
+++ a/arch/x86/Kconfig
@@ -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
diff -puN mm/Kconfig~mm-relax-deferred-struct-page-requirements mm/Kconfig
--- a/mm/Kconfig~mm-relax-deferred-struct-page-requirements
+++ a/mm/Kconfig
@@ -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
_
Patches currently in -mm which might be from pasha.tatashin@xxxxxxxxxx are
mm-relax-deferred-struct-page-requirements.patch
sparc64-ng4-memset-32-bits-overflow.patch
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