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] Reviewed-by: Khalid Aziz <khalid.aziz@xxxxxxxxxx> Acked-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx> Acked-by: Michal Hocko <mhocko@xxxxxxxx> 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: 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 @@ -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 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 _ -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
