Commit 15626062 authored Oct 08, 2012 by Gerald Schaefer Committed by Linus Torvalds Oct 09, 2012

thp, x86: introduce HAVE_ARCH_TRANSPARENT_HUGEPAGE



Cleanup patch in preparation for transparent hugepage support on s390.
Adding new architectures to the TRANSPARENT_HUGEPAGE config option can
make the "depends" line rather ugly, like "depends on (X86 || (S390 &&
64BIT)) && MMU".

This patch adds a HAVE_ARCH_TRANSPARENT_HUGEPAGE instead.  x86 already has
MMU "def_bool y", so the MMU check is superfluous there and
HAVE_ARCH_TRANSPARENT_HUGEPAGE can be selected in arch/x86/Kconfig.

Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Hillf Danton <dhillf@gmail.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent ca42b26a

arch/Kconfig

+3 −0

Original line number	Diff line number	Diff line
		@@ -313,4 +313,7 @@ config HAVE_IRQ_TIME_ACCOUNTING
		Archs need to ensure they use a high enough resolution clock to
		support irq time accounting and then call enable_sched_clock_irqtime().

		config HAVE_ARCH_TRANSPARENT_HUGEPAGE
		bool

		source "kernel/gcov/Kconfig"

arch/x86/Kconfig

+1 −0

Original line number	Diff line number	Diff line
		@@ -88,6 +88,7 @@ config X86
		select IRQ_FORCED_THREADING
		select USE_GENERIC_SMP_HELPERS if SMP
		select HAVE_BPF_JIT if X86_64
		select HAVE_ARCH_TRANSPARENT_HUGEPAGE
		select CLKEVT_I8253
		select ARCH_HAVE_NMI_SAFE_CMPXCHG
		select GENERIC_IOMAP

mm/Kconfig

+1 −1

Original line number	Diff line number	Diff line
		@@ -318,7 +318,7 @@ config NOMMU_INITIAL_TRIM_EXCESS

		config TRANSPARENT_HUGEPAGE
		bool "Transparent Hugepage Support"
		depends on X86 && MMU
		depends on HAVE_ARCH_TRANSPARENT_HUGEPAGE
		select COMPACTION
		help
		Transparent Hugepages allows the kernel to use huge pages and

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