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authorGerald Schaefer <gerald.schaefer@de.ibm.com>2012-10-08 16:30:04 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-09 16:22:29 +0900
commit15626062f4a98279c59a2a5208c496cf65cbf8c0 (patch)
tree793c32816204cc879c1c80065c5cc24789ab4b3b
parentca42b26ab285edc5ee3f9faa48379d258db53c35 (diff)
downloadlinux-15626062f4a98279c59a2a5208c496cf65cbf8c0.tar.bz2
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>
-rw-r--r--arch/Kconfig3
-rw-r--r--arch/x86/Kconfig1
-rw-r--r--mm/Kconfig2
3 files changed, 5 insertions, 1 deletions
diff --git a/arch/Kconfig b/arch/Kconfig
index a62965d057f6..550cce4dd648 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -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"
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 6119d6c7002e..1ae94bcae5d9 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -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
diff --git a/mm/Kconfig b/mm/Kconfig
index d5c8019c6627..3322342a1ffb 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -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