linux-kernel - Re: [PATCH 3/3] mm: Introduce HAVE_ARCH_TRANSPARENT

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Date:	Thu, 13 Sep 2012 14:40:25 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Stephen Rothwell <sfr@...b.auug.org.au>
Cc:	Will Deacon <will.deacon@....com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	mhocko@...e.cz, Steve Capper <steve.capper@....com>,
	Gerald Schaefer <gerald.schaefer@...ibm.com>
Subject: Re: [PATCH 3/3] mm: Introduce HAVE_ARCH_TRANSPARENT_HUGEPAGE

On Fri, 14 Sep 2012 07:27:32 +1000
Stephen Rothwell <sfr@...b.auug.org.au> wrote:

> Hi Andrew,
> 
> On Thu, 13 Sep 2012 12:05:14 -0700 Andrew Morton <akpm@...ux-foundation.org> wrote:
> >
> > diff -puN arch/x86/Kconfig~mm-introduce-have_arch_transparent_hugepage arch/x86/Kconfig
> > --- a/arch/x86/Kconfig~mm-introduce-have_arch_transparent_hugepage
> > +++ a/arch/x86/Kconfig
> > @@ -83,7 +83,6 @@ 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
> 
> Why not
> 	select HAVE_ARCH_TRANSPARENT_HUGEPAGE if MMU
> 

Well, this is in arch/x86/Kconfig, where MMU is known to always be set.

Yes, I think Gerald's patch will suffice:

--- a/arch/Kconfig~thp-x86-introduce-have_arch_transparent_hugepage
+++ a/arch/Kconfig
@@ -326,4 +326,7 @@ config HAVE_RCU_USER_QS
 	  are already protected inside rcu_irq_enter/rcu_irq_exit() but
 	  preemption or signal handling on irq exit still need to be protected.
 
+config HAVE_ARCH_TRANSPARENT_HUGEPAGE
+	bool
+
 source "kernel/gcov/Kconfig"
--- a/arch/x86/Kconfig~thp-x86-introduce-have_arch_transparent_hugepage
+++ a/arch/x86/Kconfig
@@ -83,6 +83,7 @@ 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
--- a/mm/Kconfig~thp-x86-introduce-have_arch_transparent_hugepage
+++ a/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
_

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