From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757272AbZCDSAR (ORCPT ); Wed, 4 Mar 2009 13:00:17 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754429AbZCDSAA (ORCPT ); Wed, 4 Mar 2009 13:00:00 -0500 Received: from mx3.mail.elte.hu ([157.181.1.138]:46307 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754391AbZCDR77 (ORCPT ); Wed, 4 Mar 2009 12:59:59 -0500 Date: Wed, 4 Mar 2009 18:59:44 +0100 From: Ingo Molnar To: Pekka Enberg Cc: linux-kernel@vger.kernel.org, x86@kernel.org, Mel Gorman Subject: Re: [PATCH] x86: set_highmem_pages_init() cleanup Message-ID: <20090304175944.GA1537@elte.hu> References: <1236082212.2675.24.camel@penberg-laptop> <20090303121532.GC5740@elte.hu> <1236154567.29024.23.camel@penberg-laptop> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1236154567.29024.23.camel@penberg-laptop> User-Agent: Mutt/1.5.18 (2008-05-17) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.3 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Pekka Enberg wrote: > On Tue, 2009-03-03 at 13:15 +0100, Ingo Molnar wrote: > > * Pekka Enberg wrote: > > > > > From: Pekka Enberg > > > > > > Impact: cleanup > > > > > > This patch moves set_highmem_pages_init() to arch/x86/mm/highmem_32.c. The > > > declaration of the function is kept in asm/numa_32.h because asm/highmem.h is > > > included only CONFIG_HIGHMEM is enabled so we can't put the empty static inline > > > function there. > > > > > > Signed-off-by: Pekka Enberg > > > --- > > > arch/x86/include/asm/numa_32.h | 6 +++++- > > > arch/x86/mm/highmem_32.c | 34 ++++++++++++++++++++++++++++++++++ > > > arch/x86/mm/init_32.c | 12 ------------ > > > arch/x86/mm/numa_32.c | 26 -------------------------- > > > 4 files changed, 39 insertions(+), 39 deletions(-) > > > > Applied, thanks! > > > > One question: > > > > > diff --git a/arch/x86/include/asm/numa_32.h b/arch/x86/include/asm/numa_32.h > > > index e9f5db7..a372290 100644 > > > --- a/arch/x86/include/asm/numa_32.h > > > +++ b/arch/x86/include/asm/numa_32.h > > > @@ -4,8 +4,12 @@ > > > extern int pxm_to_nid(int pxm); > > > extern void numa_remove_cpu(int cpu); > > > > > > -#ifdef CONFIG_NUMA > > > +#ifdef CONFIG_HIGHMEM > > > extern void set_highmem_pages_init(void); > > > +#else > > > +static inline void set_highmem_pages_init(void) > > > +{ > > > +} > > > #endif > > > > > > #endif /* _ASM_X86_NUMA_32_H */ > > > diff --git a/arch/x86/mm/highmem_32.c b/arch/x86/mm/highmem_32.c > > > index bcc079c..13a823c 100644 > > > --- a/arch/x86/mm/highmem_32.c > > > +++ b/arch/x86/mm/highmem_32.c > > > @@ -1,5 +1,6 @@ > > > #include > > > #include > > > +#include /* for totalram_pages */ > > > > > > void *kmap(struct page *page) > > > { > > > @@ -156,3 +157,36 @@ EXPORT_SYMBOL(kmap); > > > EXPORT_SYMBOL(kunmap); > > > EXPORT_SYMBOL(kmap_atomic); > > > EXPORT_SYMBOL(kunmap_atomic); > > > + > > > +#ifdef CONFIG_NUMA > > > +void __init set_highmem_pages_init(void) > > > +{ > > > + struct zone *zone; > > > + int nid; > > > + > > > + for_each_zone(zone) { > > > + unsigned long zone_start_pfn, zone_end_pfn; > > > + > > > + if (!is_highmem(zone)) > > > + continue; > > > + > > > + zone_start_pfn = zone->zone_start_pfn; > > > + zone_end_pfn = zone_start_pfn + zone->spanned_pages; > > > + > > > + nid = zone_to_nid(zone); > > > + printk(KERN_INFO "Initializing %s for node %d (%08lx:%08lx)\n", > > > + zone->name, nid, zone_start_pfn, zone_end_pfn); > > > + > > > + add_highpages_with_active_regions(nid, zone_start_pfn, > > > + zone_end_pfn); > > > + } > > > + totalram_pages += totalhigh_pages; > > > +} > > > +#else > > > +static void __init set_highmem_pages_init(void) > > > +{ > > > + add_highpages_with_active_regions(0, highstart_pfn, highend_pfn); > > > + > > > + totalram_pages += totalhigh_pages; > > > +} > > > +#endif /* CONFIG_NUMA */ > > > > Couldnt we just wrap the !NUMA case into the NUMA case and just > > have the NUMA function present, by making for_each_zone() a > > two-entries matter and making the second entry contain: > > > > zone->zone_start_pfn := highstart_pfn > > zone->spanned_pages := highend_pfn-highstart_pfn > > OK, I don't quite understand your suggestion here. The zones > are set up completely at this stage so AFAICT, even for the > UMA case, there should be a highmem zone there. So unless I am > missing something here, I think we can get away with something > as simple as the following. ok, good - it is an easier cleanup than i hoped it would be :-) Ingo