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SubjectRe: [PATCH 1/4] mm: Remove dependency on CONFIG_FLATMEM from online_page()
On Thu, May 12, 2011 at 12:26:22PM -0700, David Rientjes wrote:
> On Thu, 12 May 2011, Daniel Kiper wrote:
>
> > > > Memory hotplug code strictly depends on CONFIG_SPARSEMEM.
> > > > It means that code depending on CONFIG_FLATMEM in online_page()
> > > > is never compiled. Remove it because it is not needed anymore.
> > > >
> > > > Signed-off-by: Daniel Kiper <dkiper@net-space.pl>
> > >
> > > The code you're patching depends on CONFIG_MEMORY_HOTPLUG_SPARSE, so this
> > > is valid. The changelog should be updated to reflect that, however.
> > >
> > > Acked-by: David Rientjes <rientjes@google.com>
> >
> > No problem, however, this bundle of patches was added to the -mm tree.
> > In this situation should I repost whole bundle with relevant changes
> > or post only those two patches requested by you ??? For which tree
> > should I prepare new version of patches ???
> >
>
> No, I would just reply to the email notification you received when the
> patch went into -mm saying that the changelog should be adjusted to read
> something like
>
> online_pages() is only compiled for CONFIG_MEMORY_HOTPLUG_SPARSE,
> so there is no need to support CONFIG_FLATMEM code within it.
>
> This patch removes code that is never used.

Please look into attachments.

If you have any questions please drop me a line.

Daniel
From akpm@linux-foundation.org Wed May 4 01:36:10 2011
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Message-Id: <201105032335.p43NZsk4017523@imap1.linux-foundation.org>
Subject: + mm-enable-set_page_section-only-if-config_sparsemem-and-config_sparsemem_vmemmap.patch added to -mm tree
To: mm-commits@vger.kernel.org
Cc: dkiper@net-space.pl, dave@linux.vnet.ibm.com
From: akpm@linux-foundation.org
Date: Tue, 03 May 2011 16:35:54 -0700
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The patch titled
mm: enable set_page_section() only if CONFIG_SPARSEMEM and !CONFIG_SPARSEMEM_VMEMMAP
has been added to the -mm tree. Its filename is
mm-enable-set_page_section-only-if-config_sparsemem-and-config_sparsemem_vmemmap.patch

Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/SubmitChecklist when testing your code ***

See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find
out what to do about this

The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/

------------------------------------------------------
Subject: mm: enable set_page_section() only if CONFIG_SPARSEMEM and !CONFIG_SPARSEMEM_VMEMMAP
From: Daniel Kiper <dkiper@net-space.pl>

set_page_section() is valid only in CONFIG_SPARSEMEM and
!CONFIG_SPARSEMEM_VMEMMAP context. Move it to proper place and amend
accordingly functions which are using it.

Signed-off-by: Daniel Kiper <dkiper@net-space.pl>
Acked-by: Dave Hansen <dave@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

include/linux/mm.h | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)

diff -puN include/linux/mm.h~mm-enable-set_page_section-only-if-config_sparsemem-and-config_sparsemem_vmemmap include/linux/mm.h
--- a/include/linux/mm.h~mm-enable-set_page_section-only-if-config_sparsemem-and-config_sparsemem_vmemmap
+++ a/include/linux/mm.h
@@ -682,6 +682,12 @@ static inline struct zone *page_zone(str
}

#if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
+static inline void set_page_section(struct page *page, unsigned long section)
+{
+ page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT);
+ page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT;
+}
+
static inline unsigned long page_to_section(struct page *page)
{
return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK;
@@ -700,18 +706,14 @@ static inline void set_page_node(struct
page->flags |= (node & NODES_MASK) << NODES_PGSHIFT;
}

-static inline void set_page_section(struct page *page, unsigned long section)
-{
- page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT);
- page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT;
-}
-
static inline void set_page_links(struct page *page, enum zone_type zone,
unsigned long node, unsigned long pfn)
{
set_page_zone(page, zone);
set_page_node(page, node);
+#if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
set_page_section(page, pfn_to_section_nr(pfn));
+#endif
}

/*
_
Patches currently in -mm which might be from dkiper@net-space.pl are

linux-next.patch
mm-remove-dependency-on-config_flatmem-from-online_page.patch
mm-enable-set_page_section-only-if-config_sparsemem-and-config_sparsemem_vmemmap.patch
mm-pfn_to_section_nr-section_nr_to_pfn-is-valid-only-in-config_sparsemem-context.patch
mm-do-not-define-pfn_section_shift-if-config_sparsemem.patch


From akpm@linux-foundation.org Wed May 4 01:36:13 2011
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Subject: + mm-remove-dependency-on-config_flatmem-from-online_page.patch added to -mm tree
To: mm-commits@vger.kernel.org
Cc: dkiper@net-space.pl, dave@linux.vnet.ibm.com
From: akpm@linux-foundation.org
Date: Tue, 03 May 2011 16:35:52 -0700
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The patch titled
mm: remove dependency on CONFIG_FLATMEM from online_page()
has been added to the -mm tree. Its filename is
mm-remove-dependency-on-config_flatmem-from-online_page.patch

Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/SubmitChecklist when testing your code ***

See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find
out what to do about this

The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/

------------------------------------------------------
Subject: mm: remove dependency on CONFIG_FLATMEM from online_page()
From: Daniel Kiper <dkiper@net-space.pl>

Memory hotplug code strictly depends on CONFIG_SPARSEMEM. It means that
code depending on CONFIG_FLATMEM in online_page() is never compiled.
Remove it because it is not needed anymore.

Signed-off-by: Daniel Kiper <dkiper@net-space.pl>
Acked-by: Dave Hansen <dave@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

mm/memory_hotplug.c | 4 ----
1 file changed, 4 deletions(-)

diff -puN mm/memory_hotplug.c~mm-remove-dependency-on-config_flatmem-from-online_page mm/memory_hotplug.c
--- a/mm/memory_hotplug.c~mm-remove-dependency-on-config_flatmem-from-online_page
+++ a/mm/memory_hotplug.c
@@ -374,10 +374,6 @@ void online_page(struct page *page)
totalhigh_pages++;
#endif

-#ifdef CONFIG_FLATMEM
- max_mapnr = max(pfn, max_mapnr);
-#endif
-
ClearPageReserved(page);
init_page_count(page);
__free_page(page);
_
Patches currently in -mm which might be from dkiper@net-space.pl are

linux-next.patch
mm-remove-dependency-on-config_flatmem-from-online_page.patch
mm-enable-set_page_section-only-if-config_sparsemem-and-config_sparsemem_vmemmap.patch
mm-pfn_to_section_nr-section_nr_to_pfn-is-valid-only-in-config_sparsemem-context.patch
mm-do-not-define-pfn_section_shift-if-config_sparsemem.patch


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