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[PATCH v2 12/12] mm: memory_hotplug: memory hotremove supports thp migration

Started byNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>
First post2016-11-08 00:40 +0100
Last post2016-11-08 02:50 +0100
Articles 4 — 2 participants

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  [PATCH v2 12/12] mm: memory_hotplug: memory hotremove supports thp migration Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> - 2016-11-08 00:40 +0100
    Re: [PATCH v2 12/12] mm: memory_hotplug: memory hotremove supports  thp migration kbuild test robot <lkp@intel.com> - 2016-11-08 01:40 +0100
    [PATCH] mm: fix unused variable warning Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> - 2016-11-08 02:50 +0100
    Re: [PATCH v2 12/12] mm: memory_hotplug: memory hotremove supports  thp migration Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> - 2016-11-08 02:50 +0100

#1516669 — [PATCH v2 12/12] mm: memory_hotplug: memory hotremove supports thp migration

FromNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Date2016-11-08 00:40 +0100
Subject[PATCH v2 12/12] mm: memory_hotplug: memory hotremove supports thp migration
Message-ID<sB1Ga-1xZ-31@gated-at.bofh.it>
This patch enables thp migration for memory hotremove.

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
---
ChangeLog v1->v2:
- base code switched from alloc_migrate_target to new_node_page()
---
 mm/memory_hotplug.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git v4.9-rc2-mmotm-2016-10-27-18-27/mm/memory_hotplug.c v4.9-rc2-mmotm-2016-10-27-18-27_patched/mm/memory_hotplug.c
index b18dab40..a9c3fe1 100644
--- v4.9-rc2-mmotm-2016-10-27-18-27/mm/memory_hotplug.c
+++ v4.9-rc2-mmotm-2016-10-27-18-27_patched/mm/memory_hotplug.c
@@ -1543,6 +1543,7 @@ static struct page *new_node_page(struct page *page, unsigned long private,
 	int nid = page_to_nid(page);
 	nodemask_t nmask = node_states[N_MEMORY];
 	struct page *new_page = NULL;
+	unsigned int order = 0;
 
 	/*
 	 * TODO: allocate a destination hugepage from a nearest neighbor node,
@@ -1553,6 +1554,11 @@ static struct page *new_node_page(struct page *page, unsigned long private,
 		return alloc_huge_page_node(page_hstate(compound_head(page)),
 					next_node_in(nid, nmask));
 
+	if (thp_migration_supported() && PageTransHuge(page)) {
+		order = HPAGE_PMD_ORDER;
+		gfp_mask |= GFP_TRANSHUGE;
+	}
+
 	node_clear(nid, nmask);
 
 	if (PageHighMem(page)
@@ -1560,12 +1566,15 @@ static struct page *new_node_page(struct page *page, unsigned long private,
 		gfp_mask |= __GFP_HIGHMEM;
 
 	if (!nodes_empty(nmask))
-		new_page = __alloc_pages_nodemask(gfp_mask, 0,
+		new_page = __alloc_pages_nodemask(gfp_mask, order,
 					node_zonelist(nid, gfp_mask), &nmask);
 	if (!new_page)
-		new_page = __alloc_pages(gfp_mask, 0,
+		new_page = __alloc_pages(gfp_mask, order,
 					node_zonelist(nid, gfp_mask));
 
+	if (new_page && order == HPAGE_PMD_ORDER)
+		prep_transhuge_page(new_page);
+
 	return new_page;
 }
 
@@ -1595,7 +1604,9 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
 			if (isolate_huge_page(page, &source))
 				move_pages -= 1 << compound_order(head);
 			continue;
-		}
+		} else if (thp_migration_supported() && PageTransHuge(page))
+			pfn = page_to_pfn(compound_head(page))
+				+ HPAGE_PMD_NR - 1;
 
 		if (!get_page_unless_zero(page))
 			continue;
-- 
2.7.0

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#1516705 — Re: [PATCH v2 12/12] mm: memory_hotplug: memory hotremove supports thp migration

Fromkbuild test robot <lkp@intel.com>
Date2016-11-08 01:40 +0100
SubjectRe: [PATCH v2 12/12] mm: memory_hotplug: memory hotremove supports thp migration
Message-ID<sB2Cd-29A-7@gated-at.bofh.it>
In reply to#1516669

[Multipart message — attachments visible in raw view] — view raw

Hi Naoya,

[auto build test WARNING on mmotm/master]
[also build test WARNING on next-20161028]
[cannot apply to v4.9-rc4]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Naoya-Horiguchi/mm-x86-move-_PAGE_SWP_SOFT_DIRTY-from-bit-7-to-bit-6/20161108-080615
base:   git://git.cmpxchg.org/linux-mmotm.git master
config: i386-randconfig-x000-201645 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   Cyclomatic Complexity 3 mm/memory_hotplug.c:setup_memhp_default_state
   Cyclomatic Complexity 6 mm/memory_hotplug.c:find_smallest_section_pfn
   Cyclomatic Complexity 6 mm/memory_hotplug.c:find_biggest_section_pfn
   Cyclomatic Complexity 9 mm/memory_hotplug.c:shrink_pgdat_span
   Cyclomatic Complexity 1 include/linux/err.h:IS_ERR
   Cyclomatic Complexity 2 include/linux/page-flags.h:compound_head
   Cyclomatic Complexity 1 include/linux/page_ref.h:page_count
   Cyclomatic Complexity 2 include/linux/thread_info.h:test_ti_thread_flag
   Cyclomatic Complexity 1 include/linux/sched.h:test_tsk_thread_flag
   Cyclomatic Complexity 1 include/linux/sched.h:signal_pending
   Cyclomatic Complexity 0 include/linux/memory_hotplug.h:generic_alloc_nodedata
   Cyclomatic Complexity 3 mm/memory_hotplug.c:next_active_pageblock
   Cyclomatic Complexity 1 mm/memory_hotplug.c:__online_page_increment_counters
   Cyclomatic Complexity 1 include/linux/mm.h:__free_reserved_page
   Cyclomatic Complexity 1 include/linux/mm.h:free_reserved_page
   Cyclomatic Complexity 1 mm/memory_hotplug.c:__online_page_free
   Cyclomatic Complexity 1 mm/memory_hotplug.c:generic_online_page
   Cyclomatic Complexity 1 include/linux/mm.h:put_page_testzero
   Cyclomatic Complexity 4 mm/memory_hotplug.c:check_hotplug_memory_range
   Cyclomatic Complexity 1 mm/memory_hotplug.c:cmdline_parse_movable_node
   Cyclomatic Complexity 2 mm/memory_hotplug.c:ensure_zone_is_initialized
   Cyclomatic Complexity 1 include/linux/seqlock.h:write_seqcount_begin_nested
   Cyclomatic Complexity 1 include/linux/seqlock.h:write_seqcount_begin
   Cyclomatic Complexity 1 include/linux/seqlock.h:write_seqlock
   Cyclomatic Complexity 1 include/linux/memory_hotplug.h:zone_span_writelock
   Cyclomatic Complexity 1 include/linux/seqlock.h:write_seqcount_end
   Cyclomatic Complexity 1 include/linux/seqlock.h:write_sequnlock
   Cyclomatic Complexity 1 include/linux/memory_hotplug.h:zone_span_writeunlock
   Cyclomatic Complexity 3 mm/memory_hotplug.c:grow_zone_span
   Cyclomatic Complexity 4 mm/memory_hotplug.c:__add_zone
   Cyclomatic Complexity 4 mm/memory_hotplug.c:__add_section
   Cyclomatic Complexity 7 mm/memory_hotplug.c:__add_pages
   Cyclomatic Complexity 9 mm/memory_hotplug.c:shrink_zone_span
   Cyclomatic Complexity 1 mm/memory_hotplug.c:__remove_zone
   Cyclomatic Complexity 2 mm/memory_hotplug.c:resize_zone
   Cyclomatic Complexity 6 mm/memory_hotplug.c:move_pfn_range_left
   Cyclomatic Complexity 6 mm/memory_hotplug.c:move_pfn_range_right
   Cyclomatic Complexity 4 mm/memory_hotplug.c:move_pfn_range
   Cyclomatic Complexity 3 mm/memory_hotplug.c:__remove_section
   Cyclomatic Complexity 6 mm/memory_hotplug.c:__remove_pages
   Cyclomatic Complexity 2 mm/memory_hotplug.c:check_pages_isolated
   Cyclomatic Complexity 1 mm/memory_hotplug.c:offline_isolated_pages
   Cyclomatic Complexity 3 mm/memory_hotplug.c:hotadd_new_pgdat
   Cyclomatic Complexity 1 mm/memory_hotplug.c:online_memory_block
   Cyclomatic Complexity 1 mm/memory_hotplug.c:rollback_node_hotadd
   Cyclomatic Complexity 4 mm/memory_hotplug.c:register_memory_resource
   Cyclomatic Complexity 2 mm/memory_hotplug.c:release_memory_resource
   Cyclomatic Complexity 6 mm/memory_hotplug.c:scan_movable_pages
   Cyclomatic Complexity 1 include/linux/gfp.h:__alloc_pages
   Cyclomatic Complexity 1 include/linux/hugetlb.h:page_hstate
   Cyclomatic Complexity 3 include/linux/bitmap.h:bitmap_empty
   Cyclomatic Complexity 1 include/linux/nodemask.h:__nodes_empty
   Cyclomatic Complexity 12 mm/memory_hotplug.c:new_node_page
   Cyclomatic Complexity 3 include/linux/mm.h:put_page
   Cyclomatic Complexity 15 mm/memory_hotplug.c:do_migrate_range
   Cyclomatic Complexity 2 mm/memory_hotplug.c:check_pages_isolated_cb
   Cyclomatic Complexity 1 mm/memory_hotplug.c:offline_isolated_pages_cb
   Cyclomatic Complexity 2 mm/memory_hotplug.c:check_memblock_offlined_cb
   Cyclomatic Complexity 2 mm/memory_hotplug.c:get_online_mems
   Cyclomatic Complexity 6 mm/memory_hotplug.c:put_online_mems
   Cyclomatic Complexity 2 mm/memory_hotplug.c:set_online_page_callback
   Cyclomatic Complexity 2 mm/memory_hotplug.c:restore_online_page_callback
   Cyclomatic Complexity 2 mm/memory_hotplug.c:mem_hotplug_begin
   Cyclomatic Complexity 1 mm/memory_hotplug.c:mem_hotplug_done
   Cyclomatic Complexity 1 mm/memory_hotplug.c:get_page_bootmem
   Cyclomatic Complexity 2 mm/memory_hotplug.c:put_page_bootmem
   Cyclomatic Complexity 9 mm/memory_hotplug.c:zone_can_shift
   Cyclomatic Complexity 16 mm/memory_hotplug.c:online_pages
   Cyclomatic Complexity 4 mm/memory_hotplug.c:try_online_node
   Cyclomatic Complexity 2 mm/memory_hotplug.c:zone_for_memory
   Cyclomatic Complexity 3 mm/memory_hotplug.c:is_mem_section_removable
   Cyclomatic Complexity 7 mm/memory_hotplug.c:test_pages_in_a_zone
   Cyclomatic Complexity 22 mm/memory_hotplug.c:__offline_pages
   Cyclomatic Complexity 1 mm/memory_hotplug.c:offline_pages
   Cyclomatic Complexity 9 mm/memory_hotplug.c:walk_memory_range
   Cyclomatic Complexity 8 mm/memory_hotplug.c:add_memory_resource
   Cyclomatic Complexity 3 mm/memory_hotplug.c:add_memory
   Cyclomatic Complexity 1 mm/memory_hotplug.c:remove_memory
   In file included from include/uapi/linux/stddef.h:1:0,
                    from include/linux/stddef.h:4,
                    from mm/memory_hotplug.c:7:
   mm/memory_hotplug.c: In function 'new_node_page':
   include/linux/compiler.h:518:38: error: call to '__compiletime_assert_1575' declared with attribute error: BUILD_BUG failed
     _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
                                         ^
   include/linux/compiler.h:501:4: note: in definition of macro '__compiletime_assert'
       prefix ## suffix();    \
       ^~~~~~
   include/linux/compiler.h:518:2: note: in expansion of macro '_compiletime_assert'
     _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
     ^~~~~~~~~~~~~~~~~~~
   include/linux/bug.h:54:37: note: in expansion of macro 'compiletime_assert'
    #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
                                        ^~~~~~~~~~~~~~~~~~
   include/linux/bug.h:88:21: note: in expansion of macro 'BUILD_BUG_ON_MSG'
    #define BUILD_BUG() BUILD_BUG_ON_MSG(1, "BUILD_BUG failed")
                        ^~~~~~~~~~~~~~~~
   include/linux/huge_mm.h:181:28: note: in expansion of macro 'BUILD_BUG'
    #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
                               ^~~~~~~~~
>> include/linux/huge_mm.h:56:26: note: in expansion of macro 'HPAGE_PMD_SHIFT'
    #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
                             ^~~~~~~~~~~~~~~
>> mm/memory_hotplug.c:1575:27: note: in expansion of macro 'HPAGE_PMD_ORDER'
     if (new_page && order == HPAGE_PMD_ORDER)
                              ^~~~~~~~~~~~~~~

vim +/HPAGE_PMD_ORDER +1575 mm/memory_hotplug.c

  1559			gfp_mask |= GFP_TRANSHUGE;
  1560		}
  1561	
  1562		node_clear(nid, nmask);
  1563	
  1564		if (PageHighMem(page)
  1565		    || (zone_idx(page_zone(page)) == ZONE_MOVABLE))
  1566			gfp_mask |= __GFP_HIGHMEM;
  1567	
  1568		if (!nodes_empty(nmask))
  1569			new_page = __alloc_pages_nodemask(gfp_mask, order,
  1570						node_zonelist(nid, gfp_mask), &nmask);
  1571		if (!new_page)
  1572			new_page = __alloc_pages(gfp_mask, order,
  1573						node_zonelist(nid, gfp_mask));
  1574	
> 1575		if (new_page && order == HPAGE_PMD_ORDER)
  1576			prep_transhuge_page(new_page);
  1577	
  1578		return new_page;
  1579	}
  1580	
  1581	#define NR_OFFLINE_AT_ONCE_PAGES	(256)
  1582	static int
  1583	do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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#1516720 — [PATCH] mm: fix unused variable warning

FromNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Date2016-11-08 02:50 +0100
Subject[PATCH] mm: fix unused variable warning
Message-ID<sB3HX-2KB-7@gated-at.bofh.it>
In reply to#1516669
Fix the following warning:

  mm/memory_hotplug.c: In function 'try_offline_node':
  mm/memory_hotplug.c:2131:6: warning: unused variable 'i' [-Wunused-variable]
    int i;
        ^

Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
---
 mm/memory_hotplug.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 534348ddd285..d612a75ceec4 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -2128,7 +2128,6 @@ void try_offline_node(int nid)
 	unsigned long start_pfn = pgdat->node_start_pfn;
 	unsigned long end_pfn = start_pfn + pgdat->node_spanned_pages;
 	unsigned long pfn;
-	int i;
 
 	for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
 		unsigned long section_nr = pfn_to_section_nr(pfn);
-- 
2.7.4

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#1516723 — Re: [PATCH v2 12/12] mm: memory_hotplug: memory hotremove supports thp migration

FromNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Date2016-11-08 02:50 +0100
SubjectRe: [PATCH v2 12/12] mm: memory_hotplug: memory hotremove supports thp migration
Message-ID<sB3HX-2KB-5@gated-at.bofh.it>
In reply to#1516669
On Tue, Nov 08, 2016 at 08:30:10AM +0800, kbuild test robot wrote:
> Hi Naoya,
> 
> [auto build test WARNING on mmotm/master]
> [also build test WARNING on next-20161028]
> [cannot apply to v4.9-rc4]
> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
> 
> url:    https://github.com/0day-ci/linux/commits/Naoya-Horiguchi/mm-x86-move-_PAGE_SWP_SOFT_DIRTY-from-bit-7-to-bit-6/20161108-080615
> base:   git://git.cmpxchg.org/linux-mmotm.git master
> config: x86_64-randconfig-x003-201645 (attached as .config)
> compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
> reproduce:
>         # save the attached .config to linux build tree
>         make ARCH=x86_64 
> 
> All warnings (new ones prefixed by >>):
> 
>    mm/memory_hotplug.c: In function 'try_offline_node':
>    mm/memory_hotplug.c:2131:6: warning: unused variable 'i' [-Wunused-variable]
>      int i;
>          ^
>    In file included from include/uapi/linux/stddef.h:1:0,
>                     from include/linux/stddef.h:4,
>                     from mm/memory_hotplug.c:7:

This seems unrelated to my patchset, but the fix is easy.
I'll post a separate patch later.

>    mm/memory_hotplug.c: In function 'new_node_page':
>    include/linux/compiler.h:518:38: error: call to '__compiletime_assert_1575' declared with attribute error: BUILD_BUG failed
>      _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
>                                          ^
>    include/linux/compiler.h:160:16: note: in definition of macro '__trace_if'
>       ______r = !!(cond);     \
>                    ^~~~
> >> mm/memory_hotplug.c:1575:2: note: in expansion of macro 'if'
>      if (new_page && order == HPAGE_PMD_ORDER)
>      ^~
>    include/linux/compiler.h:506:2: note: in expansion of macro '__compiletime_assert'
>      __compiletime_assert(condition, msg, prefix, suffix)
>      ^~~~~~~~~~~~~~~~~~~~
>    include/linux/compiler.h:518:2: note: in expansion of macro '_compiletime_assert'
>      _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
>      ^~~~~~~~~~~~~~~~~~~
>    include/linux/bug.h:54:37: note: in expansion of macro 'compiletime_assert'
>     #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
>                                         ^~~~~~~~~~~~~~~~~~
>    include/linux/bug.h:88:21: note: in expansion of macro 'BUILD_BUG_ON_MSG'
>     #define BUILD_BUG() BUILD_BUG_ON_MSG(1, "BUILD_BUG failed")
>                         ^~~~~~~~~~~~~~~~
>    include/linux/huge_mm.h:181:28: note: in expansion of macro 'BUILD_BUG'
>     #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
>                                ^~~~~~~~~
>    include/linux/huge_mm.h:56:26: note: in expansion of macro 'HPAGE_PMD_SHIFT'
>     #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
>                              ^~~~~~~~~~~~~~~
>    mm/memory_hotplug.c:1575:27: note: in expansion of macro 'HPAGE_PMD_ORDER'
>      if (new_page && order == HPAGE_PMD_ORDER)
>                               ^~~~~~~~~~~~~~~

HPAGE_PMD_ORDER is not available in non-thp code now, so let's add
a simple wrapper to access it in generic code.


diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 3c252cdef587..b75a9a1bbf3e 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -148,6 +148,12 @@ static inline int hpage_nr_pages(struct page *page)
 		return HPAGE_PMD_NR;
 	return 1;
 }
+static inline int hpage_order(struct page *page)
+{
+	if (unlikely(PageTransHuge(page)))
+		return HPAGE_PMD_ORDER;
+	return 0;
+}
 
 extern int do_huge_pmd_numa_page(struct fault_env *fe, pmd_t orig_pmd);
 
@@ -183,6 +189,7 @@ static inline bool thp_migration_supported(void)
 #define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
 
 #define hpage_nr_pages(x) 1
+#define hpage_order(x) 0
 
 #define transparent_hugepage_enabled(__vma) 0
 
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index a9c3fe1b55ea..d612a75ceec4 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1555,7 +1555,7 @@ static struct page *new_node_page(struct page *page, unsigned long private,
 					next_node_in(nid, nmask));
 
 	if (thp_migration_supported() && PageTransHuge(page)) {
-		order = HPAGE_PMD_ORDER;
+		order = hpage_order(page);
 		gfp_mask |= GFP_TRANSHUGE;
 	}
 
@@ -1572,7 +1572,7 @@ static struct page *new_node_page(struct page *page, unsigned long private,
 		new_page = __alloc_pages(gfp_mask, order,
 					node_zonelist(nid, gfp_mask));
 
-	if (new_page && order == HPAGE_PMD_ORDER)
+	if (new_page && order == hpage_order(page))
 		prep_transhuge_page(new_page);
 
 	return new_page;
@@ -1606,7 +1606,7 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
 			continue;
 		} else if (thp_migration_supported() && PageTransHuge(page))
 			pfn = page_to_pfn(compound_head(page))
-				+ HPAGE_PMD_NR - 1;
+				+ hpage_nr_pages(page) - 1;
 
 		if (!get_page_unless_zero(page))
 			continue;

These changes are applied in the next version.

Thanks,
Naoya Horiguchi

> 
> vim +/if +1575 mm/memory_hotplug.c
> 
>   1559			gfp_mask |= GFP_TRANSHUGE;
>   1560		}
>   1561	
>   1562		node_clear(nid, nmask);
>   1563	
>   1564		if (PageHighMem(page)
>   1565		    || (zone_idx(page_zone(page)) == ZONE_MOVABLE))
>   1566			gfp_mask |= __GFP_HIGHMEM;
>   1567	
>   1568		if (!nodes_empty(nmask))
>   1569			new_page = __alloc_pages_nodemask(gfp_mask, order,
>   1570						node_zonelist(nid, gfp_mask), &nmask);
>   1571		if (!new_page)
>   1572			new_page = __alloc_pages(gfp_mask, order,
>   1573						node_zonelist(nid, gfp_mask));
>   1574	
> > 1575		if (new_page && order == HPAGE_PMD_ORDER)
>   1576			prep_transhuge_page(new_page);
>   1577	
>   1578		return new_page;
>   1579	}
>   1580	
>   1581	#define NR_OFFLINE_AT_ONCE_PAGES	(256)
>   1582	static int
>   1583	do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
> 
> ---
> 0-DAY kernel test infrastructure                Open Source Technology Center
> https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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