[PATCH v3 kernel 3/7] mm: add a function to get the max pfn
From: Liang Li <hidden>
Date: 2016-08-08 06:43:25
Also in:
kvm, lkml, qemu-devel
Subsystem:
memory management, memory management - core, memory management - page allocator, the rest · Maintainers:
Andrew Morton, David Hildenbrand, Vlastimil Babka, Linus Torvalds
Expose the function to get the max pfn, so it can be used in the virtio-balloon device driver. Simply include the 'linux/bootmem.h' is not enough, if the device driver is built to a module, directly refer the max_pfn lead to build failed. Signed-off-by: Liang Li <redacted> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Mel Gorman <redacted> Cc: Michael S. Tsirkin <mst@redhat.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Cornelia Huck <redacted> Cc: Amit Shah <redacted> Cc: Dave Hansen <redacted> --- include/linux/mm.h | 1 + mm/page_alloc.c | 10 ++++++++++ 2 files changed, 11 insertions(+)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 08ed53e..5873057 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h@@ -1788,6 +1788,7 @@ extern void free_area_init(unsigned long * zones_size); extern void free_area_init_node(int nid, unsigned long * zones_size, unsigned long zone_start_pfn, unsigned long *zholes_size); extern void free_initmem(void); +extern unsigned long get_max_pfn(void); /* * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index fb975ce..3373704 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c@@ -4391,6 +4391,16 @@ void show_free_areas(unsigned int filter) show_swap_cache_info(); } +/* + * The max_pfn can change because of memory hot plug, so it's only good + * as a hint. e.g. for sizing data structures. + */ +unsigned long get_max_pfn(void) +{ + return max_pfn; +} +EXPORT_SYMBOL(get_max_pfn); + static void zoneref_set_zone(struct zone *zone, struct zoneref *zoneref) { zoneref->zone = zone;
--
1.8.3.1
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