[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [RESEND PATCH v3 kernel 3/7] mm: add a function to get the
From: |
Liang Li |
Subject: |
[Qemu-devel] [RESEND PATCH v3 kernel 3/7] mm: add a function to get the max pfn |
Date: |
Fri, 21 Oct 2016 14:24:36 +0800 |
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 <address@hidden>
Cc: Andrew Morton <address@hidden>
Cc: Mel Gorman <address@hidden>
Cc: Michael S. Tsirkin <address@hidden>
Cc: Paolo Bonzini <address@hidden>
Cc: Cornelia Huck <address@hidden>
Cc: Amit Shah <address@hidden>
---
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 ffbd729..2a89da0e 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1776,6 +1776,7 @@ static inline spinlock_t *pmd_lock(struct mm_struct *mm,
pmd_t *pmd)
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 2b3bf67..e5f63a9 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4426,6 +4426,16 @@ 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
- [Qemu-devel] [RESEND PATCH v3 kernel 0/7] Extend virtio-balloon for fast (de)inflating & fast live migration, Liang Li, 2016/10/21
- [Qemu-devel] [RESEND PATCH v3 kernel 1/7] virtio-balloon: rework deflate to add page to a list, Liang Li, 2016/10/21
- [Qemu-devel] [RESEND PATCH v3 kernel 2/7] virtio-balloon: define new feature bit and page bitmap head, Liang Li, 2016/10/21
- [Qemu-devel] [RESEND PATCH v3 kernel 3/7] mm: add a function to get the max pfn,
Liang Li <=
- [Qemu-devel] [RESEND PATCH v3 kernel 4/7] virtio-balloon: speed up inflate/deflate process, Liang Li, 2016/10/21
- [Qemu-devel] [RESEND PATCH v3 kernel 6/7] virtio-balloon: define feature bit and head for misc virt queue, Liang Li, 2016/10/21
- [Qemu-devel] [RESEND PATCH v3 kernel 5/7] mm: add the related functions to get unused page, Liang Li, 2016/10/21
- [Qemu-devel] [RESEND PATCH v3 kernel 7/7] virtio-balloon: tell host vm's unused page info, Liang Li, 2016/10/21
- Re: [Qemu-devel] [RESEND PATCH v3 kernel 0/7] Extend virtio-balloon for fast (de)inflating & fast live migration, Dave Hansen, 2016/10/21