| Message ID | 1477031080-12616-4-git-send-email-liang.z.li@intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 10/20/2016 11:24 PM, Liang Li wrote: > 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. I'm not sure the rest of the set is worth reviewing. I think a lot of it will change pretty fundamentally once you have those improved data structures in place.
> On 10/20/2016 11:24 PM, Liang Li wrote: > > 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. > > I'm not sure the rest of the set is worth reviewing. I think a lot of it will > change pretty fundamentally once you have those improved data structures > in place. That's true. I will send out the v4 as soon as possible. Liang
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;
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 <liang.z.li@intel.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Michael S. Tsirkin <mst@redhat.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Cornelia Huck <cornelia.huck@de.ibm.com> Cc: Amit Shah <amit.shah@redhat.com> --- include/linux/mm.h | 1 + mm/page_alloc.c | 10 ++++++++++ 2 files changed, 11 insertions(+)