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authorMichal Hocko <mhocko@suse.com>2017-07-07 01:37:45 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2017-07-07 02:24:32 +0300
commit1b862aecfbd419cdc4553645bf86d07554279bed (patch)
treec219675bc522f504b83ffaa522eb2ed4292961b9 /mm/memory_hotplug.c
parentbfe63d3beabfac93521c8b7ccd40befd7a90148e (diff)
downloadlinux-1b862aecfbd419cdc4553645bf86d07554279bed.tar.xz
mm, memory_hotplug: get rid of is_zone_device_section
Device memory hotplug hooks into regular memory hotplug only half way. It needs memory sections to track struct pages but there is no need/desire to associate those sections with memory blocks and export them to the userspace via sysfs because they cannot be onlined anyway. This is currently expressed by for_device argument to arch_add_memory which then makes sure to associate the given memory range with ZONE_DEVICE. register_new_memory then relies on is_zone_device_section to distinguish special memory hotplug from the regular one. While this works now, later patches in this series want to move __add_zone outside of arch_add_memory path so we have to come up with something else. Add want_memblock down the __add_pages path and use it to control whether the section->memblock association should be done. arch_add_memory then just trivially want memblock for everything but for_device hotplug. remove_memory_section doesn't need is_zone_device_section either. We can simply skip all the memblock specific cleanup if there is no memblock for the given section. This shouldn't introduce any functional change. Link: http://lkml.kernel.org/r/20170515085827.16474-5-mhocko@kernel.org Signed-off-by: Michal Hocko <mhocko@suse.com> Tested-by: Dan Williams <dan.j.williams@intel.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Andi Kleen <ak@linux.intel.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Balbir Singh <bsingharora@gmail.com> Cc: Daniel Kiper <daniel.kiper@oracle.com> Cc: David Rientjes <rientjes@google.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Igor Mammedov <imammedo@redhat.com> Cc: Jerome Glisse <jglisse@redhat.com> Cc: Joonsoo Kim <js1304@gmail.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Reza Arbab <arbab@linux.vnet.ibm.com> Cc: Tobias Regnery <tobias.regnery@gmail.com> Cc: Toshi Kani <toshi.kani@hpe.com> Cc: Vitaly Kuznetsov <vkuznets@redhat.com> Cc: Xishi Qiu <qiuxishi@huawei.com> Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memory_hotplug.c')
-rw-r--r--mm/memory_hotplug.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 6b6362819be2..c0147d3024eb 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -494,7 +494,7 @@ static int __meminit __add_zone(struct zone *zone, unsigned long phys_start_pfn)
}
static int __meminit __add_section(int nid, struct zone *zone,
- unsigned long phys_start_pfn)
+ unsigned long phys_start_pfn, bool want_memblock)
{
int ret;
@@ -511,6 +511,9 @@ static int __meminit __add_section(int nid, struct zone *zone,
if (ret < 0)
return ret;
+ if (!want_memblock)
+ return 0;
+
return register_new_memory(nid, __pfn_to_section(phys_start_pfn));
}
@@ -521,7 +524,7 @@ static int __meminit __add_section(int nid, struct zone *zone,
* add the new pages.
*/
int __ref __add_pages(int nid, struct zone *zone, unsigned long phys_start_pfn,
- unsigned long nr_pages)
+ unsigned long nr_pages, bool want_memblock)
{
unsigned long i;
int err = 0;
@@ -549,7 +552,7 @@ int __ref __add_pages(int nid, struct zone *zone, unsigned long phys_start_pfn,
}
for (i = start_sec; i <= end_sec; i++) {
- err = __add_section(nid, zone, section_nr_to_pfn(i));
+ err = __add_section(nid, zone, section_nr_to_pfn(i), want_memblock);
/*
* EEXIST is finally dealt with by ioresource collision