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authorMichal Hocko <mhocko@suse.com>2017-07-06 15:41:02 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-07-06 16:24:35 -0700
commitf70029bbaacbfa8f082d2b4988717cba4e269f17 (patch)
treeda4860c5227a317637194b6ca9ee4c6becfddb53 /mm
parent57c0a17238e22395428248c53f8e390c051c88b8 (diff)
downloadlinux-f70029bbaacbfa8f082d2b4988717cba4e269f17.tar.bz2
mm, memory_hotplug: drop CONFIG_MOVABLE_NODE
Commit 20b2f52b73fe ("numa: add CONFIG_MOVABLE_NODE for movable-dedicated node") has introduced CONFIG_MOVABLE_NODE without a good explanation on why it is actually useful. It makes a lot of sense to make movable node semantic opt in but we already have that because the feature has to be explicitly enabled on the kernel command line. A config option on top only makes the configuration space larger without a good reason. It also adds an additional ifdefery that pollutes the code. Just drop the config option and make it de-facto always enabled. This shouldn't introduce any change to the semantic. Link: http://lkml.kernel.org/r/20170529114141.536-3-mhocko@kernel.org Signed-off-by: Michal Hocko <mhocko@suse.com> Acked-by: Reza Arbab <arbab@linux.vnet.ibm.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Mel Gorman <mgorman@suse.de> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Jerome Glisse <jglisse@redhat.com> Cc: Yasuaki Ishimatsu <yasu.isimatu@gmail.com> Cc: Xishi Qiu <qiuxishi@huawei.com> Cc: Kani Toshimitsu <toshi.kani@hpe.com> Cc: Chen Yucong <slaoub@gmail.com> Cc: Joonsoo Kim <js1304@gmail.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: David Rientjes <rientjes@google.com> Cc: Daniel Kiper <daniel.kiper@oracle.com> Cc: Igor Mammedov <imammedo@redhat.com> Cc: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/Kconfig26
-rw-r--r--mm/memblock.c2
-rw-r--r--mm/memory_hotplug.c4
-rw-r--r--mm/page_alloc.c2
4 files changed, 0 insertions, 34 deletions
diff --git a/mm/Kconfig b/mm/Kconfig
index 9870baafb096..857f6ef368d4 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -149,32 +149,6 @@ config NO_BOOTMEM
config MEMORY_ISOLATION
bool
-config MOVABLE_NODE
- bool "Enable to assign a node which has only movable memory"
- depends on HAVE_MEMBLOCK
- depends on NO_BOOTMEM
- depends on X86_64 || OF_EARLY_FLATTREE || MEMORY_HOTPLUG
- depends on NUMA
- default n
- help
- Allow a node to have only movable memory. Pages used by the kernel,
- such as direct mapping pages cannot be migrated. So the corresponding
- memory device cannot be hotplugged. This option allows the following
- two things:
- - When the system is booting, node full of hotpluggable memory can
- be arranged to have only movable memory so that the whole node can
- be hot-removed. (need movable_node boot option specified).
- - After the system is up, the option allows users to online all the
- memory of a node as movable memory so that the whole node can be
- hot-removed.
-
- Users who don't use the memory hotplug feature are fine with this
- option on since they don't specify movable_node boot option or they
- don't online memory as movable.
-
- Say Y here if you want to hotplug a whole node.
- Say N here if you want kernel to use memory on all nodes evenly.
-
#
# Only be set on architectures that have completely implemented memory hotplug
# feature. If you are not sure, don't touch it.
diff --git a/mm/memblock.c b/mm/memblock.c
index 7b8a5db76a2f..41eaeebb03dc 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -54,9 +54,7 @@ struct memblock memblock __initdata_memblock = {
};
int memblock_debug __initdata_memblock;
-#ifdef CONFIG_MOVABLE_NODE
bool movable_node_enabled __initdata_memblock = false;
-#endif
static bool system_has_some_mirror __initdata_memblock = false;
static int memblock_can_resize __initdata_memblock;
static int memblock_memory_in_slab __initdata_memblock = 0;
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 937319899e61..0dc8cf0a59d7 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1572,11 +1572,7 @@ check_pages_isolated(unsigned long start_pfn, unsigned long end_pfn)
static int __init cmdline_parse_movable_node(char *p)
{
-#ifdef CONFIG_MOVABLE_NODE
movable_node_enabled = true;
-#else
- pr_warn("movable_node option not supported\n");
-#endif
return 0;
}
early_param("movable_node", cmdline_parse_movable_node);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index a35add8d7c0b..bd65b60939b6 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -113,9 +113,7 @@ nodemask_t node_states[NR_NODE_STATES] __read_mostly = {
#ifdef CONFIG_HIGHMEM
[N_HIGH_MEMORY] = { { [0] = 1UL } },
#endif
-#ifdef CONFIG_MOVABLE_NODE
[N_MEMORY] = { { [0] = 1UL } },
-#endif
[N_CPU] = { { [0] = 1UL } },
#endif /* NUMA */
};