Messages in this thread Patch in this message | | | Subject | [PATCH v3 4/6] x86/mm: Introduce CONFIG_KEEP_NUMA | From | Dan Williams <> | Date | Mon, 20 Jan 2020 11:03:11 -0800 |
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Currently x86 numa_meminfo is marked __initdata in the CONFIG_MEMORY_HOTPLUG=n case. In support of a new facility to allow drivers to map reserved memory to a 'target_node' (phys_to_target_node()), add support for removing the __initdata designation for those users. Both memory hotplug and phys_to_target_node() users select CONFIG_KEEP_NUMA to tell the arch to maintain its physical address to numa mapping infrastructure post init.
Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Borislav Petkov <bp@alien8.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: <x86@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: David Hildenbrand <david@redhat.com> Cc: Michal Hocko <mhocko@suse.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> --- arch/x86/mm/numa.c | 6 +----- include/linux/numa.h | 6 ++++++ mm/Kconfig | 5 +++++ 3 files changed, 12 insertions(+), 5 deletions(-)
diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c index 99f7a68738f0..5289d9d6799a 100644 --- a/arch/x86/mm/numa.c +++ b/arch/x86/mm/numa.c @@ -25,11 +25,7 @@ nodemask_t numa_nodes_parsed __initdata; struct pglist_data *node_data[MAX_NUMNODES] __read_mostly; EXPORT_SYMBOL(node_data); -static struct numa_meminfo numa_meminfo -#ifndef CONFIG_MEMORY_HOTPLUG -__initdata -#endif -; +static struct numa_meminfo numa_meminfo __initdata_numa; static int numa_distance_cnt; static u8 *numa_distance; diff --git a/include/linux/numa.h b/include/linux/numa.h index 20f4e44b186c..c005ed6b807b 100644 --- a/include/linux/numa.h +++ b/include/linux/numa.h @@ -13,6 +13,12 @@ #define NUMA_NO_NODE (-1) +#ifdef CONFIG_KEEP_NUMA +#define __initdata_numa +#else +#define __initdata_numa __initdata +#endif + #ifdef CONFIG_NUMA int numa_map_to_online_node(int node); #else diff --git a/mm/Kconfig b/mm/Kconfig index ab80933be65f..001f1185eadf 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -139,6 +139,10 @@ config HAVE_FAST_GUP config ARCH_KEEP_MEMBLOCK bool +# Keep arch numa mapping infrastructure post-init. +config KEEP_NUMA + bool + config MEMORY_ISOLATION bool @@ -154,6 +158,7 @@ config MEMORY_HOTPLUG bool "Allow for memory hot-add" depends on SPARSEMEM || X86_64_ACPI_NUMA depends on ARCH_ENABLE_MEMORY_HOTPLUG + select KEEP_NUMA if NUMA config MEMORY_HOTPLUG_SPARSE def_bool y
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