fc44f7f923
During memory hotplugging the probe routine will leave struct pages uninitialized, the same as it is currently done during boot. Therefore, we do not want to access the inside of struct pages before __init_single_page() is called during onlining. Because during hotplug we know that pages in one memory block belong to the same numa node, we can skip the checking. We should keep checking for the boot case. [pasha.tatashin@oracle.com: s/register_new_memory()/hotplug_memory_register()] Link: http://lkml.kernel.org/r/20180228030308.1116-6-pasha.tatashin@oracle.com Link: http://lkml.kernel.org/r/20180215165920.8570-6-pasha.tatashin@oracle.com Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com> Acked-by: Michal Hocko <mhocko@suse.com> Reviewed-by: Ingo Molnar <mingo@kernel.org> Cc: Baoquan He <bhe@redhat.com> Cc: Bharata B Rao <bharata@linux.vnet.ibm.com> Cc: Daniel Jordan <daniel.m.jordan@oracle.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Steven Sistare <steven.sistare@oracle.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
119 lines
3 KiB
C
119 lines
3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* include/linux/node.h - generic node definition
|
|
*
|
|
* This is mainly for topological representation. We define the
|
|
* basic 'struct node' here, which can be embedded in per-arch
|
|
* definitions of processors.
|
|
*
|
|
* Basic handling of the devices is done in drivers/base/node.c
|
|
* and system devices are handled in drivers/base/sys.c.
|
|
*
|
|
* Nodes are exported via driverfs in the class/node/devices/
|
|
* directory.
|
|
*/
|
|
#ifndef _LINUX_NODE_H_
|
|
#define _LINUX_NODE_H_
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/cpumask.h>
|
|
#include <linux/workqueue.h>
|
|
|
|
struct node {
|
|
struct device dev;
|
|
|
|
#if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS)
|
|
struct work_struct node_work;
|
|
#endif
|
|
};
|
|
|
|
struct memory_block;
|
|
extern struct node *node_devices[];
|
|
typedef void (*node_registration_func_t)(struct node *);
|
|
|
|
#if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_NUMA)
|
|
extern int link_mem_sections(int nid, unsigned long start_pfn, unsigned long nr_pages);
|
|
#else
|
|
static inline int link_mem_sections(int nid, unsigned long start_pfn, unsigned long nr_pages)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
extern void unregister_node(struct node *node);
|
|
#ifdef CONFIG_NUMA
|
|
/* Core of the node registration - only memory hotplug should use this */
|
|
extern int __register_one_node(int nid);
|
|
|
|
/* Registers an online node */
|
|
static inline int register_one_node(int nid)
|
|
{
|
|
int error = 0;
|
|
|
|
if (node_online(nid)) {
|
|
struct pglist_data *pgdat = NODE_DATA(nid);
|
|
|
|
error = __register_one_node(nid);
|
|
if (error)
|
|
return error;
|
|
/* link memory sections under this node */
|
|
error = link_mem_sections(nid, pgdat->node_start_pfn, pgdat->node_spanned_pages);
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
extern void unregister_one_node(int nid);
|
|
extern int register_cpu_under_node(unsigned int cpu, unsigned int nid);
|
|
extern int unregister_cpu_under_node(unsigned int cpu, unsigned int nid);
|
|
extern int register_mem_sect_under_node(struct memory_block *mem_blk,
|
|
int nid, bool check_nid);
|
|
extern int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
|
|
unsigned long phys_index);
|
|
|
|
#ifdef CONFIG_HUGETLBFS
|
|
extern void register_hugetlbfs_with_node(node_registration_func_t doregister,
|
|
node_registration_func_t unregister);
|
|
#endif
|
|
#else
|
|
static inline int __register_one_node(int nid)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline int register_one_node(int nid)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline int unregister_one_node(int nid)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline int register_cpu_under_node(unsigned int cpu, unsigned int nid)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline int register_mem_sect_under_node(struct memory_block *mem_blk,
|
|
int nid, bool check_nid)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
|
|
unsigned long phys_index)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void register_hugetlbfs_with_node(node_registration_func_t reg,
|
|
node_registration_func_t unreg)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
#define to_node(device) container_of(device, struct node, dev)
|
|
|
|
#endif /* _LINUX_NODE_H_ */
|