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mm/memory_hotplug: introduce default dummy memory_add_physaddr_to_nid()

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This is to introduce a general dummy helper.  memory_add_physaddr_to_nid()
is a fallback option to get the nid in case NUMA_NO_NID is detected.

After this patch, arm64/sh/s390 can simply use the general dummy version.
PowerPC/x86/ia64 will still use their specific version.

This is the preparation to set a fallback value for dev_dax->target_node.

Signed-off-by: Jia He <justin.he@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Rich Felker <dalias@libc.org>
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: Vishal Verma <vishal.l.verma@intel.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Chuhong Yuan <hslester96@gmail.com>
Cc: Mike Rapoport <rppt@linux.ibm.com>
Cc: Logan Gunthorpe <logang@deltatee.com>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Jonathan Cameron <Jonathan.Cameron@Huawei.com>
Cc: Kaly Xin <Kaly.Xin@arm.com>
Link: http://lkml.kernel.org/r/20200710031619.18762-2-justin.he@arm.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jia He 2020-08-11 18:32:16 -07:00 committed by Linus Torvalds
parent fe124c95df
commit d622ecec5f
5 changed files with 10 additions and 22 deletions
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10
arch/arm64/mm/numa.c
View File

@ -461,13 +461,3 @@ void __init arm64_numa_init(void)
numa_init(dummy_numa_init);
}
/*
* We hope that we will be hotplugging memory on nodes we already know about,
* such that acpi_get_node() succeeds and we never fall back to this...
*/
int memory_add_physaddr_to_nid(u64 addr)
{
pr_warn("Unknown node for memory at 0x%llx, assuming node 0\n", addr);
return 0;
}

2
arch/ia64/mm/numa.c
View File

@ -106,7 +106,5 @@ int memory_add_physaddr_to_nid(u64 addr)
return 0;
return nid;
}
EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
#endif
#endif

9
arch/sh/mm/init.c
View File

@ -425,15 +425,6 @@ int arch_add_memory(int nid, u64 start, u64 size,
return ret;
}
#ifdef CONFIG_NUMA
int memory_add_physaddr_to_nid(u64 addr)
{
/* Node 0 for now.. */
return 0;
}
EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
#endif
void arch_remove_memory(int nid, u64 start, u64 size,
struct vmem_altmap *altmap)
{

1
arch/x86/mm/numa.c
View File

@ -929,5 +929,4 @@ int memory_add_physaddr_to_nid(u64 start)
nid = numa_meminfo.blk[0].nid;
return nid;
}
EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
#endif

10
mm/memory_hotplug.c
View File

@ -350,6 +350,16 @@ int __ref __add_pages(int nid, unsigned long pfn, unsigned long nr_pages,
return err;
}
#ifdef CONFIG_NUMA
int __weak memory_add_physaddr_to_nid(u64 start)
{
pr_info_once("Unknown target node for memory at 0x%llx, assuming node 0\n",
start);
return 0;
}
EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
#endif
/* find the smallest valid pfn in the range [start_pfn, end_pfn) */
static unsigned long find_smallest_section_pfn(int nid, struct zone *zone,
unsigned long start_pfn,