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a927bd6ba9
The core-mm has a default __weak implementation of phys_to_target_node() to mirror the weak definition of memory_add_physaddr_to_nid(). That symbol is exported for modules. However, while the export in mm/memory_hotplug.c exported the symbol in the configuration cases of: CONFIG_NUMA_KEEP_MEMINFO=y CONFIG_MEMORY_HOTPLUG=y ...and: CONFIG_NUMA_KEEP_MEMINFO=n CONFIG_MEMORY_HOTPLUG=y ...it failed to export the symbol in the case of: CONFIG_NUMA_KEEP_MEMINFO=y CONFIG_MEMORY_HOTPLUG=n Not only is that broken, but Christoph points out that the kernel should not be exporting any __weak symbol, which means that memory_add_physaddr_to_nid() example that phys_to_target_node() copied is broken too. Rework the definition of phys_to_target_node() and memory_add_physaddr_to_nid() to not require weak symbols. Move to the common arch override design-pattern of an asm header defining a symbol to replace the default implementation. The only common header that all memory_add_physaddr_to_nid() producing architectures implement is asm/sparsemem.h. In fact, powerpc already defines its memory_add_physaddr_to_nid() helper in sparsemem.h. Double-down on that observation and define phys_to_target_node() where necessary in asm/sparsemem.h. An alternate consideration that was discarded was to put this override in asm/numa.h, but that entangles with the definition of MAX_NUMNODES relative to the inclusion of linux/nodemask.h, and requires powerpc to grow a new header. The dependency on NUMA_KEEP_MEMINFO for DEV_DAX_HMEM_DEVICES is invalid now that the symbol is properly exported / stubbed in all combinations of CONFIG_NUMA_KEEP_MEMINFO and CONFIG_MEMORY_HOTPLUG. [dan.j.williams@intel.com: v4] Link: https://lkml.kernel.org/r/160461461867.1505359.5301571728749534585.stgit@dwillia2-desk3.amr.corp.intel.com [dan.j.williams@intel.com: powerpc: fix create_section_mapping compile warning] Link: https://lkml.kernel.org/r/160558386174.2948926.2740149041249041764.stgit@dwillia2-desk3.amr.corp.intel.com Fixes: a035b6bf863e ("mm/memory_hotplug: introduce default phys_to_target_node() implementation") Reported-by: Randy Dunlap <rdunlap@infradead.org> Reported-by: Thomas Gleixner <tglx@linutronix.de> Reported-by: kernel test robot <lkp@intel.com> Reported-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Tested-by: Randy Dunlap <rdunlap@infradead.org> Tested-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: Joao Martins <joao.m.martins@oracle.com> Cc: Tony Luck <tony.luck@intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Vishal Verma <vishal.l.verma@intel.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Link: https://lkml.kernel.org/r/160447639846.1133764.7044090803980177548.stgit@dwillia2-desk3.amr.corp.intel.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
62 lines
1.2 KiB
C
62 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_NUMA_H
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#define _LINUX_NUMA_H
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#include <linux/types.h>
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#ifdef CONFIG_NODES_SHIFT
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#define NODES_SHIFT CONFIG_NODES_SHIFT
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#else
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#define NODES_SHIFT 0
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#endif
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#define MAX_NUMNODES (1 << NODES_SHIFT)
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#define NUMA_NO_NODE (-1)
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/* optionally keep NUMA memory info available post init */
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#ifdef CONFIG_NUMA_KEEP_MEMINFO
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#define __initdata_or_meminfo
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#else
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#define __initdata_or_meminfo __initdata
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#endif
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#ifdef CONFIG_NUMA
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#include <linux/printk.h>
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#include <asm/sparsemem.h>
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/* Generic implementation available */
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int numa_map_to_online_node(int node);
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#ifndef memory_add_physaddr_to_nid
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static inline int memory_add_physaddr_to_nid(u64 start)
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{
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pr_info_once("Unknown online node for memory at 0x%llx, assuming node 0\n",
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start);
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return 0;
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}
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#endif
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#ifndef phys_to_target_node
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static inline int phys_to_target_node(u64 start)
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{
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pr_info_once("Unknown target node for memory at 0x%llx, assuming node 0\n",
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start);
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return 0;
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}
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#endif
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#else /* !CONFIG_NUMA */
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static inline int numa_map_to_online_node(int node)
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{
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return NUMA_NO_NODE;
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}
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static inline int memory_add_physaddr_to_nid(u64 start)
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{
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return 0;
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}
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static inline int phys_to_target_node(u64 start)
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{
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return 0;
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}
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#endif
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#endif /* _LINUX_NUMA_H */
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