| Message ID | 160461461867.1505359.5301571728749534585.stgit@dwillia2-desk3.amr.corp.intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v4] mm: Fix phys_to_target_node() and memory_add_physaddr_to_nid() exports | expand |
Hi Dan, On Thu, 05 Nov 2020 14:20:45 -0800 Dan Williams <dan.j.williams@intel.com> wrote: > > 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. > > Reported-by: Randy Dunlap <rdunlap@infradead.org> > Tested-by: Randy Dunlap <rdunlap@infradead.org> > Reported-by: Thomas Gleixner <tglx@linutronix.de> > Tested-by: Thomas Gleixner <tglx@linutronix.de> > Reviewed-by: Thomas Gleixner <tglx@linutronix.de> > Reported-by: kernel test robot <lkp@intel.com> > Reported-by: Christoph Hellwig <hch@infradead.org> > Reviewed-by: Christoph Hellwig <hch@lst.de> > Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> > Fixes: a035b6bf863e ("mm/memory_hotplug: introduce default phys_to_target_node() implementation") > Cc: Joao Martins <joao.m.martins@oracle.com> > Cc: Andrew Morton <akpm@linux-foundation.org> > Cc: x86@kernel.org > 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> > Signed-off-by: Dan Williams <dan.j.williams@intel.com> > --- > Changes since v3 [1]: > - (Stephen) PowerPC header include dependencies make it difficult to > include asm/sparsemem.h in linux/numa.h due to missing definition of > pgprot. Move the declaration of create_section_mapping() to > asm/mmzone.h. This has received a build success notification from the > kbuild-robot over 159 configs. I replaced the previous version in linux-next with this today. Thanks.
diff --git a/arch/ia64/include/asm/sparsemem.h b/arch/ia64/include/asm/sparsemem.h index 336d0570e1fa..dd8c166ffd7b 100644 --- a/arch/ia64/include/asm/sparsemem.h +++ b/arch/ia64/include/asm/sparsemem.h @@ -18,4 +18,10 @@ #endif #endif /* CONFIG_SPARSEMEM */ + +#ifdef CONFIG_MEMORY_HOTPLUG +int memory_add_physaddr_to_nid(u64 addr); +#define memory_add_physaddr_to_nid memory_add_physaddr_to_nid +#endif + #endif /* _ASM_IA64_SPARSEMEM_H */ diff --git a/arch/powerpc/include/asm/mmzone.h b/arch/powerpc/include/asm/mmzone.h index 91c69ff53a8a..177fd18caf83 100644 --- a/arch/powerpc/include/asm/mmzone.h +++ b/arch/powerpc/include/asm/mmzone.h @@ -33,6 +33,8 @@ extern struct pglist_data *node_data[]; extern int numa_cpu_lookup_table[]; extern cpumask_var_t node_to_cpumask_map[]; #ifdef CONFIG_MEMORY_HOTPLUG +extern int create_section_mapping(unsigned long start, unsigned long end, + int nid, pgprot_t prot); extern unsigned long max_pfn; u64 memory_hotplug_max(void); #else diff --git a/arch/powerpc/include/asm/sparsemem.h b/arch/powerpc/include/asm/sparsemem.h index 1e6fa371cc38..d072866842e4 100644 --- a/arch/powerpc/include/asm/sparsemem.h +++ b/arch/powerpc/include/asm/sparsemem.h @@ -13,9 +13,9 @@ #endif /* CONFIG_SPARSEMEM */ #ifdef CONFIG_MEMORY_HOTPLUG -extern int create_section_mapping(unsigned long start, unsigned long end, - int nid, pgprot_t prot); extern int remove_section_mapping(unsigned long start, unsigned long end); +extern int memory_add_physaddr_to_nid(u64 start); +#define memory_add_physaddr_to_nid memory_add_physaddr_to_nid #ifdef CONFIG_NUMA extern int hot_add_scn_to_nid(unsigned long scn_addr); @@ -26,6 +26,5 @@ static inline int hot_add_scn_to_nid(unsigned long scn_addr) } #endif /* CONFIG_NUMA */ #endif /* CONFIG_MEMORY_HOTPLUG */ - #endif /* __KERNEL__ */ #endif /* _ASM_POWERPC_SPARSEMEM_H */ diff --git a/arch/x86/include/asm/sparsemem.h b/arch/x86/include/asm/sparsemem.h index 6bfc878f6771..6a9ccc1b2be5 100644 --- a/arch/x86/include/asm/sparsemem.h +++ b/arch/x86/include/asm/sparsemem.h @@ -28,4 +28,14 @@ #endif #endif /* CONFIG_SPARSEMEM */ + +#ifndef __ASSEMBLY__ +#ifdef CONFIG_NUMA_KEEP_MEMINFO +extern int phys_to_target_node(phys_addr_t start); +#define phys_to_target_node phys_to_target_node +extern int memory_add_physaddr_to_nid(u64 start); +#define memory_add_physaddr_to_nid memory_add_physaddr_to_nid +#endif +#endif /* __ASSEMBLY__ */ + #endif /* _ASM_X86_SPARSEMEM_H */ diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c index 44148691d78b..5eb4dc2b97da 100644 --- a/arch/x86/mm/numa.c +++ b/arch/x86/mm/numa.c @@ -938,6 +938,7 @@ int phys_to_target_node(phys_addr_t start) return meminfo_to_nid(&numa_reserved_meminfo, start); } +EXPORT_SYMBOL_GPL(phys_to_target_node); int memory_add_physaddr_to_nid(u64 start) { @@ -947,4 +948,5 @@ 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 diff --git a/drivers/dax/Kconfig b/drivers/dax/Kconfig index 567428e10b7b..d2834c2cfa10 100644 --- a/drivers/dax/Kconfig +++ b/drivers/dax/Kconfig @@ -50,7 +50,6 @@ config DEV_DAX_HMEM Say M if unsure. config DEV_DAX_HMEM_DEVICES - depends on NUMA_KEEP_MEMINFO # for phys_to_target_node() depends on DEV_DAX_HMEM && DAX=y def_bool y diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h index d65c6fdc5cfc..551093b74596 100644 --- a/include/linux/memory_hotplug.h +++ b/include/linux/memory_hotplug.h @@ -281,20 +281,6 @@ static inline bool movable_node_is_enabled(void) } #endif /* ! CONFIG_MEMORY_HOTPLUG */ -#ifdef CONFIG_NUMA -extern int memory_add_physaddr_to_nid(u64 start); -extern int phys_to_target_node(u64 start); -#else -static inline int memory_add_physaddr_to_nid(u64 start) -{ - return 0; -} -static inline int phys_to_target_node(u64 start) -{ - return 0; -} -#endif - #if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT) /* * pgdat resizing functions diff --git a/include/linux/numa.h b/include/linux/numa.h index 8cb33ccfb671..cb44cfe2b725 100644 --- a/include/linux/numa.h +++ b/include/linux/numa.h @@ -21,13 +21,41 @@ #endif #ifdef CONFIG_NUMA +#include <linux/printk.h> +#include <asm/sparsemem.h> + /* Generic implementation available */ int numa_map_to_online_node(int node); -#else + +#ifndef memory_add_physaddr_to_nid +static inline int memory_add_physaddr_to_nid(u64 start) +{ + pr_info_once("Unknown online node for memory at 0x%llx, assuming node 0\n", + start); + return 0; +} +#endif +#ifndef phys_to_target_node +static inline int phys_to_target_node(u64 start) +{ + pr_info_once("Unknown target node for memory at 0x%llx, assuming node 0\n", + start); + return 0; +} +#endif +#else /* !CONFIG_NUMA */ static inline int numa_map_to_online_node(int node) { return NUMA_NO_NODE; } +static inline int memory_add_physaddr_to_nid(u64 start) +{ + return 0; +} +static inline int phys_to_target_node(u64 start) +{ + return 0; +} #endif #endif /* _LINUX_NUMA_H */ diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index b44d4c7ba73b..63b2e46b6555 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -350,24 +350,6 @@ 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 online node for memory at 0x%llx, assuming node 0\n", - start); - return 0; -} -EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); - -int __weak phys_to_target_node(u64 start) -{ - pr_info_once("Unknown target node for memory at 0x%llx, assuming node 0\n", - start); - return 0; -} -EXPORT_SYMBOL_GPL(phys_to_target_node); -#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,