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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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d0c4f57027
Impact: fix new breakages introduced by previous fix
Commit c132937556 tried to clean up
bootmem arch wrapper but it wasn't quite correct. Before the commit,
the followings were broken.
* Low level interface functions prefixed with __ ignored arch
preference.
* reserve_bootmem(...) can't be mapped into
reserve_bootmem_node(NODE_DATA(0)->bdata, ...) because the node is
not preference here. The region specified MUST fall into the
specified region; otherwise, it will panic.
After the commit,
* If allocation fails for the arch preferred node, it should fallback
to whatever is available. Instead, it simply failed allocation.
There are too many internal details to allow generic wrapping and
still keep things simple for archs. Plus, all that arch wants is a
way to prefer certain node over another.
This patch drops the generic wrapping around alloc_bootmem_core() and
add alloc_bootmem_core() instead. If necessary, arch can define
bootmem_arch_referred_node() macro or function which takes all
allocation information and returns the preferred node. bootmem
generic code will always try the preferred node first and then
fallback to other nodes as usual.
Breakages noted and changes reviewed by Johannes Weiner.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
100 lines
2.1 KiB
C
100 lines
2.1 KiB
C
/*
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* Written by Pat Gaughen (gone@us.ibm.com) Mar 2002
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*
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*/
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#ifndef _ASM_X86_MMZONE_32_H
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#define _ASM_X86_MMZONE_32_H
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#include <asm/smp.h>
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#ifdef CONFIG_NUMA
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extern struct pglist_data *node_data[];
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#define NODE_DATA(nid) (node_data[nid])
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#include <asm/numaq.h>
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/* summit or generic arch */
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#include <asm/srat.h>
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extern int get_memcfg_numa_flat(void);
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/*
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* This allows any one NUMA architecture to be compiled
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* for, and still fall back to the flat function if it
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* fails.
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*/
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static inline void get_memcfg_numa(void)
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{
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if (get_memcfg_numaq())
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return;
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if (get_memcfg_from_srat())
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return;
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get_memcfg_numa_flat();
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}
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extern void resume_map_numa_kva(pgd_t *pgd);
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#else /* !CONFIG_NUMA */
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#define get_memcfg_numa get_memcfg_numa_flat
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static inline void resume_map_numa_kva(pgd_t *pgd) {}
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#endif /* CONFIG_NUMA */
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#ifdef CONFIG_DISCONTIGMEM
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/*
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* generic node memory support, the following assumptions apply:
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*
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* 1) memory comes in 64Mb contigious chunks which are either present or not
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* 2) we will not have more than 64Gb in total
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*
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* for now assume that 64Gb is max amount of RAM for whole system
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* 64Gb / 4096bytes/page = 16777216 pages
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*/
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#define MAX_NR_PAGES 16777216
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#define MAX_ELEMENTS 1024
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#define PAGES_PER_ELEMENT (MAX_NR_PAGES/MAX_ELEMENTS)
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extern s8 physnode_map[];
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static inline int pfn_to_nid(unsigned long pfn)
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{
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#ifdef CONFIG_NUMA
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return((int) physnode_map[(pfn) / PAGES_PER_ELEMENT]);
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#else
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return 0;
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#endif
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}
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/*
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* Following are macros that each numa implmentation must define.
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*/
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#define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn)
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#define node_end_pfn(nid) \
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({ \
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pg_data_t *__pgdat = NODE_DATA(nid); \
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__pgdat->node_start_pfn + __pgdat->node_spanned_pages; \
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})
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static inline int pfn_valid(int pfn)
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{
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int nid = pfn_to_nid(pfn);
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if (nid >= 0)
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return (pfn < node_end_pfn(nid));
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return 0;
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}
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#endif /* CONFIG_DISCONTIGMEM */
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#ifdef CONFIG_NEED_MULTIPLE_NODES
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/* always use node 0 for bootmem on this numa platform */
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#define bootmem_arch_preferred_node(__bdata, size, align, goal, limit) \
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(NODE_DATA(0)->bdata)
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#endif /* CONFIG_NEED_MULTIPLE_NODES */
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#endif /* _ASM_X86_MMZONE_32_H */
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