Messages in this thread Patch in this message | | | Date | Mon, 22 Dec 2003 16:26:40 -0800 | From | "Martin J. Bligh" <> | Subject | Re: [TRIVIAL PATCH] Ensure pfn_to_nid() is always defined for i386 |
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> pfn_to_nid() is defined for *almost* all configurations for i386. > There is a small bug in that for CONFIG_X86_PC it is not. This > just sets up a generic definition so that this function is always > defined in a reasonable manner.
I'd prefer to fix the current ungodly mess in the current fashion ... I know it's longer, but I'd prefer to clean it up more if we're going to touch it. This has been sitting in my tree for a while, waiting for the code freeze to slush out a bit.
M.
diff -purN -X /home/mbligh/.diff.exclude 276-per_node_rss/include/asm-i386/mmzone.h 278-pfn_to_nid/include/asm-i386/mmzone.h --- 276-per_node_rss/include/asm-i386/mmzone.h 2003-10-01 11:48:22.000000000 -0700 +++ 278-pfn_to_nid/include/asm-i386/mmzone.h 2003-12-11 17:16:48.000000000 -0800 @@ -10,7 +10,49 @@ #ifdef CONFIG_DISCONTIGMEM +#ifdef CONFIG_NUMA + #ifdef CONFIG_X86_NUMAQ + #include <asm/numaq.h> + #else /* summit or generic arch */ + #include <asm/srat.h> + #endif +#else /* !CONFIG_NUMA */ + #define get_memcfg_numa get_memcfg_numa_flat + #define get_zholes_size(n) (0) +#endif /* CONFIG_NUMA */ + extern struct pglist_data *node_data[]; +#define NODE_DATA(nid) (node_data[nid]) + +/* + * generic node memory support, the following assumptions apply: + * + * 1) memory comes in 256Mb contigious chunks which are either present or not + * 2) we will not have more than 64Gb in total + * + * for now assume that 64Gb is max amount of RAM for whole system + * 64Gb / 4096bytes/page = 16777216 pages + */ +#define MAX_NR_PAGES 16777216 +#define MAX_ELEMENTS 256 +#define PAGES_PER_ELEMENT (MAX_NR_PAGES/MAX_ELEMENTS) + +extern u8 physnode_map[]; + +static inline int pfn_to_nid(unsigned long pfn) +{ +#ifdef CONFIG_NUMA + return(physnode_map[(pfn) / PAGES_PER_ELEMENT]); +#else + return 0; +#endif +} + +static inline struct pglist_data *pfn_to_pgdat(unsigned long pfn) +{ + return(NODE_DATA(pfn_to_nid(pfn))); +} + /* * Following are macros that are specific to this numa platform. @@ -43,11 +85,6 @@ extern struct pglist_data *node_data[]; */ #define kvaddr_to_nid(kaddr) pfn_to_nid(__pa(kaddr) >> PAGE_SHIFT) -/* - * Return a pointer to the node data for node n. - */ -#define NODE_DATA(nid) (node_data[nid]) - #define node_mem_map(nid) (NODE_DATA(nid)->node_mem_map) #define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn) #define node_end_pfn(nid) \ @@ -93,40 +130,6 @@ extern struct pglist_data *node_data[]; */ #define pfn_valid(pfn) ((pfn) < num_physpages) -/* - * generic node memory support, the following assumptions apply: - * - * 1) memory comes in 256Mb contigious chunks which are either present or not - * 2) we will not have more than 64Gb in total - * - * for now assume that 64Gb is max amount of RAM for whole system - * 64Gb / 4096bytes/page = 16777216 pages - */ -#define MAX_NR_PAGES 16777216 -#define MAX_ELEMENTS 256 -#define PAGES_PER_ELEMENT (MAX_NR_PAGES/MAX_ELEMENTS) - -extern u8 physnode_map[]; - -static inline int pfn_to_nid(unsigned long pfn) -{ - return(physnode_map[(pfn) / PAGES_PER_ELEMENT]); -} -static inline struct pglist_data *pfn_to_pgdat(unsigned long pfn) -{ - return(NODE_DATA(pfn_to_nid(pfn))); -} - -#ifdef CONFIG_X86_NUMAQ -#include <asm/numaq.h> -#elif CONFIG_ACPI_SRAT -#include <asm/srat.h> -#elif CONFIG_X86_PC -#define get_zholes_size(n) (0) -#else -#define pfn_to_nid(pfn) (0) -#endif /* CONFIG_X86_NUMAQ */ - extern int get_memcfg_numa_flat(void ); /* * This allows any one NUMA architecture to be compiled diff -purN -X /home/mbligh/.diff.exclude 276-per_node_rss/include/linux/mmzone.h 278-pfn_to_nid/include/linux/mmzone.h --- 276-per_node_rss/include/linux/mmzone.h 2003-10-14 15:50:34.000000000 -0700 +++ 278-pfn_to_nid/include/linux/mmzone.h 2003-12-11 17:16:48.000000000 -0800 @@ -303,7 +303,7 @@ extern struct pglist_data contig_page_da #define NODE_DATA(nid) (&contig_page_data) #define NODE_MEM_MAP(nid) mem_map #define MAX_NODES_SHIFT 0 - +#define pfn_to_nid(pfn) (0) #else /* CONFIG_DISCONTIGMEM */ #include <asm/mmzone.h> - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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