projects / GitHub / exynos8895 / android_kernel_samsung_universal8895.git / blame
| Commit | Line | Data |
|---|---|---|
| 6b74ab97 MG |
1 | /* |
| 2 | * mm_init.c - Memory initialisation verification and debugging | |
| 3 | * | |
| 4 | * Copyright 2008 IBM Corporation, 2008 | |
| 5 | * Author Mel Gorman <mel@csn.ul.ie> | |
| 6 | * | |
| 7 | */ | |
| 8 | #include <linux/kernel.h> | |
| 9 | #include <linux/init.h> | |
| 708614e6 | 10 | #include "internal.h" |
| 6b74ab97 MG |
11 | |
| 12 | int __meminitdata mminit_loglevel; | |
| 13 | ||
| 708614e6 MG |
14 | void __init mminit_verify_pageflags_layout(void) |
| 15 | { | |
| 16 | int shift, width; | |
| 17 | unsigned long or_mask, add_mask; | |
| 18 | ||
| 19 | shift = 8 * sizeof(unsigned long); | |
| 20 | width = shift - SECTIONS_WIDTH - NODES_WIDTH - ZONES_WIDTH; | |
| 21 | mminit_dprintk(MMINIT_TRACE, "pageflags_layout_widths", | |
| 22 | "Section %d Node %d Zone %d Flags %d\n", | |
| 23 | SECTIONS_WIDTH, | |
| 24 | NODES_WIDTH, | |
| 25 | ZONES_WIDTH, | |
| 26 | NR_PAGEFLAGS); | |
| 27 | mminit_dprintk(MMINIT_TRACE, "pageflags_layout_shifts", | |
| 28 | "Section %d Node %d Zone %d\n", | |
| 29 | #ifdef SECTIONS_SHIFT | |
| 30 | SECTIONS_SHIFT, | |
| 31 | #else | |
| 32 | 0, | |
| 33 | #endif | |
| 34 | NODES_SHIFT, | |
| 35 | ZONES_SHIFT); | |
| 36 | mminit_dprintk(MMINIT_TRACE, "pageflags_layout_offsets", | |
| 37 | "Section %lu Node %lu Zone %lu\n", | |
| 38 | (unsigned long)SECTIONS_PGSHIFT, | |
| 39 | (unsigned long)NODES_PGSHIFT, | |
| 40 | (unsigned long)ZONES_PGSHIFT); | |
| 41 | mminit_dprintk(MMINIT_TRACE, "pageflags_layout_zoneid", | |
| 42 | "Zone ID: %lu -> %lu\n", | |
| 43 | (unsigned long)ZONEID_PGOFF, | |
| 44 | (unsigned long)(ZONEID_PGOFF + ZONEID_SHIFT)); | |
| 45 | mminit_dprintk(MMINIT_TRACE, "pageflags_layout_usage", | |
| 46 | "location: %d -> %d unused %d -> %d flags %d -> %d\n", | |
| 47 | shift, width, width, NR_PAGEFLAGS, NR_PAGEFLAGS, 0); | |
| 48 | #ifdef NODE_NOT_IN_PAGE_FLAGS | |
| 49 | mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodeflags", | |
| 50 | "Node not in page flags"); | |
| 51 | #endif | |
| 52 | ||
| 53 | if (SECTIONS_WIDTH) { | |
| 54 | shift -= SECTIONS_WIDTH; | |
| 55 | BUG_ON(shift != SECTIONS_PGSHIFT); | |
| 56 | } | |
| 57 | if (NODES_WIDTH) { | |
| 58 | shift -= NODES_WIDTH; | |
| 59 | BUG_ON(shift != NODES_PGSHIFT); | |
| 60 | } | |
| 61 | if (ZONES_WIDTH) { | |
| 62 | shift -= ZONES_WIDTH; | |
| 63 | BUG_ON(shift != ZONES_PGSHIFT); | |
| 64 | } | |
| 65 | ||
| 66 | /* Check for bitmask overlaps */ | |
| 67 | or_mask = (ZONES_MASK << ZONES_PGSHIFT) | | |
| 68 | (NODES_MASK << NODES_PGSHIFT) | | |
| 69 | (SECTIONS_MASK << SECTIONS_PGSHIFT); | |
| 70 | add_mask = (ZONES_MASK << ZONES_PGSHIFT) + | |
| 71 | (NODES_MASK << NODES_PGSHIFT) + | |
| 72 | (SECTIONS_MASK << SECTIONS_PGSHIFT); | |
| 73 | BUG_ON(or_mask != add_mask); | |
| 74 | } | |
| 75 | ||
| 76 | void __meminit mminit_verify_page_links(struct page *page, enum zone_type zone, | |
| 77 | unsigned long nid, unsigned long pfn) | |
| 78 | { | |
| 79 | BUG_ON(page_to_nid(page) != nid); | |
| 80 | BUG_ON(page_zonenum(page) != zone); | |
| 81 | BUG_ON(page_to_pfn(page) != pfn); | |
| 82 | } | |
| 83 | ||
| 6b74ab97 MG |
84 | static __init int set_mminit_loglevel(char *str) |
| 85 | { | |
| 86 | get_option(&str, &mminit_loglevel); | |
| 87 | return 0; | |
| 88 | } | |
| 89 | early_param("mminit_loglevel", set_mminit_loglevel); |