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-rw-r--r--include/linux/page-flags-layout.h18
1 files changed, 11 insertions, 7 deletions
diff --git a/include/linux/page-flags-layout.h b/include/linux/page-flags-layout.h
index 1dda31825ec4..71283739ffd2 100644
--- a/include/linux/page-flags-layout.h
+++ b/include/linux/page-flags-layout.h
@@ -32,6 +32,7 @@
32 32
33#endif /* CONFIG_SPARSEMEM */ 33#endif /* CONFIG_SPARSEMEM */
34 34
35#ifndef BUILD_VDSO32_64
35/* 36/*
36 * page->flags layout: 37 * page->flags layout:
37 * 38 *
@@ -76,20 +77,22 @@
76#define LAST_CPUPID_SHIFT 0 77#define LAST_CPUPID_SHIFT 0
77#endif 78#endif
78 79
79#if SECTIONS_WIDTH+ZONES_WIDTH+NODES_SHIFT+LAST_CPUPID_SHIFT <= BITS_PER_LONG - NR_PAGEFLAGS 80#ifdef CONFIG_KASAN_SW_TAGS
81#define KASAN_TAG_WIDTH 8
82#else
83#define KASAN_TAG_WIDTH 0
84#endif
85
86#if SECTIONS_WIDTH+ZONES_WIDTH+NODES_SHIFT+LAST_CPUPID_SHIFT+KASAN_TAG_WIDTH \
87 <= BITS_PER_LONG - NR_PAGEFLAGS
80#define LAST_CPUPID_WIDTH LAST_CPUPID_SHIFT 88#define LAST_CPUPID_WIDTH LAST_CPUPID_SHIFT
81#else 89#else
82#define LAST_CPUPID_WIDTH 0 90#define LAST_CPUPID_WIDTH 0
83#endif 91#endif
84 92
85#ifdef CONFIG_KASAN_SW_TAGS
86#define KASAN_TAG_WIDTH 8
87#if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH+LAST_CPUPID_WIDTH+KASAN_TAG_WIDTH \ 93#if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH+LAST_CPUPID_WIDTH+KASAN_TAG_WIDTH \
88 > BITS_PER_LONG - NR_PAGEFLAGS 94 > BITS_PER_LONG - NR_PAGEFLAGS
89#error "KASAN: not enough bits in page flags for tag" 95#error "Not enough bits in page flags"
90#endif
91#else
92#define KASAN_TAG_WIDTH 0
93#endif 96#endif
94 97
95/* 98/*
@@ -104,4 +107,5 @@
104#define LAST_CPUPID_NOT_IN_PAGE_FLAGS 107#define LAST_CPUPID_NOT_IN_PAGE_FLAGS
105#endif 108#endif
106 109
110#endif
107#endif /* _LINUX_PAGE_FLAGS_LAYOUT */ 111#endif /* _LINUX_PAGE_FLAGS_LAYOUT */