_PFN_BITS is defined with MAX_POSSIBLE_PHYSMEM_BITS that is defined in
the arch specific way particular on x86/x86-64. See the following
commit in the krenel git repository for reference:
02390b87a9459937cdb299e6b34ff33992512ec7
mm/zsmalloc: Prepare to variable MAX_PHYSMEM_BITS
---
defs.h | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/defs.h b/defs.h
index aba58ff..e84c346 100644
--- a/defs.h
+++ b/defs.h
@@ -3531,6 +3531,8 @@ struct arm64_stackframe {
machdep->machspec->last_p4d_read = (ulong)(P4D); \
}
+#define MAX_POSSIBLE_PHYSMEM_BITS 52
+
/*
* PHYSICAL_PAGE_MASK changed (enlarged) between 2.4 and 2.6, so
* for safety, use the 2.6 values to generate it.
@@ -6487,7 +6489,10 @@ void diskdump_device_dump_extract(int, char *, FILE *);
ulong try_zram_decompress(ulonglong pte_val, unsigned char *buf, ulong len, ulonglong vaddr);
#ifdef LZO
#define OBJ_TAG_BITS 1
-#define _PFN_BITS (MAX_PHYSMEM_BITS() - PAGESHIFT())
+#ifndef MAX_POSSIBLE_PHYSMEM_BITS
+#define MAX_POSSIBLE_PHYSMEM_BITS (MAX_PHYSMEM_BITS())
+#endif
+#define _PFN_BITS (MAX_POSSIBLE_PHYSMEM_BITS - PAGESHIFT())
#define OBJ_INDEX_BITS (BITS_PER_LONG - _PFN_BITS - OBJ_TAG_BITS)
#define OBJ_INDEX_MASK ((1 << OBJ_INDEX_BITS) - 1)
#define ZS_HANDLE_SIZE (sizeof(unsigned long))
--
1.8.3.1
--
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