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[PATCHv4 02/14] mm/zsmalloc: Prepare to variable MAX_PHYSMEM_BITS

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  [PATCHv4 02/14] mm/zsmalloc: Prepare to variable MAX_PHYSMEM_BITS "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2017-08-08 15:00 +0200

#1706507 — [PATCHv4 02/14] mm/zsmalloc: Prepare to variable MAX_PHYSMEM_BITS

With boot-time switching between paging mode we will have variable
MAX_PHYSMEM_BITS.

Let's use the maximum varible possible for CONFIG_X86_5LEVEL=y
configuration to define zsmalloc data structures.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
---
 mm/zsmalloc.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 013eea76685e..468879915d3d 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -93,7 +93,13 @@
 #define MAX_PHYSMEM_BITS BITS_PER_LONG
 #endif
 #endif
+
+#ifdef CONFIG_X86_5LEVEL
+/* MAX_PHYSMEM_BITS is variable, use maximum value here */
+#define _PFN_BITS		(52 - PAGE_SHIFT)
+#else
 #define _PFN_BITS		(MAX_PHYSMEM_BITS - PAGE_SHIFT)
+#endif
 
 /*
  * Memory for allocating for handle keeps object position by
-- 
2.13.2

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