This is a note to let you know that I've just added the patch titled

    mm/zsmalloc: Prepare to variable MAX_PHYSMEM_BITS

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     mm-zsmalloc-prepare-to-variable-max_physmem_bits.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let [off-list ref] know about it.


From foo@baz Thu Nov  4 09:33:49 AM CET 2021
From: Florian Fainelli <f.fainelli@gmail.com>
Date: Wed,  3 Nov 2021 13:57:13 -0700
Subject: mm/zsmalloc: Prepare to variable MAX_PHYSMEM_BITS
To: linux-kernel@vger.kernel.org
Cc: stable@vger.kernel.org, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Sasha Levin <sashal@kernel.org>, "Kirill A. Shutemov" <redacted>, Nitin Gupta <redacted>, Minchan Kim <minchan@kernel.org>, Andy Lutomirski <luto@amacapital.net>, Borislav Petkov <redacted>, Linus Torvalds <torvalds@linux-foundation.org>, Peter Zijlstra <peterz@infradead.org>, Sergey Senozhatsky <redacted>, Thomas Gleixner <redacted>, linux-mm@kvack.org, Ingo Molnar <mingo@kernel.org>, Florian Fainelli <f.fainelli@gmail.com>, Vineet Gupta <redacted>, Russell King <linux@armlinux.org.uk>, Ralf Baechle <redacted>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Paul Mackerras <redacted>, Michael Ellerman <mpe@ellerman.id.au>, Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>, x86@kernel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)), Arnd Bergmann <arnd@arndb.de>, Thomas Bogendoerfer <tsb
 ogend@alpha.franken.de>, Mike Rapoport [off-list ref], Stefan Agner [off-list ref], linux-snps-arc@lists.infradead.org (open list:SYNOPSYS ARC ARCHITECTURE), linux-arm-kernel@lists.infradead.org (moderated list:ARM PORT), linux-mips@linux-mips.org (open list:MIPS), linuxppc-dev@lists.ozlabs.org (open list:LINUX FOR POWERPC (32-BIT AND 64-BIT)), linux-arch@vger.kernel.org (open list:GENERIC INCLUDE/ASM HEADER FILES)
Message-ID: [ref]

From: "Kirill A. Shutemov" <redacted>

commit 02390b87a9459937cdb299e6b34ff33992512ec7 upstream

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

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

The patch introduces MAX_POSSIBLE_PHYSMEM_BITS to cover such case.
It also suits well to handle PAE special case.

Signed-off-by: Kirill A. Shutemov <redacted>
Reviewed-by: Nitin Gupta <redacted>
Acked-by: Minchan Kim <minchan@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <redacted>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sergey Senozhatsky <redacted>
Cc: Thomas Gleixner <redacted>
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/20180214111656.88514-3-kirill.shutemov@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
[florian: drop arch/x86/include/asm/pgtable_64_types.h changes since
there is no CONFIG_X86_5LEVEL]
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 arch/x86/include/asm/pgtable-3level_types.h |    1 +
 mm/zsmalloc.c                               |   13 +++++++------
 2 files changed, 8 insertions(+), 6 deletions(-)

--- a/arch/x86/include/asm/pgtable-3level_types.h
+++ b/arch/x86/include/asm/pgtable-3level_types.h

@@ -42,5 +42,6 @@ typedef union {
  */
 #define PTRS_PER_PTE	512
 
+#define MAX_POSSIBLE_PHYSMEM_BITS	36
 
 #endif /* _ASM_X86_PGTABLE_3LEVEL_DEFS_H */
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c

@@ -83,18 +83,19 @@
  * This is made more complicated by various memory models and PAE.
  */
 
-#ifndef MAX_PHYSMEM_BITS
-#ifdef CONFIG_HIGHMEM64G
-#define MAX_PHYSMEM_BITS 36
-#else /* !CONFIG_HIGHMEM64G */
+#ifndef MAX_POSSIBLE_PHYSMEM_BITS
+#ifdef MAX_PHYSMEM_BITS
+#define MAX_POSSIBLE_PHYSMEM_BITS MAX_PHYSMEM_BITS
+#else
 /*
  * If this definition of MAX_PHYSMEM_BITS is used, OBJ_INDEX_BITS will just
  * be PAGE_SHIFT
  */
-#define MAX_PHYSMEM_BITS BITS_PER_LONG
+#define MAX_POSSIBLE_PHYSMEM_BITS BITS_PER_LONG
 #endif
 #endif
-#define _PFN_BITS		(MAX_PHYSMEM_BITS - PAGE_SHIFT)
+
+#define _PFN_BITS		(MAX_POSSIBLE_PHYSMEM_BITS - PAGE_SHIFT)
 
 /*
  * Memory for allocating for handle keeps object position by

Patches currently in stable-queue which might be from f.fainelli@gmail.com are

queue-4.9/mm-zsmalloc-prepare-to-variable-max_physmem_bits.patch
queue-4.9/arch-pgtable-define-max_possible_physmem_bits-where-needed.patch

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