The patch titled
Subject: x86/mm: drop unused MAX_PHYSADDR_BITS
has been added to the -mm tree. Its filename is
x86-mm-drop-unused-max_physaddr_bits.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/x86-mm-drop-unused-max_physaddr_bits.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/x86-mm-drop-unused-max_physaddr_bits.patch
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From: Arvind Sankar <nivedita@xxxxxxxxxxxx>
Subject: x86/mm: drop unused MAX_PHYSADDR_BITS
Patch series "Drop unused MAX_PHYSADDR_BITS".
This #define is not used anywhere, and has the wrong value on x86_64.
I tried digging into the history a bit, but it seems to have been unused
0even in the initial merge of sparsemem in v2.6.13, when it was first
defined.
This patch (of 3):
The macro is not used anywhere, and has an incorrect value (going by the
comment) on x86_64 since commit
c898faf91b3e ("x86: 46 bit physical address support on 64 bits")
To avoid confusion, just remove the definition.
Link: http://lkml.kernel.org/r/20200723231544.17274-1-nivedita@xxxxxxxxxxxx
Link: http://lkml.kernel.org/r/20200723231544.17274-2-nivedita@xxxxxxxxxxxx
Signed-off-by: Arvind Sankar <nivedita@xxxxxxxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
Cc: Rich Felker <dalias@xxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/include/asm/sparsemem.h | 6 +-----
1 file changed, 1 insertion(+), 5 deletions(-)
--- a/arch/x86/include/asm/sparsemem.h~x86-mm-drop-unused-max_physaddr_bits
+++ a/arch/x86/include/asm/sparsemem.h
@@ -10,24 +10,20 @@
* field of the struct page
*
* SECTION_SIZE_BITS 2^n: size of each section
- * MAX_PHYSADDR_BITS 2^n: max size of physical address space
- * MAX_PHYSMEM_BITS 2^n: how much memory we can have in that space
+ * MAX_PHYSMEM_BITS 2^n: max size of physical address space
*
*/
#ifdef CONFIG_X86_32
# ifdef CONFIG_X86_PAE
# define SECTION_SIZE_BITS 29
-# define MAX_PHYSADDR_BITS 36
# define MAX_PHYSMEM_BITS 36
# else
# define SECTION_SIZE_BITS 26
-# define MAX_PHYSADDR_BITS 32
# define MAX_PHYSMEM_BITS 32
# endif
#else /* CONFIG_X86_32 */
# define SECTION_SIZE_BITS 27 /* matt - 128 is convenient right now */
-# define MAX_PHYSADDR_BITS (pgtable_l5_enabled() ? 52 : 44)
# define MAX_PHYSMEM_BITS (pgtable_l5_enabled() ? 52 : 46)
#endif
_
Patches currently in -mm which might be from nivedita@xxxxxxxxxxxx are
x86-mm-drop-unused-max_physaddr_bits.patch
sh-mm-drop-unused-max_physaddr_bits.patch
sparc-drop-unused-max_physaddr_bits.patch
