x86/Kconfig: Make SPARSEMEM default for 32-bit x86

Sparsemem has been a default memory model for x86-64 for over a decade,
since:

  b263295dbffd ("x86: 64-bit, make sparsemem vmemmap the only memory model").

Make it the default for 32-bit NUMA systems (if there any left) as well.

Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Acked-by: Mel Gorman <mgorman@techsingularity.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@surriel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/1556112252-9339-2-git-send-email-rppt@linux.ibm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 5ad9241..0b91756 100644 (file)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1609,10 +1609,6 @@ config ARCH_DISCONTIGMEM_ENABLE
        def_bool y
        depends on NUMA && X86_32
 
-config ARCH_DISCONTIGMEM_DEFAULT
-       def_bool y
-       depends on NUMA && X86_32
-
 config ARCH_SPARSEMEM_ENABLE
        def_bool y
        depends on X86_64 || NUMA || X86_32 || X86_32_NON_STANDARD
@@ -1620,8 +1616,7 @@ config ARCH_SPARSEMEM_ENABLE
        select SPARSEMEM_VMEMMAP_ENABLE if X86_64
 
 config ARCH_SPARSEMEM_DEFAULT
-       def_bool y
-       depends on X86_64
+       def_bool X86_64 || (NUMA && X86_32)
 
 config ARCH_SELECT_MEMORY_MODEL
        def_bool y