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x86/mm: Enable 5-level paging support by default 

Support of boot-time switching between 4- and 5-level paging mode is
upstream since 4.17.

We run internal testing with 5-level paging support enabled for a while
and it doesn't not cause any functional or performance regression on
4-level paging hardware.

The only 5-level paging related regressions I saw were in early boot
code that runs independently from CONFIG_X86_5LEVEL.

The next major release of distributions expected to have
CONFIG_X86_5LEVEL=y.

Enable the option by default. It may help to catch obscure bugs early.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.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: https://lkml.kernel.org/r/20190913095452.40592-1-kirill.shutemov@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Kirill A. Shutemov 2019-09-13 12:54:52 +03:00 committed by Ingo Molnar
parent bc04a049f0
commit 18ec1eaf58
1 changed files with 1 additions and 0 deletions
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arch/x86/Kconfig
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@ -1483,6 +1483,7 @@ config X86_PAE
config X86_5LEVEL config X86_5LEVEL
bool "Enable 5-level page tables support" bool "Enable 5-level page tables support"
default y
select DYNAMIC_MEMORY_LAYOUT select DYNAMIC_MEMORY_LAYOUT
select SPARSEMEM_VMEMMAP select SPARSEMEM_VMEMMAP
depends on X86_64 depends on X86_64