diff options
| author | Kirill A. Shutemov <[email protected]> | 2019-09-13 12:54:52 +0300 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2019-09-16 16:51:20 +0200 |
| commit | 18ec1eaf58fbf2d9009a752a102a3d8e0d905a0f (patch) | |
| tree | bef73f2fc64f66e05461f5c9698978328cb69d4d | |
| parent | bc04a049f058a472695aa22905d57e2b1f4c77d9 (diff) | |
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 <[email protected]>
Acked-by: Dave Hansen <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
| -rw-r--r-- | arch/x86/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 58eae28c3dd6..d4bbebe1d72f 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1483,6 +1483,7 @@ config X86_PAE config X86_5LEVEL bool "Enable 5-level page tables support" + default y select DYNAMIC_MEMORY_LAYOUT select SPARSEMEM_VMEMMAP depends on X86_64 |