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x86/mm: Introduce the 'no5lvl' kernel parameter

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This kernel parameter allows to force kernel to use 4-level paging even
if hardware and kernel support 5-level paging.

The option may be useful to work around regressions related to 5-level
paging.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Hugh Dickins <hughd@google.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20180518103528.59260-5-kirill.shutemov@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Kirill A. Shutemov
2018-05-18 13:35:25 +03:00
committed by Ingo Molnar
parent ed7588d5dc
commit 372fddf709
6 changed files with 35 additions and 7 deletions
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3
Documentation/admin-guide/kernel-parameters.txt
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@@ -2600,6 +2600,9 @@
emulation library even if a 387 maths coprocessor
is present.
no5lvl [X86-64] Disable 5-level paging mode. Forces
kernel to use 4-level paging instead.
no_console_suspend
[HW] Never suspend the console
Disable suspending of consoles during suspend and