x86/mm: Make __VIRTUAL_MASK_SHIFT dynamic

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For boot-time switching between paging modes, we need to be able to
adjust virtual mask shifts.

The change doesn't affect the kernel image size much:

   text	   data	    bss	    dec	    hex	filename
8628892	4734340	1368064	14731296	 e0c820	vmlinux.before
8628966	4734340	1368064	14731370	 e0c86a	vmlinux.after

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/20180214111656.88514-9-kirill.shutemov@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

...

This commit is contained in:

Kirill A. Shutemov 2018-02-14 14:16:55 +03:00 • committed by Ingo Molnar

parent 162434e7f5

commit 09e61a779e

4 changed files with 26 additions and 4 deletions

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12

arch/x86/entry/entry_64.S

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2

arch/x86/include/asm/page_64_types.h

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12

arch/x86/mm/dump_pagetables.c

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4

arch/x86/mm/kaslr.c

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