x86/mm: Document how CR4.PCIDE restore works

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While debugging a problem, I thought that using
cr4_set_bits_and_update_boot() to restore CR4.PCIDE would be
helpful.  It turns out to be counterproductive.

Add a comment documenting how this works.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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Andy Lutomirski 2017-09-06 19:54:54 -07:00 • committed by Linus Torvalds

parent 72c0098d92

commit 1c9fe4409c

1 changed files with 13 additions and 0 deletions

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arch/x86/kernel/cpu/common.c

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