x86, sleep: Always save the value of EFER

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Always save the value of EFER, regardless of the state of NX.  Since
EFER may not actually exist, use rdmsr_safe() to do so.

v2: check the return value from rdmsr_safe() instead of relying on
    the output values being unchanged on error.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Acked-by: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Nigel Cunningham <nigel@tuxonice.net>
LKML-Reference: <1258154897-6770-3-git-send-email-hpa@zytor.com>
Acked-by: Kees Cook <kees.cook@canonical.com>

...

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H. Peter Anvin 2009-11-13 15:28:14 -08:00

parent 8a50e5135a

commit a7c4c0d934

1 changed files with 3 additions and 6 deletions

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arch/x86/kernel/acpi/sleep.c

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