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Revert "x86-64/efi: Use EFI to deal with platform wall clock"

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This reverts commit bacef661ac.

This commit has been found to cause serious regressions on a number of
ASUS machines at the least.  We probably need to provide a 1:1 map in
addition to the EFI virtual memory map in order for this to work.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Reported-and-bisected-by: Jérôme Carretero <cJ-ko@zougloub.eu>
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Matt Fleming <matt.fleming@intel.com>
Cc: Matthew Garrett <mjg@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20120805172903.5f8bb24c@zougloub.eu
This commit is contained in:
H. Peter Anvin
2012-08-14 09:53:38 -07:00
parent f1c6300183
commit f026cfa82f
4 changed files with 36 additions and 14 deletions
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10
arch/x86/mm/pageattr.c
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@@ -919,13 +919,11 @@ static int change_page_attr_set_clr(unsigned long *addr, int numpages,
/*
* On success we use clflush, when the CPU supports it to
* avoid the wbindv. If the CPU does not support it, in the
* error case, and during early boot (for EFI) we fall back
* to cpa_flush_all (which uses wbinvd):
* avoid the wbindv. If the CPU does not support it and in the
* error case we fall back to cpa_flush_all (which uses
* wbindv):
*/
if (early_boot_irqs_disabled)
__cpa_flush_all((void *)(long)cache);
else if (!ret && cpu_has_clflush) {
if (!ret && cpu_has_clflush) {
if (cpa.flags & (CPA_PAGES_ARRAY | CPA_ARRAY)) {
cpa_flush_array(addr, numpages, cache,
cpa.flags, pages);