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Revert "x86/apic: Only disable CPU x2apic mode when necessary" 

This reverts commit 5fcee53ce7.

It causes the suspend to fail on at least the Chromebook Pixel, possibly
other platforms too.

Joerg Roedel points out that the logic should probably have been

                if (max_physical_apicid > 255 ||
                    !(IS_ENABLED(CONFIG_HYPERVISOR_GUEST) &&
                      hypervisor_x2apic_available())) {

instead, but since the code is not in any fast-path, so we can just live
without that optimization and just revert to the original code.

Acked-by: Joerg Roedel <joro@8bytes.org>
Acked-by: Jiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2015-02-13 10:26:18 -08:00
parent b9085bcbf5
commit 8329aa9fff
1 changed files with 1 additions and 2 deletions
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3
arch/x86/kernel/apic/apic.c
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@ -1580,8 +1580,7 @@ static __init void try_to_enable_x2apic(int remap_mode)
* under KVM * under KVM
*/ */
if (max_physical_apicid > 255 || if (max_physical_apicid > 255 ||
(IS_ENABLED(CONFIG_HYPERVISOR_GUEST) && !hypervisor_x2apic_available()) {
!hypervisor_x2apic_available())) {
pr_info("x2apic: IRQ remapping doesn't support X2APIC mode\n"); pr_info("x2apic: IRQ remapping doesn't support X2APIC mode\n");
x2apic_disable(); x2apic_disable();
return; return;