Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
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linux
x86, x2apic: Don't map lapic addr for preenabled x2apic systems
If x2apic is preenabled and used by the kernel, we don't need to map
the lapic address. That mapping will never be used.
So just skip that in register_lapic_address()
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
LKML-Reference: <4CFDF69C.9070501@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
authored by Yinghai Lu and committed by Thomas Gleixner 0450193b 53301f36
+5
-3
arch/x86/kernel/apic/apic.c
+5
-3
arch/x86/kernel/apic/apic.c
···
1681
{
1682
mp_lapic_addr = address;
1683
1684
-
set_fixmap_nocache(FIX_APIC_BASE, address);
1685
-
apic_printk(APIC_VERBOSE, "mapped APIC to %16lx (%16lx)\n",
1686
-
APIC_BASE, mp_lapic_addr);
1687
if (boot_cpu_physical_apicid == -1U) {
1688
boot_cpu_physical_apicid = read_apic_id();
1689
apic_version[boot_cpu_physical_apicid] =
···
1681
{
1682
mp_lapic_addr = address;
1683
1684
+
if (!x2apic_mode) {
1685
+
set_fixmap_nocache(FIX_APIC_BASE, address);
1686
+
apic_printk(APIC_VERBOSE, "mapped APIC to %16lx (%16lx)\n",
1687
+
APIC_BASE, mp_lapic_addr);
1688
+
}
1689
if (boot_cpu_physical_apicid == -1U) {
1690
boot_cpu_physical_apicid = read_apic_id();
1691
apic_version[boot_cpu_physical_apicid] =