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x86/apic: Get rid of apic_version[] array

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The array has a size of MAX_LOCAL_APIC, which can be as large as 32k, so it
can consume up to 128k.

The array has been there forever and was never used for anything useful
other than a version mismatch check which was introduced in 2009.

There is no reason to store the version in an array. The kernel is not
prepared to handle different APIC versions anyway, so the real important
part is to detect a version mismatch and warn about it, which can be done
with a single variable as well.

[ tglx: Massaged changelog ]

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
CC: Andy Lutomirski <luto@amacapital.net>
CC: Borislav Petkov <bp@alien8.de>
CC: Brian Gerst <brgerst@gmail.com>
CC: Mike Travis <travis@sgi.com>
Link: http://lkml.kernel.org/r/20160913181232.30815-1-dvlasenk@redhat.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Denys Vlasenko
2016-09-13 20:12:32 +02:00
committed by Thomas Gleixner
parent b0f48706a1
commit cff9ab2b29
6 changed files with 17 additions and 20 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
arch/x86/kernel/smpboot.c
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@@ -683,7 +683,7 @@ wakeup_secondary_cpu_via_nmi(int apicid, unsigned long start_eip)
* Give the other CPU some time to accept the IPI.
*/
udelay(200);
if (APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid])) {
if (APIC_INTEGRATED(boot_cpu_apic_version)) {
maxlvt = lapic_get_maxlvt();
if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */
apic_write(APIC_ESR, 0);
@@ -710,7 +710,7 @@ wakeup_secondary_cpu_via_init(int phys_apicid, unsigned long start_eip)
/*
* Be paranoid about clearing APIC errors.
*/
if (APIC_INTEGRATED(apic_version[phys_apicid])) {
if (APIC_INTEGRATED(boot_cpu_apic_version)) {
if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */
apic_write(APIC_ESR, 0);
apic_read(APIC_ESR);
@@ -749,7 +749,7 @@ wakeup_secondary_cpu_via_init(int phys_apicid, unsigned long start_eip)
* Determine this based on the APIC version.
* If we don't have an integrated APIC, don't send the STARTUP IPIs.
*/
if (APIC_INTEGRATED(apic_version[phys_apicid]))
if (APIC_INTEGRATED(boot_cpu_apic_version))
num_starts = 2;
else
num_starts = 0;
@@ -987,7 +987,7 @@ static int do_boot_cpu(int apicid, int cpu, struct task_struct *idle)
/*
* Be paranoid about clearing APIC errors.
*/
if (APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid])) {
if (APIC_INTEGRATED(boot_cpu_apic_version)) {
apic_write(APIC_ESR, 0);
apic_read(APIC_ESR);
}
@@ -1242,7 +1242,7 @@ static int __init smp_sanity_check(unsigned max_cpus)
/*
* If we couldn't find a local APIC, then get out of here now!
*/
if (APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid]) &&
if (APIC_INTEGRATED(boot_cpu_apic_version) &&
!boot_cpu_has(X86_FEATURE_APIC)) {
if (!disable_apic) {
pr_err("BIOS bug, local APIC #%d not detected!...\n",