The patch titled
x86: fully honor "nolapic"
has been added to the -mm tree. Its filename is
x86-fully-honor-nolapic.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find
out what to do about this
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: x86: fully honor "nolapic"
From: "Jan Beulich" <jbeulich@xxxxxxxxxx>
"nolapic" should not only suppress SMP and use of the LAPIC, but it
also ought to have the effect of disabling all IO-APIC related activity
as well as PCI MSI and HT-IRQs.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Andi Kleen <andi@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/kernel/apic.c | 7 ++++++-
arch/x86/kernel/io_apic.c | 6 ++++++
arch/x86/kernel/smpboot.c | 1 +
3 files changed, 13 insertions(+), 1 deletion(-)
diff -puN arch/x86/kernel/apic.c~x86-fully-honor-nolapic arch/x86/kernel/apic.c
--- a/arch/x86/kernel/apic.c~x86-fully-honor-nolapic
+++ a/arch/x86/kernel/apic.c
@@ -1126,6 +1126,11 @@ void __cpuinit setup_local_APIC(void)
unsigned int value;
int i, j;
+ if (disable_apic) {
+ disable_ioapic_setup();
+ return;
+ }
+
#ifdef CONFIG_X86_32
/* Pound the ESR really hard over the head with a big hammer - mbligh */
if (lapic_is_integrated() && esr_disable) {
@@ -1566,11 +1571,11 @@ int apic_version[MAX_APICS];
int __init APIC_init_uniprocessor(void)
{
-#ifdef CONFIG_X86_64
if (disable_apic) {
pr_info("Apic disabled\n");
return -1;
}
+#ifdef CONFIG_X86_64
if (!cpu_has_apic) {
disable_apic = 1;
pr_info("Apic disabled by BIOS\n");
diff -puN arch/x86/kernel/io_apic.c~x86-fully-honor-nolapic arch/x86/kernel/io_apic.c
--- a/arch/x86/kernel/io_apic.c~x86-fully-honor-nolapic
+++ a/arch/x86/kernel/io_apic.c
@@ -3258,6 +3258,9 @@ static int msi_compose_msg(struct pci_de
int err;
unsigned dest;
+ if (disable_apic)
+ return -ENXIO;
+
cfg = irq_cfg(irq);
err = assign_irq_vector(irq, cfg, TARGET_CPUS);
if (err)
@@ -3726,6 +3729,9 @@ int arch_setup_ht_irq(unsigned int irq,
struct irq_cfg *cfg;
int err;
+ if (disable_apic)
+ return -ENXIO;
+
cfg = irq_cfg(irq);
err = assign_irq_vector(irq, cfg, TARGET_CPUS);
if (!err) {
diff -puN arch/x86/kernel/smpboot.c~x86-fully-honor-nolapic arch/x86/kernel/smpboot.c
--- a/arch/x86/kernel/smpboot.c~x86-fully-honor-nolapic
+++ a/arch/x86/kernel/smpboot.c
@@ -1125,6 +1125,7 @@ static int __init smp_sanity_check(unsig
printk(KERN_ERR "... forcing use of dummy APIC emulation."
"(tell your hw vendor)\n");
smpboot_clear_io_apic();
+ disable_ioapic_setup();
return -1;
}
_
Patches currently in -mm which might be from jbeulich@xxxxxxxxxx are
i386-fix-assumed-to-be-contiguous-leaf-page-tables-for-kmap_atomic-region.patch
x86-fully-honor-nolapic.patch
x86-avoid-early-crash-in-disable_local_apic.patch
x86-simplify-highmem-related-kconfig-entries.patch
--
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
