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Date: Wed, 23 Feb 2011 12:08:07 GMT
From: tip-bot for Henrik Kretzschmar <henne@...htwindheim.de>
To: linux-tip-commits@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
tglx@...utronix.de, henne@...htwindheim.de, mingo@...e.hu
Subject: [tip:x86/apic] x86: Rework arch_disable_smp_support() for x86
Commit-ID: 7167d08e780a722fa79ea414fc4e72bc00751392
Gitweb: http://git.kernel.org/tip/7167d08e780a722fa79ea414fc4e72bc00751392
Author: Henrik Kretzschmar <henne@...htwindheim.de>
AuthorDate: Tue, 22 Feb 2011 15:38:05 +0100
Committer: Ingo Molnar <mingo@...e.hu>
CommitDate: Wed, 23 Feb 2011 11:38:45 +0100
x86: Rework arch_disable_smp_support() for x86
Currently arch_disable_smp_support() on x86 disables only the
support for the IOAPIC and is also compiled in if SMP-support is
not.
Therefore this function is renamed to disable_ioapic_support(),
which meets its purpose and is only compiled in the kernel
when IOAPIC support is also.
A new arch_disable_smp_support() is created in smpboot.c,
which calls disable_ioapic_support() and gets only compiled
in the kernel when SMP support is also.
Signed-off-by: Henrik Kretzschmar <henne@...htwindheim.de>
LKML-Reference: <1298385487-4708-3-git-send-email-henne@...htwindheim.de>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
arch/x86/include/asm/io_apic.h | 3 +++
arch/x86/kernel/apic/apic.c | 3 ++-
arch/x86/kernel/apic/io_apic.c | 7 +++++--
arch/x86/kernel/smpboot.c | 11 ++++++++++-
4 files changed, 20 insertions(+), 4 deletions(-)
diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
index b24915f..0be2f27 100644
--- a/arch/x86/include/asm/io_apic.h
+++ b/arch/x86/include/asm/io_apic.h
@@ -175,6 +175,8 @@ extern void __init pre_init_apic_IRQ0(void);
extern void mp_save_irq(struct mpc_intsrc *m);
+extern void disable_ioapic_support(void);
+
#else /* !CONFIG_X86_IO_APIC */
#define io_apic_assign_pci_irqs 0
@@ -189,6 +191,7 @@ struct io_apic_irq_attr;
static inline int io_apic_set_pci_routing(struct device *dev, int irq,
struct io_apic_irq_attr *irq_attr) { return 0; }
static inline void mp_save_irq(struct mpc_intsrc *m) { };
+static inline void disable_ioapic_support(void) { }
#endif
#endif /* _ASM_X86_IO_APIC_H */
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 76b96d7..96e6809 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -43,6 +43,7 @@
#include <asm/i8259.h>
#include <asm/proto.h>
#include <asm/apic.h>
+#include <asm/io_apic.h>
#include <asm/desc.h>
#include <asm/hpet.h>
#include <asm/idle.h>
@@ -1209,7 +1210,7 @@ void __cpuinit setup_local_APIC(void)
rdtscll(tsc);
if (disable_apic) {
- arch_disable_smp_support();
+ disable_ioapic_support();
return;
}
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index ca9e2a3..a2f2bf8 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -108,7 +108,10 @@ DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES);
int skip_ioapic_setup;
-void arch_disable_smp_support(void)
+/**
+ * disable_ioapic_support() - disables ioapic support at runtime
+ */
+void disable_ioapic_support(void)
{
#ifdef CONFIG_PCI
noioapicquirk = 1;
@@ -120,7 +123,7 @@ void arch_disable_smp_support(void)
static int __init parse_noapic(char *str)
{
/* disable IO-APIC */
- arch_disable_smp_support();
+ disable_ioapic_support();
return 0;
}
early_param("noapic", parse_noapic);
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 08776a9..09d0172 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -64,6 +64,7 @@
#include <asm/mtrr.h>
#include <asm/mwait.h>
#include <asm/apic.h>
+#include <asm/io_apic.h>
#include <asm/setup.h>
#include <asm/uv/uv.h>
#include <linux/mc146818rtc.h>
@@ -945,6 +946,14 @@ int __cpuinit native_cpu_up(unsigned int cpu)
return 0;
}
+/**
+ * arch_disable_smp_support() - disables SMP support for x86 at runtime
+ */
+void arch_disable_smp_support(void)
+{
+ disable_ioapic_support();
+}
+
/*
* Fall back to non SMP mode after errors.
*
@@ -1045,7 +1054,7 @@ static int __init smp_sanity_check(unsigned max_cpus)
"(tell your hw vendor)\n");
}
smpboot_clear_io_apic();
- arch_disable_smp_support();
+ disable_ioapic_support();
return -1;
}
--
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