From: Tejun Heo <tj@kernel.org>
To: linux-kernel@vger.kernel.org, mingo@redhat.com,
tglx@linutronix.de, hpa@zytor.com, x86@kernel.org,
eric.dumazet@gmail.com, yinghai@kernel.org, brgerst@gmail.com,
gorcunov@gmail.com, penberg@kernel.org, shaohui.zheng@intel.com,
rientjes@google.com
Cc: Tejun Heo <tj@kernel.org>
Subject: [PATCH 04/16] x86: Replace cpu_2_logical_apicid[] with early percpu variable
Date: Thu, 30 Dec 2010 18:49:17 +0100 [thread overview]
Message-ID: <1293731369-10851-5-git-send-email-tj@kernel.org> (raw)
In-Reply-To: <1293731369-10851-1-git-send-email-tj@kernel.org>
Unlike x86_64, on x86_32, the mapping from cpu to logical apicid may
vary depending on apic in use. cpu_2_logical_apicid[] array is used
for this mapping. Replace it with early percpu variable
x86_cpu_to_logical_apicid to make it better aligned with other
mappings.
Signed-off-by: Tejun Heo <tj@kernel.org>
---
arch/x86/include/asm/apic.h | 4 ----
arch/x86/include/asm/smp.h | 3 +++
arch/x86/kernel/apic/apic.c | 11 +++++++++++
arch/x86/kernel/apic/es7000_32.c | 2 +-
arch/x86/kernel/apic/numaq_32.c | 2 +-
arch/x86/kernel/apic/summit_32.c | 4 ++--
arch/x86/kernel/setup_percpu.c | 7 +++++++
arch/x86/kernel/smpboot.c | 7 ++-----
8 files changed, 27 insertions(+), 13 deletions(-)
diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h
index 5e3969c..eb139ec 100644
--- a/arch/x86/include/asm/apic.h
+++ b/arch/x86/include/asm/apic.h
@@ -595,8 +595,4 @@ extern int default_check_phys_apicid_present(int phys_apicid);
#endif /* CONFIG_X86_LOCAL_APIC */
-#ifdef CONFIG_X86_32
-extern u8 cpu_2_logical_apicid[NR_CPUS];
-#endif
-
#endif /* _ASM_X86_APIC_H */
diff --git a/arch/x86/include/asm/smp.h b/arch/x86/include/asm/smp.h
index 4c2f63c..dc7c46a 100644
--- a/arch/x86/include/asm/smp.h
+++ b/arch/x86/include/asm/smp.h
@@ -38,6 +38,9 @@ static inline struct cpumask *cpu_core_mask(int cpu)
DECLARE_EARLY_PER_CPU(u16, x86_cpu_to_apicid);
DECLARE_EARLY_PER_CPU(u16, x86_bios_cpu_apicid);
+#if defined(CONFIG_SMP) && defined(CONFIG_X86_32)
+DECLARE_EARLY_PER_CPU(int, x86_cpu_to_logical_apicid);
+#endif
/* Static state in head.S used to set up a CPU */
extern struct {
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index c0f6426..ba78b1e 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -79,6 +79,17 @@ EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_apicid);
EXPORT_EARLY_PER_CPU_SYMBOL(x86_bios_cpu_apicid);
#ifdef CONFIG_X86_32
+
+#ifdef CONFIG_SMP
+/*
+ * On x86_32, the mapping between cpu and logical apicid may vary
+ * depending on apic in use. The following early percpu variable is
+ * used for the mapping. This is where the behaviors of x86_64 and 32
+ * actually diverge. Let's keep it ugly for now.
+ */
+DEFINE_EARLY_PER_CPU(int, x86_cpu_to_logical_apicid, BAD_APICID);
+#endif
+
/*
* Knob to control our willingness to enable the local APIC.
*
diff --git a/arch/x86/kernel/apic/es7000_32.c b/arch/x86/kernel/apic/es7000_32.c
index 8593582..7cb73e1 100644
--- a/arch/x86/kernel/apic/es7000_32.c
+++ b/arch/x86/kernel/apic/es7000_32.c
@@ -534,7 +534,7 @@ static int es7000_cpu_to_logical_apicid(int cpu)
#ifdef CONFIG_SMP
if (cpu >= nr_cpu_ids)
return BAD_APICID;
- return cpu_2_logical_apicid[cpu];
+ return early_per_cpu(x86_cpu_to_logical_apicid, cpu);
#else
return logical_smp_processor_id();
#endif
diff --git a/arch/x86/kernel/apic/numaq_32.c b/arch/x86/kernel/apic/numaq_32.c
index 960f26a..4ed90c4 100644
--- a/arch/x86/kernel/apic/numaq_32.c
+++ b/arch/x86/kernel/apic/numaq_32.c
@@ -377,7 +377,7 @@ static inline int numaq_cpu_to_logical_apicid(int cpu)
{
if (cpu >= nr_cpu_ids)
return BAD_APICID;
- return cpu_2_logical_apicid[cpu];
+ return early_per_cpu(x86_cpu_to_logical_apicid, cpu);
}
/*
diff --git a/arch/x86/kernel/apic/summit_32.c b/arch/x86/kernel/apic/summit_32.c
index 9b41926..82cfc3e 100644
--- a/arch/x86/kernel/apic/summit_32.c
+++ b/arch/x86/kernel/apic/summit_32.c
@@ -206,7 +206,7 @@ static void summit_init_apic_ldr(void)
/* Create logical APIC IDs by counting CPUs already in cluster. */
for (count = 0, i = nr_cpu_ids; --i >= 0; ) {
- lid = cpu_2_logical_apicid[i];
+ lid = early_per_cpu(x86_cpu_to_logical_apicid, i);
if (lid != BAD_APICID && APIC_CLUSTER(lid) == my_cluster)
++count;
}
@@ -247,7 +247,7 @@ static inline int summit_cpu_to_logical_apicid(int cpu)
#ifdef CONFIG_SMP
if (cpu >= nr_cpu_ids)
return BAD_APICID;
- return cpu_2_logical_apicid[cpu];
+ return early_per_cpu(x86_cpu_to_logical_apicid, cpu);
#else
return logical_smp_processor_id();
#endif
diff --git a/arch/x86/kernel/setup_percpu.c b/arch/x86/kernel/setup_percpu.c
index 002b796..b5147f0 100644
--- a/arch/x86/kernel/setup_percpu.c
+++ b/arch/x86/kernel/setup_percpu.c
@@ -225,6 +225,10 @@ void __init setup_per_cpu_areas(void)
per_cpu(x86_bios_cpu_apicid, cpu) =
early_per_cpu_map(x86_bios_cpu_apicid, cpu);
#endif
+#ifdef CONFIG_X86_32
+ per_cpu(x86_cpu_to_logical_apicid, cpu) =
+ early_per_cpu_map(x86_cpu_to_logical_apicid, cpu);
+#endif
#ifdef CONFIG_X86_64
per_cpu(irq_stack_ptr, cpu) =
per_cpu(irq_stack_union.irq_stack, cpu) +
@@ -256,6 +260,9 @@ void __init setup_per_cpu_areas(void)
early_per_cpu_ptr(x86_cpu_to_apicid) = NULL;
early_per_cpu_ptr(x86_bios_cpu_apicid) = NULL;
#endif
+#ifdef CONFIG_X86_32
+ early_per_cpu_ptr(x86_cpu_to_logical_apicid) = NULL;
+#endif
#if defined(CONFIG_X86_64) && defined(CONFIG_NUMA)
early_per_cpu_ptr(x86_cpu_to_node_map) = NULL;
#endif
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 0b32f17..eb04f30 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -165,9 +165,6 @@ static void unmap_cpu_to_node(int cpu)
#endif
#ifdef CONFIG_X86_32
-u8 cpu_2_logical_apicid[NR_CPUS] __read_mostly =
- { [0 ... NR_CPUS-1] = BAD_APICID };
-
static void map_cpu_to_logical_apicid(void)
{
int cpu = smp_processor_id();
@@ -177,13 +174,13 @@ static void map_cpu_to_logical_apicid(void)
if (!node_online(node))
node = first_online_node;
- cpu_2_logical_apicid[cpu] = apicid;
+ early_per_cpu(x86_cpu_to_logical_apicid, cpu) = apicid;
map_cpu_to_node(cpu, node);
}
void numa_remove_cpu(int cpu)
{
- cpu_2_logical_apicid[cpu] = BAD_APICID;
+ early_per_cpu(x86_cpu_to_logical_apicid, cpu) = BAD_APICID;
unmap_cpu_to_node(cpu);
}
#else
--
1.7.1
next prev parent reply other threads:[~2010-12-30 17:52 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-30 17:49 [PATCHSET] x86: unify x86_32 and 64 NUMA init paths, take#4 Tejun Heo
2010-12-30 17:49 ` [PATCH 01/16] x86: Kill unused static boot_cpu_logical_apicid in smpboot.c Tejun Heo
2011-01-11 3:48 ` David Rientjes
2010-12-30 17:49 ` [PATCH 02/16] x86: Rename x86_32 MAX_APICID to MAX_LOCAL_APIC Tejun Heo
2011-01-11 3:48 ` David Rientjes
2010-12-30 17:49 ` [PATCH 03/16] x86: Make default_send_IPI_mask_sequence/allbutself_logical() 32bit only Tejun Heo
2011-01-11 3:48 ` David Rientjes
2010-12-30 17:49 ` Tejun Heo [this message]
2011-01-11 3:48 ` [PATCH 04/16] x86: Replace cpu_2_logical_apicid[] with early percpu variable David Rientjes
2011-01-11 14:19 ` Tejun Heo
2010-12-30 17:49 ` [PATCH 05/16] x86: Always use x86_cpu_to_logical_apicid for cpu -> logical apic id Tejun Heo
2011-01-13 2:40 ` David Rientjes
2011-01-13 10:57 ` Tejun Heo
2010-12-30 17:49 ` [PATCH 06/16] x86: Kill apic->cpu_to_logical_apicid() Tejun Heo
2011-01-13 2:40 ` David Rientjes
2010-12-30 17:49 ` [PATCH 07/16] x86: Add apic->x86_32_early_logical_apicid() Tejun Heo
2010-12-30 17:49 ` [PATCH 08/16] x86: Implement the default x86_32_early_logical_apicid() Tejun Heo
2010-12-30 17:49 ` [PATCH 09/16] x86: Implement x86_32_early_logical_apicid() for bigsmp_32 Tejun Heo
2010-12-30 17:49 ` [PATCH 10/16] x86: Implement x86_32_early_logical_apicid() for summit_32 Tejun Heo
2010-12-30 17:49 ` [PATCH 11/16] x86: Implement x86_32_early_logical_apicid() for numaq_32 Tejun Heo
2010-12-30 17:49 ` [PATCH 12/16] x86: Replace apic->apicid_to_node() with ->x86_32_numa_cpu_node() Tejun Heo
2010-12-30 17:49 ` [PATCH 13/16] x86: Unify cpu/apicid <-> NUMA node mapping between 32 and 64bit Tejun Heo
2010-12-30 17:49 ` [PATCH 14/16] x86: Unify CPU -> " Tejun Heo
2010-12-30 17:49 ` [PATCH 15/16] x86: Unify node_to_cpumask_map handling " Tejun Heo
2010-12-30 17:49 ` [PATCH 16/16] x86: Unify NUMA initialization " Tejun Heo
2010-12-30 20:14 ` [PATCHSET] x86: unify x86_32 and 64 NUMA init paths, take#4 H. Peter Anvin
2011-01-21 18:16 ` Tejun Heo
2011-01-21 18:49 ` H. Peter Anvin
-- strict thread matches above, loose matches on Subject: below --
2011-01-23 13:37 [PATCHSET] x86: unify x86_32 and 64 NUMA init paths, take#5 Tejun Heo
2011-01-23 13:37 ` [PATCH 04/16] x86: Replace cpu_2_logical_apicid[] with early percpu variable Tejun Heo
2011-01-24 19:58 ` Yinghai Lu
2011-01-24 20:04 ` Tejun Heo
2010-12-28 11:48 [PATCHSET REPOST] x86: unify x86_32 and 64 NUMA init paths, take#3 Tejun Heo
2010-12-28 11:48 ` [PATCH 04/16] x86: Replace cpu_2_logical_apicid[] with early percpu variable Tejun Heo
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