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Subject[PATCH] arm: platsmp: Allow secondary cpu hotplug with maxcpus=1
Date
If an ARM system has multiple cpus in the same socket and the
kernel is booted with maxcpus=1, secondary cpus are possible but
not present due to how platform_smp_prepare_cpus() is called.
Fix this by always calling platform_smp_prepare_cpus() as long as
max_cpus is non-zero (0 means no SMP) to allow platform code to
decide if any non-boot cpus are present in the system. Since
all current platform code doesn't support physical hotplug we
have a situation where possible == present and thus we can
simply copy the possible map to the present map.

With this patch it's possible to boot an ARM system with
maxcpus=1 on the command line and then hotplug in secondary cpus
via sysfs. This is more in line with how x86 works with maxcpus=1
on the command line.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
---

This patch was tested along with an MSM patch:

https://lkml.org/lkml/2011/4/7/354

I don't have any non-MSM hardware to test on so Acks and
tested-bys are welcome.

arch/arm/kernel/smp.c | 3 +--
arch/arm/mach-exynos4/platsmp.c | 5 +----
arch/arm/mach-msm/platsmp.c | 5 +----
arch/arm/mach-omap2/omap-smp.c | 5 +----
arch/arm/mach-realview/platsmp.c | 5 +----
arch/arm/mach-shmobile/platsmp.c | 5 +----
arch/arm/mach-tegra/platsmp.c | 5 +----
arch/arm/mach-ux500/platsmp.c | 5 +----
arch/arm/mach-vexpress/ct-ca9x4.c | 5 +----
9 files changed, 9 insertions(+), 34 deletions(-)

diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index e7f92a4..fbaa24a 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -365,8 +365,7 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
*/
if (max_cpus > ncores)
max_cpus = ncores;
-
- if (max_cpus > 1) {
+ if (ncores > 1 && max_cpus) {
/*
* Enable the local timer or broadcast device for the
* boot CPU, but only if we have more than one CPU.
diff --git a/arch/arm/mach-exynos4/platsmp.c b/arch/arm/mach-exynos4/platsmp.c
index c5e65a0..3f870d2 100644
--- a/arch/arm/mach-exynos4/platsmp.c
+++ b/arch/arm/mach-exynos4/platsmp.c
@@ -154,14 +154,11 @@ void __init smp_init_cpus(void)

void __init platform_smp_prepare_cpus(unsigned int max_cpus)
{
- int i;
-
/*
* Initialise the present map, which describes the set of CPUs
* actually populated at the present time.
*/
- for (i = 0; i < max_cpus; i++)
- set_cpu_present(i, true);
+ init_cpu_present(&cpu_possible_map);

scu_enable(scu_base_addr());

diff --git a/arch/arm/mach-msm/platsmp.c b/arch/arm/mach-msm/platsmp.c
index 2034098..84e293f 100644
--- a/arch/arm/mach-msm/platsmp.c
+++ b/arch/arm/mach-msm/platsmp.c
@@ -157,12 +157,9 @@ void __init smp_init_cpus(void)

void __init platform_smp_prepare_cpus(unsigned int max_cpus)
{
- int i;
-
/*
* Initialise the present map, which describes the set of CPUs
* actually populated at the present time.
*/
- for (i = 0; i < max_cpus; i++)
- set_cpu_present(i, true);
+ init_cpu_present(&cpu_possible_map);
}
diff --git a/arch/arm/mach-omap2/omap-smp.c b/arch/arm/mach-omap2/omap-smp.c
index ecfe93c..5895d19 100644
--- a/arch/arm/mach-omap2/omap-smp.c
+++ b/arch/arm/mach-omap2/omap-smp.c
@@ -125,14 +125,11 @@ void __init smp_init_cpus(void)

void __init platform_smp_prepare_cpus(unsigned int max_cpus)
{
- int i;
-
/*
* Initialise the present map, which describes the set of CPUs
* actually populated at the present time.
*/
- for (i = 0; i < max_cpus; i++)
- set_cpu_present(i, true);
+ init_cpu_present(&cpu_possible_map);

/*
* Initialise the SCU and wake up the secondary core using
diff --git a/arch/arm/mach-realview/platsmp.c b/arch/arm/mach-realview/platsmp.c
index 963bf0d..00666be 100644
--- a/arch/arm/mach-realview/platsmp.c
+++ b/arch/arm/mach-realview/platsmp.c
@@ -68,14 +68,11 @@ void __init smp_init_cpus(void)

void __init platform_smp_prepare_cpus(unsigned int max_cpus)
{
- int i;
-
/*
* Initialise the present map, which describes the set of CPUs
* actually populated at the present time.
*/
- for (i = 0; i < max_cpus; i++)
- set_cpu_present(i, true);
+ init_cpu_present(&cpu_possible_map);

scu_enable(scu_base_addr());

diff --git a/arch/arm/mach-shmobile/platsmp.c b/arch/arm/mach-shmobile/platsmp.c
index f3888fe..ca5b523 100644
--- a/arch/arm/mach-shmobile/platsmp.c
+++ b/arch/arm/mach-shmobile/platsmp.c
@@ -64,10 +64,7 @@ void __init smp_init_cpus(void)

void __init platform_smp_prepare_cpus(unsigned int max_cpus)
{
- int i;
-
- for (i = 0; i < max_cpus; i++)
- set_cpu_present(i, true);
+ init_cpu_present(&cpu_possible_map);

shmobile_smp_prepare_cpus();
}
diff --git a/arch/arm/mach-tegra/platsmp.c b/arch/arm/mach-tegra/platsmp.c
index b8ae3c9..f11426a 100644
--- a/arch/arm/mach-tegra/platsmp.c
+++ b/arch/arm/mach-tegra/platsmp.c
@@ -129,14 +129,11 @@ void __init smp_init_cpus(void)

void __init platform_smp_prepare_cpus(unsigned int max_cpus)
{
- int i;
-
/*
* Initialise the present map, which describes the set of CPUs
* actually populated at the present time.
*/
- for (i = 0; i < max_cpus; i++)
- set_cpu_present(i, true);
+ init_cpu_present(&cpu_possible_map);

scu_enable(scu_base);
}
diff --git a/arch/arm/mach-ux500/platsmp.c b/arch/arm/mach-ux500/platsmp.c
index 0c527fe..4509b7d 100644
--- a/arch/arm/mach-ux500/platsmp.c
+++ b/arch/arm/mach-ux500/platsmp.c
@@ -172,14 +172,11 @@ void __init smp_init_cpus(void)

void __init platform_smp_prepare_cpus(unsigned int max_cpus)
{
- int i;
-
/*
* Initialise the present map, which describes the set of CPUs
* actually populated at the present time.
*/
- for (i = 0; i < max_cpus; i++)
- set_cpu_present(i, true);
+ init_cpu_present(&cpu_possible_map);

scu_enable(scu_base_addr());
wakeup_secondary();
diff --git a/arch/arm/mach-vexpress/ct-ca9x4.c b/arch/arm/mach-vexpress/ct-ca9x4.c
index 765a71f..c7cd438 100644
--- a/arch/arm/mach-vexpress/ct-ca9x4.c
+++ b/arch/arm/mach-vexpress/ct-ca9x4.c
@@ -229,10 +229,7 @@ static void ct_ca9x4_init_cpu_map(void)

static void ct_ca9x4_smp_enable(unsigned int max_cpus)
{
- int i;
- for (i = 0; i < max_cpus; i++)
- set_cpu_present(i, true);
-
+ init_cpu_present(&cpu_possible_map);
scu_enable(MMIO_P2V(A9_MPCORE_SCU));
}
#endif
--
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.


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