[PATCH 0/5] ARM: DT: remove redundant DT related code

[PATCH 0/5] ARM: DT: remove redundant DT related code

[Sudeep KarkadaNagesha]

From: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>

Hi,

As part of my changes to remove duplicate code for parsing cpu nodes
in the device tree, I found few unnecessary code mostly around smp_init_cpus.
Most of the ARM Cortex A9 based platforms use SCU to get the number of cpus
while many others depend on the device tree.

Even on DT based platforms using SCU, they can be made to depend on DT
to cpu count simplifying smp_init_cpus. In fact arm_dt_init_cpu_maps called
before smp_init_cpus, already does the device tree parsing, validating
nr_cpu_ids and setting the cpu_possible_mask appropriately. 

However this series targets only the platforms using DT for cpu count
(i.e. not using SCU)

Regards,
Sudeep

Sudeep KarkadaNagesha (5):
  ARM: keystone: remove redundant smp_init_cpus definition
  ARM: vexpress: remove redundant vexpress_dt_cpus_num to get cpu count
  ARM: mach-mvebu: remove redundant DT parsing and validation
  ARM: highbank: remove redundant smp_init_cpus definition
  ARM: zynq: remove unnecessary setting of cpu_present_mask

 arch/arm/mach-highbank/platsmp.c | 22 ----------------------
 arch/arm/mach-keystone/platsmp.c |  1 -
 arch/arm/mach-mvebu/platsmp.c    | 19 +------------------
 arch/arm/mach-vexpress/platsmp.c | 32 +-------------------------------
 arch/arm/mach-zynq/platsmp.c     |  9 ---------
 5 files changed, 2 insertions(+), 81 deletions(-)

-- 
1.8.1.2

[PATCH 1/5] ARM: keystone: remove redundant smp_init_cpus definition

[Sudeep KarkadaNagesha]

From: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>

arm_dt_init_cpu_maps is called before smp_init_cpus. It makes the
platform/SoC definition of smp_init_cpus unnecessary.

Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
---
 arch/arm/mach-keystone/platsmp.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/arm/mach-keystone/platsmp.c b/arch/arm/mach-keystone/platsmp.c
index 14378e3..c122961 100644
--- a/arch/arm/mach-keystone/platsmp.c
+++ b/arch/arm/mach-keystone/platsmp.c
@@ -38,6 +38,5 @@ static int keystone_smp_boot_secondary(unsigned int cpu,
 }
 
 struct smp_operations keystone_smp_ops __initdata = {
-	.smp_init_cpus		= arm_dt_init_cpu_maps,
 	.smp_boot_secondary	= keystone_smp_boot_secondary,
 };
-- 
1.8.1.2

[PATCH 1/5] ARM: keystone: remove redundant smp_init_cpus definition

[Santosh Shilimkar]

On Tuesday 23 July 2013 07:32 AM, Sudeep KarkadaNagesha wrote:
> From: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
> 
> arm_dt_init_cpu_maps is called before smp_init_cpus. It makes the
> platform/SoC definition of smp_init_cpus unnecessary.
> 
> Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
> Signed-off-by: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
> ---
Looks good, thanks. I will pick this up.

Regards,
Santosh

[PATCH 2/5] ARM: vexpress: remove redundant vexpress_dt_cpus_num to get cpu count

[Sudeep KarkadaNagesha]

From: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>

arm_dt_init_cpu_maps parses the device tree, validates and sets the
cpu_possible_mask appropriately. It is unnecessary to do another DT
parse to get the number of cpus, use num_possible_cpus instead.

This patch also removes setting cpu_present_mask as platforms should
only re-initialize it in smp_prepare_cpus() if present != possible.

Acked-by: Pawel Moll <pawel.moll@arm.com>
Signed-off-by: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
---
 arch/arm/mach-vexpress/platsmp.c | 32 +-------------------------------
 1 file changed, 1 insertion(+), 31 deletions(-)

diff --git a/arch/arm/mach-vexpress/platsmp.c b/arch/arm/mach-vexpress/platsmp.c
index 993c9ae..4a2d8c4 100644
--- a/arch/arm/mach-vexpress/platsmp.c
+++ b/arch/arm/mach-vexpress/platsmp.c
@@ -77,39 +77,13 @@ void __init vexpress_dt_smp_map_io(void)
 		WARN_ON(of_scan_flat_dt(vexpress_dt_find_scu, NULL));
 }
 
-static int __init vexpress_dt_cpus_num(unsigned long node, const char *uname,
-		int depth, void *data)
-{
-	static int prev_depth = -1;
-	static int nr_cpus = -1;
-
-	if (prev_depth > depth && nr_cpus > 0)
-		return nr_cpus;
-
-	if (nr_cpus < 0 && strcmp(uname, "cpus") == 0)
-		nr_cpus = 0;
-
-	if (nr_cpus >= 0) {
-		const char *device_type = of_get_flat_dt_prop(node,
-				"device_type", NULL);
-
-		if (device_type && strcmp(device_type, "cpu") == 0)
-			nr_cpus++;
-	}
-
-	prev_depth = depth;
-
-	return 0;
-}
-
 static void __init vexpress_dt_smp_init_cpus(void)
 {
 	int ncores = 0, i;
 
 	switch (vexpress_dt_scu) {
 	case GENERIC_SCU:
-		ncores = of_scan_flat_dt(vexpress_dt_cpus_num, NULL);
-		break;
+		return;
 	case CORTEX_A9_SCU:
 		ncores = scu_get_core_count(vexpress_dt_cortex_a9_scu_base);
 		break;
@@ -133,12 +107,8 @@ static void __init vexpress_dt_smp_init_cpus(void)
 
 static void __init vexpress_dt_smp_prepare_cpus(unsigned int max_cpus)
 {
-	int i;
-
 	switch (vexpress_dt_scu) {
 	case GENERIC_SCU:
-		for (i = 0; i < max_cpus; i++)
-			set_cpu_present(i, true);
 		break;
 	case CORTEX_A9_SCU:
 		scu_enable(vexpress_dt_cortex_a9_scu_base);
-- 
1.8.1.2

[PATCH 2/5] ARM: vexpress: remove redundant vexpress_dt_cpus_num to get cpu count

[Sudeep KarkadaNagesha]

Hi Pawel,

On 23/07/13 12:32, Sudeep KarkadaNagesha wrote:
> From: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
> 
> arm_dt_init_cpu_maps parses the device tree, validates and sets the
> cpu_possible_mask appropriately. It is unnecessary to do another DT
> parse to get the number of cpus, use num_possible_cpus instead.
> 
> This patch also removes setting cpu_present_mask as platforms should
> only re-initialize it in smp_prepare_cpus() if present != possible.
> 
Can you pick this patch for v3.12 ?

Regards,
Sudeep

> Acked-by: Pawel Moll <pawel.moll@arm.com>
> Signed-off-by: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
> ---
>  arch/arm/mach-vexpress/platsmp.c | 32 +-------------------------------
>  1 file changed, 1 insertion(+), 31 deletions(-)
> 
> diff --git a/arch/arm/mach-vexpress/platsmp.c b/arch/arm/mach-vexpress/platsmp.c
> index 993c9ae..4a2d8c4 100644
> --- a/arch/arm/mach-vexpress/platsmp.c
> +++ b/arch/arm/mach-vexpress/platsmp.c
> @@ -77,39 +77,13 @@ void __init vexpress_dt_smp_map_io(void)
>  		WARN_ON(of_scan_flat_dt(vexpress_dt_find_scu, NULL));
>  }
>  
> -static int __init vexpress_dt_cpus_num(unsigned long node, const char *uname,
> -		int depth, void *data)
> -{
> -	static int prev_depth = -1;
> -	static int nr_cpus = -1;
> -
> -	if (prev_depth > depth && nr_cpus > 0)
> -		return nr_cpus;
> -
> -	if (nr_cpus < 0 && strcmp(uname, "cpus") == 0)
> -		nr_cpus = 0;
> -
> -	if (nr_cpus >= 0) {
> -		const char *device_type = of_get_flat_dt_prop(node,
> -				"device_type", NULL);
> -
> -		if (device_type && strcmp(device_type, "cpu") == 0)
> -			nr_cpus++;
> -	}
> -
> -	prev_depth = depth;
> -
> -	return 0;
> -}
> -
>  static void __init vexpress_dt_smp_init_cpus(void)
>  {
>  	int ncores = 0, i;
>  
>  	switch (vexpress_dt_scu) {
>  	case GENERIC_SCU:
> -		ncores = of_scan_flat_dt(vexpress_dt_cpus_num, NULL);
> -		break;
> +		return;
>  	case CORTEX_A9_SCU:
>  		ncores = scu_get_core_count(vexpress_dt_cortex_a9_scu_base);
>  		break;
> @@ -133,12 +107,8 @@ static void __init vexpress_dt_smp_init_cpus(void)
>  
>  static void __init vexpress_dt_smp_prepare_cpus(unsigned int max_cpus)
>  {
> -	int i;
> -
>  	switch (vexpress_dt_scu) {
>  	case GENERIC_SCU:
> -		for (i = 0; i < max_cpus; i++)
> -			set_cpu_present(i, true);
>  		break;
>  	case CORTEX_A9_SCU:
>  		scu_enable(vexpress_dt_cortex_a9_scu_base);
> 

[PATCH 3/5] ARM: mach-mvebu: remove redundant DT parsing and validation

[Sudeep KarkadaNagesha]

From: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>

arm_dt_init_cpu_maps parses the device tree, validates and sets the
cpu_possible_mask appropriately. It is unnecessary to do another DT
parse to get the number of cpus, use num_possible_cpus instead.

Cc: Gregory Clement <gregory.clement@free-electrons.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
---
 arch/arm/mach-mvebu/platsmp.c | 19 +------------------
 1 file changed, 1 insertion(+), 18 deletions(-)

diff --git a/arch/arm/mach-mvebu/platsmp.c b/arch/arm/mach-mvebu/platsmp.c
index ce81d30..2e4508a 100644
--- a/arch/arm/mach-mvebu/platsmp.c
+++ b/arch/arm/mach-mvebu/platsmp.c
@@ -87,28 +87,11 @@ static int armada_xp_boot_secondary(unsigned int cpu, struct task_struct *idle)
 
 static void __init armada_xp_smp_init_cpus(void)
 {
-	struct device_node *np;
-	unsigned int i, ncores;
+	unsigned int ncores = num_possible_cpus();
 
-	np = of_find_node_by_name(NULL, "cpus");
-	if (!np)
-		panic("No 'cpus' node found\n");
-
-	ncores = of_get_child_count(np);
 	if (ncores == 0 || ncores > ARMADA_XP_MAX_CPUS)
 		panic("Invalid number of CPUs in DT\n");
 
-	/* Limit possible CPUs to defconfig */
-	if (ncores > nr_cpu_ids) {
-		pr_warn("SMP: %d CPUs physically present. Only %d configured.",
-			ncores, nr_cpu_ids);
-		pr_warn("Clipping CPU count to %d\n", nr_cpu_ids);
-		ncores = nr_cpu_ids;
-	}
-
-	for (i = 0; i < ncores; i++)
-		set_cpu_possible(i, true);
-
 	set_smp_cross_call(armada_mpic_send_doorbell);
 }
 
-- 
1.8.1.2

[PATCH 3/5] ARM: mach-mvebu: remove redundant DT parsing and validation

[Sudeep KarkadaNagesha]

On 23/07/13 12:32, Sudeep KarkadaNagesha wrote:
> From: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
> 
> arm_dt_init_cpu_maps parses the device tree, validates and sets the
> cpu_possible_mask appropriately. It is unnecessary to do another DT
> parse to get the number of cpus, use num_possible_cpus instead.
> 
Hi Gregory,

Does this change look fine ?
If OK, not sure if you prefer to pick up this or want me to send to
arm-soc guys.

Regards,
Sudeep

> Cc: Gregory Clement <gregory.clement@free-electrons.com>
> Cc: Jason Cooper <jason@lakedaemon.net>
> Cc: Andrew Lunn <andrew@lunn.ch>
> Signed-off-by: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
> ---
>  arch/arm/mach-mvebu/platsmp.c | 19 +------------------
>  1 file changed, 1 insertion(+), 18 deletions(-)
> 
> diff --git a/arch/arm/mach-mvebu/platsmp.c b/arch/arm/mach-mvebu/platsmp.c
> index ce81d30..2e4508a 100644
> --- a/arch/arm/mach-mvebu/platsmp.c
> +++ b/arch/arm/mach-mvebu/platsmp.c
> @@ -87,28 +87,11 @@ static int armada_xp_boot_secondary(unsigned int cpu, struct task_struct *idle)
>  
>  static void __init armada_xp_smp_init_cpus(void)
>  {
> -	struct device_node *np;
> -	unsigned int i, ncores;
> +	unsigned int ncores = num_possible_cpus();
>  
> -	np = of_find_node_by_name(NULL, "cpus");
> -	if (!np)
> -		panic("No 'cpus' node found\n");
> -
> -	ncores = of_get_child_count(np);
>  	if (ncores == 0 || ncores > ARMADA_XP_MAX_CPUS)
>  		panic("Invalid number of CPUs in DT\n");
>  
> -	/* Limit possible CPUs to defconfig */
> -	if (ncores > nr_cpu_ids) {
> -		pr_warn("SMP: %d CPUs physically present. Only %d configured.",
> -			ncores, nr_cpu_ids);
> -		pr_warn("Clipping CPU count to %d\n", nr_cpu_ids);
> -		ncores = nr_cpu_ids;
> -	}
> -
> -	for (i = 0; i < ncores; i++)
> -		set_cpu_possible(i, true);
> -
>  	set_smp_cross_call(armada_mpic_send_doorbell);
>  }
>  
> 

[PATCH 3/5] ARM: mach-mvebu: remove redundant DT parsing and validation

[Gregory CLEMENT]

On 08/08/2013 16:54, Sudeep KarkadaNagesha wrote:
> On 23/07/13 12:32, Sudeep KarkadaNagesha wrote:
>> From: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
>>
>> arm_dt_init_cpu_maps parses the device tree, validates and sets the
>> cpu_possible_mask appropriately. It is unnecessary to do another DT
>> parse to get the number of cpus, use num_possible_cpus instead.
>>
> Hi Gregory,
> 
> Does this change look fine ?

Yes it is a nice cleanup.

and I have just test it on an Armada XP DB board.

So you can add

my Acked-by: Gregory Clement <gregory.clement@free-electrons.com>

> If OK, not sure if you prefer to pick up this or want me to send to
> arm-soc guys.

I think it is better if we pick up this patch as it only touch a file
belonging to mvebu.

Jason,
do you agree to pick it up and then push it to in your next (and maybe
last) pull request?

Thanks,

> 
> Regards,
> Sudeep
> 
>> Cc: Gregory Clement <gregory.clement@free-electrons.com>
>> Cc: Jason Cooper <jason@lakedaemon.net>
>> Cc: Andrew Lunn <andrew@lunn.ch>
>> Signed-off-by: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
>> ---
>>  arch/arm/mach-mvebu/platsmp.c | 19 +------------------
>>  1 file changed, 1 insertion(+), 18 deletions(-)
>>
>> diff --git a/arch/arm/mach-mvebu/platsmp.c b/arch/arm/mach-mvebu/platsmp.c
>> index ce81d30..2e4508a 100644
>> --- a/arch/arm/mach-mvebu/platsmp.c
>> +++ b/arch/arm/mach-mvebu/platsmp.c
>> @@ -87,28 +87,11 @@ static int armada_xp_boot_secondary(unsigned int cpu, struct task_struct *idle)
>>  
>>  static void __init armada_xp_smp_init_cpus(void)
>>  {
>> -	struct device_node *np;
>> -	unsigned int i, ncores;
>> +	unsigned int ncores = num_possible_cpus();
>>  
>> -	np = of_find_node_by_name(NULL, "cpus");
>> -	if (!np)
>> -		panic("No 'cpus' node found\n");
>> -
>> -	ncores = of_get_child_count(np);
>>  	if (ncores == 0 || ncores > ARMADA_XP_MAX_CPUS)
>>  		panic("Invalid number of CPUs in DT\n");
>>  
>> -	/* Limit possible CPUs to defconfig */
>> -	if (ncores > nr_cpu_ids) {
>> -		pr_warn("SMP: %d CPUs physically present. Only %d configured.",
>> -			ncores, nr_cpu_ids);
>> -		pr_warn("Clipping CPU count to %d\n", nr_cpu_ids);
>> -		ncores = nr_cpu_ids;
>> -	}
>> -
>> -	for (i = 0; i < ncores; i++)
>> -		set_cpu_possible(i, true);
>> -
>>  	set_smp_cross_call(armada_mpic_send_doorbell);
>>  }
>>  
>>
> 
> 


-- 
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com

[PATCH 3/5] ARM: mach-mvebu: remove redundant DT parsing and validation

[Jason Cooper]

On Thu, Aug 08, 2013 at 05:19:43PM +0200, Gregory CLEMENT wrote:
> On 08/08/2013 16:54, Sudeep KarkadaNagesha wrote:
> > On 23/07/13 12:32, Sudeep KarkadaNagesha wrote:
> >> From: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
> >>
> >> arm_dt_init_cpu_maps parses the device tree, validates and sets the
> >> cpu_possible_mask appropriately. It is unnecessary to do another DT
> >> parse to get the number of cpus, use num_possible_cpus instead.
> >>
> > Hi Gregory,
> > 
> > Does this change look fine ?
> 
> Yes it is a nice cleanup.
> 
> and I have just test it on an Armada XP DB board.
> 
> So you can add
> 
> my Acked-by: Gregory Clement <gregory.clement@free-electrons.com>
> 
> > If OK, not sure if you prefer to pick up this or want me to send to
> > arm-soc guys.
> 
> I think it is better if we pick up this patch as it only touch a file
> belonging to mvebu.
> 
> Jason,
> do you agree to pick it up and then push it to in your next (and maybe
> last) pull request?

Yep.

thx,

Jason.

[PATCH 3/5] ARM: mach-mvebu: remove redundant DT parsing and validation

[Jason Cooper]

On Tue, Jul 23, 2013 at 12:32:42PM +0100, Sudeep KarkadaNagesha wrote:
> From: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
> 
> arm_dt_init_cpu_maps parses the device tree, validates and sets the
> cpu_possible_mask appropriately. It is unnecessary to do another DT
> parse to get the number of cpus, use num_possible_cpus instead.
> 
> Cc: Gregory Clement <gregory.clement@free-electrons.com>
> Cc: Jason Cooper <jason@lakedaemon.net>
> Cc: Andrew Lunn <andrew@lunn.ch>
> Signed-off-by: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
> ---
>  arch/arm/mach-mvebu/platsmp.c | 19 +------------------
>  1 file changed, 1 insertion(+), 18 deletions(-)

Applied to mvebu/soc with Gregory's Ack

thx,

Jason.

[PATCH 4/5] ARM: highbank: remove redundant smp_init_cpus definition

[Sudeep KarkadaNagesha]

From: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>

arm_dt_init_cpu_maps is called before smp_init_cpus, which sets the
cpu_possible_mask appropriately. Since highbank_smp_init_cpus does
nothing extra, it can be removed.

Cc: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
---
 arch/arm/mach-highbank/platsmp.c | 22 ----------------------
 1 file changed, 22 deletions(-)

diff --git a/arch/arm/mach-highbank/platsmp.c b/arch/arm/mach-highbank/platsmp.c
index 32d75cf5..25b0bae 100644
--- a/arch/arm/mach-highbank/platsmp.c
+++ b/arch/arm/mach-highbank/platsmp.c
@@ -31,27 +31,6 @@ static int highbank_boot_secondary(unsigned int cpu, struct task_struct *idle)
 	return 0;
 }
 
-/*
- * Initialise the CPU possible map early - this describes the CPUs
- * which may be present or become present in the system.
- */
-static void __init highbank_smp_init_cpus(void)
-{
-	unsigned int i, ncores = 4;
-
-	/* sanity check */
-	if (ncores > NR_CPUS) {
-		printk(KERN_WARNING
-		       "highbank: no. of cores (%d) greater than configured "
-		       "maximum of %d - clipping\n",
-		       ncores, NR_CPUS);
-		ncores = NR_CPUS;
-	}
-
-	for (i = 0; i < ncores; i++)
-		set_cpu_possible(i, true);
-}
-
 static void __init highbank_smp_prepare_cpus(unsigned int max_cpus)
 {
 	if (scu_base_addr)
@@ -59,7 +38,6 @@ static void __init highbank_smp_prepare_cpus(unsigned int max_cpus)
 }
 
 struct smp_operations highbank_smp_ops __initdata = {
-	.smp_init_cpus		= highbank_smp_init_cpus,
 	.smp_prepare_cpus	= highbank_smp_prepare_cpus,
 	.smp_boot_secondary	= highbank_boot_secondary,
 #ifdef CONFIG_HOTPLUG_CPU
-- 
1.8.1.2

[PATCH 4/5] ARM: highbank: remove redundant smp_init_cpus definition

[Rob Herring]

On 07/23/2013 06:32 AM, Sudeep KarkadaNagesha wrote:
> From: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
> 
> arm_dt_init_cpu_maps is called before smp_init_cpus, which sets the
> cpu_possible_mask appropriately. Since highbank_smp_init_cpus does
> nothing extra, it can be removed.

This is all going to get removed in my PSCI support series. Trying to
get an updated version out soon.

Rob

> Cc: Rob Herring <rob.herring@calxeda.com>
> Signed-off-by: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
> ---
>  arch/arm/mach-highbank/platsmp.c | 22 ----------------------
>  1 file changed, 22 deletions(-)
> 
> diff --git a/arch/arm/mach-highbank/platsmp.c b/arch/arm/mach-highbank/platsmp.c
> index 32d75cf5..25b0bae 100644
> --- a/arch/arm/mach-highbank/platsmp.c
> +++ b/arch/arm/mach-highbank/platsmp.c
> @@ -31,27 +31,6 @@ static int highbank_boot_secondary(unsigned int cpu, struct task_struct *idle)
>  	return 0;
>  }
>  
> -/*
> - * Initialise the CPU possible map early - this describes the CPUs
> - * which may be present or become present in the system.
> - */
> -static void __init highbank_smp_init_cpus(void)
> -{
> -	unsigned int i, ncores = 4;
> -
> -	/* sanity check */
> -	if (ncores > NR_CPUS) {
> -		printk(KERN_WARNING
> -		       "highbank: no. of cores (%d) greater than configured "
> -		       "maximum of %d - clipping\n",
> -		       ncores, NR_CPUS);
> -		ncores = NR_CPUS;
> -	}
> -
> -	for (i = 0; i < ncores; i++)
> -		set_cpu_possible(i, true);
> -}
> -
>  static void __init highbank_smp_prepare_cpus(unsigned int max_cpus)
>  {
>  	if (scu_base_addr)
> @@ -59,7 +38,6 @@ static void __init highbank_smp_prepare_cpus(unsigned int max_cpus)
>  }
>  
>  struct smp_operations highbank_smp_ops __initdata = {
> -	.smp_init_cpus		= highbank_smp_init_cpus,
>  	.smp_prepare_cpus	= highbank_smp_prepare_cpus,
>  	.smp_boot_secondary	= highbank_boot_secondary,
>  #ifdef CONFIG_HOTPLUG_CPU
> 

[PATCH 4/5] ARM: highbank: remove redundant smp_init_cpus definition

[Sudeep KarkadaNagesha]

On 23/07/13 16:03, Rob Herring wrote:
> On 07/23/2013 06:32 AM, Sudeep KarkadaNagesha wrote:
>> From: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
>>
>> arm_dt_init_cpu_maps is called before smp_init_cpus, which sets the
>> cpu_possible_mask appropriately. Since highbank_smp_init_cpus does
>> nothing extra, it can be removed.
> 
> This is all going to get removed in my PSCI support series. Trying to
> get an updated version out soon.
> 
Thanks for the update.

Regards,
Sudeep

[PATCH 5/5] ARM: zynq: remove unnecessary setting of cpu_present_mask

[Sudeep KarkadaNagesha]

From: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>

This patch also removes setting cpu_present_mask as platforms should
only re-initialize it in smp_prepare_cpus() if present != possible.

Cc: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
---
 arch/arm/mach-zynq/platsmp.c | 9 ---------
 1 file changed, 9 deletions(-)

diff --git a/arch/arm/mach-zynq/platsmp.c b/arch/arm/mach-zynq/platsmp.c
index 689fbbc..ae121b8 100644
--- a/arch/arm/mach-zynq/platsmp.c
+++ b/arch/arm/mach-zynq/platsmp.c
@@ -114,15 +114,6 @@ static void __init zynq_smp_init_cpus(void)
 
 static void __init zynq_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);
-
 	scu_enable(zynq_scu_base);
 }
 
-- 
1.8.1.2

[PATCH 0/5] ARM: DT: remove redundant DT related code

[Michal Simek]

On 07/23/2013 01:32 PM, Sudeep KarkadaNagesha wrote:
> From: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
> 
> Hi,
> 
> As part of my changes to remove duplicate code for parsing cpu nodes
> in the device tree, I found few unnecessary code mostly around smp_init_cpus.
> Most of the ARM Cortex A9 based platforms use SCU to get the number of cpus
> while many others depend on the device tree.
> 
> Even on DT based platforms using SCU, they can be made to depend on DT
> to cpu count simplifying smp_init_cpus. In fact arm_dt_init_cpu_maps called
> before smp_init_cpus, already does the device tree parsing, validating
> nr_cpu_ids and setting the cpu_possible_mask appropriately. 
> 
> However this series targets only the platforms using DT for cpu count
> (i.e. not using SCU)

Just a note. Zynq is using SCU to get cpu count not DT.

Thanks,
Michal

-- 
Michal Simek, Ing. (M.Eng), OpenPGP -> KeyID: FE3D1F91
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel - Microblaze cpu - http://www.monstr.eu/fdt/
Maintainer of Linux kernel - Xilinx Zynq ARM architecture
Microblaze U-BOOT custodian and responsible for u-boot arm zynq platform


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[PATCH 0/5] ARM: DT: remove redundant DT related code

[Sudeep KarkadaNagesha]

On 23/07/13 13:31, Michal Simek wrote:
> On 07/23/2013 01:32 PM, Sudeep KarkadaNagesha wrote:
>> From: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
>>
>> Hi,
>>
>> As part of my changes to remove duplicate code for parsing cpu nodes
>> in the device tree, I found few unnecessary code mostly around smp_init_cpus.
>> Most of the ARM Cortex A9 based platforms use SCU to get the number of cpus
>> while many others depend on the device tree.
>>
>> Even on DT based platforms using SCU, they can be made to depend on DT
>> to cpu count simplifying smp_init_cpus. In fact arm_dt_init_cpu_maps called
>> before smp_init_cpus, already does the device tree parsing, validating
>> nr_cpu_ids and setting the cpu_possible_mask appropriately. 
>>
>> However this series targets only the platforms using DT for cpu count
>> (i.e. not using SCU)
> 
> Just a note. Zynq is using SCU to get cpu count not DT.
> 
Correct, when I saw that vexpress and zynq were only 2 platforms
setting cpu_present_mask which is unnecessary, I added Zynq last minute
to this series.

Regards,
Sudeep

[PATCH 0/5] ARM: DT: remove redundant DT related code

[Nicolas Pitre]

On Tue, 23 Jul 2013, Sudeep KarkadaNagesha wrote:

> From: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
> 
> Hi,
> 
> As part of my changes to remove duplicate code for parsing cpu nodes
> in the device tree, I found few unnecessary code mostly around smp_init_cpus.
> Most of the ARM Cortex A9 based platforms use SCU to get the number of cpus
> while many others depend on the device tree.
> 
> Even on DT based platforms using SCU, they can be made to depend on DT
> to cpu count simplifying smp_init_cpus. In fact arm_dt_init_cpu_maps called
> before smp_init_cpus, already does the device tree parsing, validating
> nr_cpu_ids and setting the cpu_possible_mask appropriately. 
> 
> However this series targets only the platforms using DT for cpu count
> (i.e. not using SCU)
> 
> Regards,
> Sudeep
For the whole series:

Acked-by: Nicolas Pitre <nico@linaro.org>


> Sudeep KarkadaNagesha (5):
>   ARM: keystone: remove redundant smp_init_cpus definition
>   ARM: vexpress: remove redundant vexpress_dt_cpus_num to get cpu count
>   ARM: mach-mvebu: remove redundant DT parsing and validation
>   ARM: highbank: remove redundant smp_init_cpus definition
>   ARM: zynq: remove unnecessary setting of cpu_present_mask
> 
>  arch/arm/mach-highbank/platsmp.c | 22 ----------------------
>  arch/arm/mach-keystone/platsmp.c |  1 -
>  arch/arm/mach-mvebu/platsmp.c    | 19 +------------------
>  arch/arm/mach-vexpress/platsmp.c | 32 +-------------------------------
>  arch/arm/mach-zynq/platsmp.c     |  9 ---------
>  5 files changed, 2 insertions(+), 81 deletions(-)
> 
> -- 
> 1.8.1.2
> 
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel at lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> 

[PATCH 0/5] ARM: DT: remove redundant DT related code

[Sudeep KarkadaNagesha]

On 23/07/13 20:45, Nicolas Pitre wrote:
> On Tue, 23 Jul 2013, Sudeep KarkadaNagesha wrote:
> 
>> From: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
>>
>> Hi,
>>
>> As part of my changes to remove duplicate code for parsing cpu nodes
>> in the device tree, I found few unnecessary code mostly around smp_init_cpus.
>> Most of the ARM Cortex A9 based platforms use SCU to get the number of cpus
>> while many others depend on the device tree.
>>
>> Even on DT based platforms using SCU, they can be made to depend on DT
>> to cpu count simplifying smp_init_cpus. In fact arm_dt_init_cpu_maps called
>> before smp_init_cpus, already does the device tree parsing, validating
>> nr_cpu_ids and setting the cpu_possible_mask appropriately. 
>>
>> However this series targets only the platforms using DT for cpu count
>> (i.e. not using SCU)
>>
>> Regards,
>> Sudeep
> For the whole series:
> 
> Acked-by: Nicolas Pitre <nico@linaro.org>
> 
Thanks for the review.

Regards,
Sudeep