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Commit 96619fc1 authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
Browse files

s390/smp: reduce memory consumption of pcpu_devices array 



Remove the embedded struct cpu from struct pcpu and replace it with a
pointer instead. The struct cpu now gets allocated when a new cpu gets
detected.

The size of the pcpu_devices array (NR_CPUS * sizeof(struct pcpu)) gets
reduced by nearly 120KB.

Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 03439e7d

arch/s390/kernel/smp.c

+9 −4
Original line number Diff line number Diff line
@@ -59,7 +59,7 @@ enum { 
};



struct pcpu {

	struct cpu cpu;

	struct cpu *cpu;

	struct _lowcore *lowcore;	/* lowcore page(s) for the cpu */

	unsigned long async_stack;	/* async stack for the cpu */

	unsigned long panic_stack;	/* panic stack for the cpu */
@@ -958,7 +958,7 @@ static int smp_cpu_notify(struct notifier_block *self, unsigned long action, 
			  void *hcpu)

{

	unsigned int cpu = (unsigned int)(long)hcpu;

	struct cpu *c = &pcpu_devices[cpu].cpu;

	struct cpu *c = pcpu_devices[cpu].cpu;

	struct device *s = &c->dev;

	int err = 0;
@@ -975,10 +975,15 @@ static int smp_cpu_notify(struct notifier_block *self, unsigned long action, 


static int smp_add_present_cpu(int cpu)

{

	struct cpu *c = &pcpu_devices[cpu].cpu;

	struct device *s = &c->dev;

	struct device *s;

	struct cpu *c;

	int rc;



	c = kzalloc(sizeof(*c), GFP_KERNEL);

	if (!c)

		return -ENOMEM;

	pcpu_devices[cpu].cpu = c;

	s = &c->dev;

	c->hotpluggable = 1;

	rc = register_cpu(c, cpu);

	if (rc)