Commit 785285fc authored by Russ Anderson's avatar Russ Anderson Committed by Tony Luck
Browse files

[IA64] Fix large MCA bootmem allocation 



The MCA code allocates bootmem memory for NR_CPUS, regardless
of how many cpus the system actually has.  This change allocates
memory only for cpus that actually exist.

On my test system with NR_CPUS = 1024, reserved memory was reduced by 130944k.

Before: Memory: 27886976k/28111168k available (8282k code, 242304k reserved, 5928k data, 1792k init)
After:  Memory: 28017920k/28111168k available (8282k code, 111360k reserved, 5928k data, 1792k init)

Signed-off-by: default avatarRuss Anderson <rja@sgi.com>
Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
parent 42763935

arch/ia64/kernel/mca.c

+26 −29
Original line number Diff line number Diff line
@@ -17,7 +17,7 @@ 
 * Copyright (C) 2000 Intel

 * Copyright (C) Chuck Fleckenstein <cfleck@co.intel.com>

 *

 * Copyright (C) 1999, 2004 Silicon Graphics, Inc.

 * Copyright (C) 1999, 2004-2008 Silicon Graphics, Inc.

 * Copyright (C) Vijay Chander <vijay@engr.sgi.com>

 *

 * Copyright (C) 2006 FUJITSU LIMITED
@@ -1762,11 +1762,8 @@ format_mca_init_stack(void *mca_data, unsigned long offset, 
/* Caller prevents this from being called after init */

static void * __init_refok mca_bootmem(void)

{

	void *p;



	p = alloc_bootmem(sizeof(struct ia64_mca_cpu) * NR_CPUS +

	                  KERNEL_STACK_SIZE);

	return (void *)ALIGN((unsigned long)p, KERNEL_STACK_SIZE);

	return __alloc_bootmem(sizeof(struct ia64_mca_cpu),

	                    KERNEL_STACK_SIZE, 0);

}



/* Do per-CPU MCA-related initialization.  */
@@ -1774,33 +1771,33 @@ void __cpuinit 
ia64_mca_cpu_init(void *cpu_data)

{

	void *pal_vaddr;

	void *data;

	long sz = sizeof(struct ia64_mca_cpu);

	int cpu = smp_processor_id();

	static int first_time = 1;



	/*

	 * Structure will already be allocated if cpu has been online,

	 * then offlined.

	 */

	if (__per_cpu_mca[cpu]) {

		data = __va(__per_cpu_mca[cpu]);

	} else {

		if (first_time) {

		void *mca_data;

		int cpu;



			data = mca_bootmem();

			first_time = 0;

		mca_data = mca_bootmem();

		for (cpu = 0; cpu < NR_CPUS; cpu++) {

			format_mca_init_stack(mca_data,

					offsetof(struct ia64_mca_cpu, mca_stack),

		} else

			data = page_address(alloc_pages_node(numa_node_id(),

					GFP_KERNEL, get_order(sz)));

		if (!data)

			panic("Could not allocate MCA memory for cpu %d\n",

					cpu);

	}

	format_mca_init_stack(data, offsetof(struct ia64_mca_cpu, mca_stack),

		"MCA", cpu);

			format_mca_init_stack(mca_data,

					offsetof(struct ia64_mca_cpu, init_stack),

	format_mca_init_stack(data, offsetof(struct ia64_mca_cpu, init_stack),

		"INIT", cpu);

			__per_cpu_mca[cpu] = __pa(mca_data);

			mca_data += sizeof(struct ia64_mca_cpu);

		}

	}



	/*

	 * The MCA info structure was allocated earlier and its

	 * physical address saved in __per_cpu_mca[cpu].  Copy that

	 * address * to ia64_mca_data so we can access it as a per-CPU

	 * variable.

	 */

	__get_cpu_var(ia64_mca_data) = __per_cpu_mca[smp_processor_id()];

	__get_cpu_var(ia64_mca_data) = __per_cpu_mca[cpu] = __pa(data);



	/*

	 * Stash away a copy of the PTE needed to map the per-CPU page.

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