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Commit 42cadd51 authored by Venkata Rao Kakani's avatar Venkata Rao Kakani Committed by Gerrit - the friendly Code Review server
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ARM: memory hotplug: stop cpus while memory hotplug 



Avoid page table corruptions during memory hotplug by
stopping all other cpus.

Change-Id: I527a616c5603b882a43626c746ef0b4dda977202
Signed-off-by: default avatarVenkata Rao Kakani <vkakani@codeaurora.org>
parent 9912a8c4

arch/arm64/mm/mmu.c

+12 −3
Original line number Diff line number Diff line
@@ -656,10 +656,16 @@ static phys_addr_t pgd_pgtable_alloc(void) 
 */

void hotplug_paging(phys_addr_t start, phys_addr_t size)

{



	struct page *pg;

	phys_addr_t pgd_phys = pgd_pgtable_alloc();

	pgd_t *pgd = pgd_set_fixmap(pgd_phys);

	phys_addr_t pgd_phys;

	pgd_t *pgd;

	int cpu;



	for_each_possible_cpu(cpu)

		if (current->cpu != cpu)

			sched_isolate_cpu(cpu);

	pgd_phys = pgd_pgtable_alloc();

	pgd = pgd_set_fixmap(pgd_phys);



	memcpy(pgd, swapper_pg_dir, PAGE_SIZE);
@@ -675,6 +681,9 @@ void hotplug_paging(phys_addr_t start, phys_addr_t size) 
	pg = phys_to_page(pgd_phys);

	pgtable_page_dtor(pg);

	__free_pages(pg, 0);

	for_each_possible_cpu(cpu)

		if (current->cpu != cpu)

			sched_unisolate_cpu_unlocked(cpu);

}



#ifdef CONFIG_MEMORY_HOTREMOVE