evie/android_kernel_oneplus_msm8998
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

ARM: memory hotplug: stop cpus while memory hotplug

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

Change-Id: I527a616c5603b882a43626c746ef0b4dda977202
Signed-off-by: Venkata Rao Kakani <vkakani@codeaurora.org>
This commit is contained in:
Venkata Rao Kakani 2018-06-08 10:51:58 +05:30 • committed by Gerrit - the friendly Code Review server
parent 9912a8c48b
commit 42cadd5165
1 changed files with 12 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

15
arch/arm64/mm/mmu.c
View file

@ -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