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powerpc/mm/radix: Free PUD table when freeing pagetable

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[ Upstream commit 9ce8853b4a ]

remove_pagetable() isn't freeing PUD table. This causes memory
leak during memory unplug. Fix this.

Fixes: 4b5d62ca17 ("powerpc/mm: add radix__remove_section_mapping()")
Signed-off-by: Bharata B Rao <bharata@linux.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200709131925.922266-3-aneesh.kumar@linux.ibm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Bharata B Rao
2020-07-09 18:49:23 +05:30
committed by Greg Kroah-Hartman
parent 05d976032b
commit aa11151dd8
1 changed files with 16 additions and 0 deletions
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16
arch/powerpc/mm/book3s64/radix_pgtable.c
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@ -700,6 +700,21 @@ static void free_pmd_table(pmd_t *pmd_start, pud_t *pud)
pud_clear(pud);
}
static void free_pud_table(pud_t *pud_start, p4d_t *p4d)
{
pud_t *pud;
int i;
for (i = 0; i < PTRS_PER_PUD; i++) {
pud = pud_start + i;
if (!pud_none(*pud))
return;
}
pud_free(&init_mm, pud_start);
p4d_clear(p4d);
}
struct change_mapping_params {
pte_t *pte;
unsigned long start;
@ -874,6 +889,7 @@ static void __meminit remove_pagetable(unsigned long start, unsigned long end)
pud_base = (pud_t *)p4d_page_vaddr(*p4d);
remove_pud_table(pud_base, addr, next);
free_pud_table(pud_base, p4d);
}
spin_unlock(&init_mm.page_table_lock);