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Subject[PATCH v2 4/7] mm: Change vunmap to tear down huge KVA mappings
Date
Change vunmap_pmd_range() and vunmap_pud_range() to tear down
huge KVA mappings when they are set.

These changes are only enabled when CONFIG_HAVE_ARCH_HUGE_VMAP
is defined.

Signed-off-by: Toshi Kani <toshi.kani@hp.com>
---
include/asm-generic/pgtable.h | 4 ++++
mm/vmalloc.c | 4 ++++
2 files changed, 8 insertions(+)

diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index 7dc3838..1204ea6 100644
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -850,9 +850,13 @@ static inline void pmdp_set_numa(struct mm_struct *mm, unsigned long addr,
#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
void pud_set_huge(pud_t *pud, phys_addr_t addr, pgprot_t prot);
void pmd_set_huge(pmd_t *pmd, phys_addr_t addr, pgprot_t prot);
+int pud_clear_huge(pud_t *pud);
+int pmd_clear_huge(pmd_t *pmd);
#else /* !CONFIG_HAVE_ARCH_HUGE_VMAP */
static inline void pud_set_huge(pud_t *pud, phys_addr_t addr, pgprot_t prot) { }
static inline void pmd_set_huge(pmd_t *pmd, phys_addr_t addr, pgprot_t prot) { }
+static inline int pud_clear_huge(pud_t *pud) { return 0; }
+static inline int pmd_clear_huge(pmd_t *pmd) { return 0; }
#endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */

#endif /* _ASM_GENERIC_PGTABLE_H */
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 40ea214..dd53a9d 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -75,6 +75,8 @@ static void vunmap_pmd_range(pud_t *pud, unsigned long addr, unsigned long end)
pmd = pmd_offset(pud, addr);
do {
next = pmd_addr_end(addr, end);
+ if (pmd_clear_huge(pmd))
+ continue;
if (pmd_none_or_clear_bad(pmd))
continue;
vunmap_pte_range(pmd, addr, next);
@@ -89,6 +91,8 @@ static void vunmap_pud_range(pgd_t *pgd, unsigned long addr, unsigned long end)
pud = pud_offset(pgd, addr);
do {
next = pud_addr_end(addr, end);
+ if (pud_clear_huge(pud))
+ continue;
if (pud_none_or_clear_bad(pud))
continue;
vunmap_pmd_range(pud, addr, next);

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