Changed vunmap_pmd_range() and vunmap_pud_range() to tear down
huge KVA mappings when they are set. pud_clear_huge() and
pmd_clear_huge() return zero when no-operation is performed,
i.e. huge page mapping was not used.
These changes are only enabled when CONFIG_HAVE_ARCH_HUGE_VMAP
is defined on the architecture.
Signed-off-by: Toshi Kani <toshi.k...@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 bf6e86c..b583235 100644
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -701,6 +701,8 @@ static inline int pmd_protnone(pmd_t pmd)
#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
int pud_set_huge(pud_t *pud, phys_addr_t addr, pgprot_t prot);
int 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 int pud_set_huge(pud_t *pud, phys_addr_t addr, pgprot_t prot)
{
@@ -710,6 +712,8 @@ static inline int pmd_set_huge(pmd_t *pmd, phys_addr_t
addr, pgprot_t prot)
{
return 0;
}
+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 fe1672d..9184cf7 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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