The patch titled
Subject: mm: change vunmap to tear down huge KVA mappings
has been removed from the -mm tree. Its filename was
mm-change-vunmap-to-tear-down-huge-kva-mappings.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Toshi Kani <toshi.kani@xxxxxx>
Subject: mm: change vunmap to tear down huge KVA mappings
Change 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.
[akpm@xxxxxxxxxxxxxxxxxxxx: use consistent code layout]
Signed-off-by: Toshi Kani <toshi.kani@xxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxx>
Cc: Robert Elliott <Elliott@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/asm-generic/pgtable.h | 10 ++++++++++
mm/vmalloc.c | 4 ++++
2 files changed, 14 insertions(+)
diff -puN include/asm-generic/pgtable.h~mm-change-vunmap-to-tear-down-huge-kva-mappings include/asm-generic/pgtable.h
--- a/include/asm-generic/pgtable.h~mm-change-vunmap-to-tear-down-huge-kva-mappings
+++ a/include/asm-generic/pgtable.h
@@ -700,6 +700,8 @@ 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)
{
@@ -709,6 +711,14 @@ static inline int pmd_set_huge(pmd_t *pm
{
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 /* !__ASSEMBLY__ */
diff -puN mm/vmalloc.c~mm-change-vunmap-to-tear-down-huge-kva-mappings mm/vmalloc.c
--- a/mm/vmalloc.c~mm-change-vunmap-to-tear-down-huge-kva-mappings
+++ a/mm/vmalloc.c
@@ -75,6 +75,8 @@ static void vunmap_pmd_range(pud_t *pud,
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,
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);
_
Patches currently in -mm which might be from toshi.kani@xxxxxx are
origin.patch
mm-x86-document-return-values-of-mapping-funcs.patch
mtrr-x86-fix-mtrr-lookup-to-handle-inclusive-entry.patch
mtrr-x86-remove-a-wrong-address-check-in-__mtrr_type_lookup.patch
mtrr-x86-fix-mtrr-state-checks-in-mtrr_type_lookup.patch
mtrr-x86-define-mtrr_type_invalid-for-mtrr_type_lookup.patch
mtrr-x86-clean-up-mtrr_type_lookup.patch
mtrr-mm-x86-enhance-mtrr-checks-for-kva-huge-page-mapping.patch
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