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| author | Toshi Kani <toshi.kani@hp.com> | 2015-04-15 00:47:26 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-04-15 01:49:04 +0200 |
| commit | b9820d8f39f816b67112eb7ec5cdc4c1655ff060 (patch) | |
| tree | 7185bfd18a02552345fbcfda941d1dc8c9bdd802 | |
| parent | mm: change ioremap to set up huge I/O mappings (diff) | |
| download | linux-b9820d8f39f816b67112eb7ec5cdc4c1655ff060.tar.xz linux-b9820d8f39f816b67112eb7ec5cdc4c1655ff060.zip | |
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@linux-foundation.org: use consistent code layout]
Signed-off-by: Toshi Kani <toshi.kani@hp.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Robert Elliott <Elliott@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | include/asm-generic/pgtable.h | 10 | ||||
| -rw-r--r-- | mm/vmalloc.c | 4 |
2 files changed, 14 insertions, 0 deletions
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h index 9fb7dc7ca7f4..39f1d6a2b04d 100644 --- a/include/asm-generic/pgtable.h +++ b/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 *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 /* !__ASSEMBLY__ */ diff --git a/mm/vmalloc.c b/mm/vmalloc.c index a48cd061f16f..a5bbdd3b5d67 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); |