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| author | Punit Agrawal <punit.agrawal@arm.com> | 2017-07-06 15:39:42 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-07-06 16:24:34 -0700 |
| commit | 7868a2087ec13ec4a5df0c5e00999863be132ba8 (patch) | |
| tree | ae49686ff18e3e90cb644c22a4fb92d0f8bd0e2a /fs/userfaultfd.c | |
| parent | d63206ee32b6e64b0e12d46e5d6004afd9913713 (diff) | |
| download | lwn-7868a2087ec13ec4a5df0c5e00999863be132ba8.tar.gz lwn-7868a2087ec13ec4a5df0c5e00999863be132ba8.zip | |
mm/hugetlb: add size parameter to huge_pte_offset()
A poisoned or migrated hugepage is stored as a swap entry in the page
tables. On architectures that support hugepages consisting of
contiguous page table entries (such as on arm64) this leads to ambiguity
in determining the page table entry to return in huge_pte_offset() when
a poisoned entry is encountered.
Let's remove the ambiguity by adding a size parameter to convey
additional information about the requested address. Also fixup the
definition/usage of huge_pte_offset() throughout the tree.
Link: http://lkml.kernel.org/r/20170522133604.11392-4-punit.agrawal@arm.com
Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
Acked-by: Steve Capper <steve.capper@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: James Hogan <james.hogan@imgtec.com> (odd fixer:METAG ARCHITECTURE)
Cc: Ralf Baechle <ralf@linux-mips.org> (supporter:MIPS)
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
Cc: Helge Deller <deller@gmx.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Rich Felker <dalias@libc.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Chris Metcalf <cmetcalf@mellanox.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Hillf Danton <hillf.zj@alibaba-inc.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/userfaultfd.c')
| -rw-r--r-- | fs/userfaultfd.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c index 3d0dd082337a..cadcd12a3d35 100644 --- a/fs/userfaultfd.c +++ b/fs/userfaultfd.c @@ -214,6 +214,7 @@ static inline struct uffd_msg userfault_msg(unsigned long address, * hugepmd ranges. */ static inline bool userfaultfd_huge_must_wait(struct userfaultfd_ctx *ctx, + struct vm_area_struct *vma, unsigned long address, unsigned long flags, unsigned long reason) @@ -224,7 +225,7 @@ static inline bool userfaultfd_huge_must_wait(struct userfaultfd_ctx *ctx, VM_BUG_ON(!rwsem_is_locked(&mm->mmap_sem)); - pte = huge_pte_offset(mm, address); + pte = huge_pte_offset(mm, address, vma_mmu_pagesize(vma)); if (!pte) goto out; @@ -243,6 +244,7 @@ out: } #else static inline bool userfaultfd_huge_must_wait(struct userfaultfd_ctx *ctx, + struct vm_area_struct *vma, unsigned long address, unsigned long flags, unsigned long reason) @@ -448,7 +450,8 @@ int handle_userfault(struct vm_fault *vmf, unsigned long reason) must_wait = userfaultfd_must_wait(ctx, vmf->address, vmf->flags, reason); else - must_wait = userfaultfd_huge_must_wait(ctx, vmf->address, + must_wait = userfaultfd_huge_must_wait(ctx, vmf->vma, + vmf->address, vmf->flags, reason); up_read(&mm->mmap_sem); |