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| author | Peter Xu <peterx@redhat.com> | 2024-08-26 16:43:39 -0400 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-09-17 01:06:58 -0700 |
| commit | ae3c99e650da4a8f4deb3670c29059de375a88be (patch) | |
| tree | 043bad330b109fb3e4245eae331361b73b014783 | |
| parent | 5dd40721f147e83733ad34848330913cb633046e (diff) | |
| download | linux-ae3c99e650da4a8f4deb3670c29059de375a88be.tar.gz linux-ae3c99e650da4a8f4deb3670c29059de375a88be.tar.bz2 linux-ae3c99e650da4a8f4deb3670c29059de375a88be.zip | |
mm/gup: detect huge pfnmap entries in gup-fast
Since gup-fast doesn't have the vma reference, teach it to detect such huge
pfnmaps by checking the special bit for pmd/pud too, just like ptes.
Link: https://lkml.kernel.org/r/20240826204353.2228736-6-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Alex Williamson <alex.williamson@redhat.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Gavin Shan <gshan@redhat.com>
Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Niklas Schnelle <schnelle@linux.ibm.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
| -rw-r--r-- | mm/gup.c | 6 |
1 files changed, 6 insertions, 0 deletions
@@ -3038,6 +3038,9 @@ static int gup_fast_pmd_leaf(pmd_t orig, pmd_t *pmdp, unsigned long addr, if (!pmd_access_permitted(orig, flags & FOLL_WRITE)) return 0; + if (pmd_special(orig)) + return 0; + if (pmd_devmap(orig)) { if (unlikely(flags & FOLL_LONGTERM)) return 0; @@ -3082,6 +3085,9 @@ static int gup_fast_pud_leaf(pud_t orig, pud_t *pudp, unsigned long addr, if (!pud_access_permitted(orig, flags & FOLL_WRITE)) return 0; + if (pud_special(orig)) + return 0; + if (pud_devmap(orig)) { if (unlikely(flags & FOLL_LONGTERM)) return 0; |