• Linus Torvalds's avatar
    Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/borntraeger/linux · 60815cf2
    Linus Torvalds authored
    Pull ACCESS_ONCE cleanup preparation from Christian Borntraeger:
     "kernel: Provide READ_ONCE and ASSIGN_ONCE
    
      As discussed on LKML http://marc.info/?i=54611D86.4040306%40de.ibm.com
      ACCESS_ONCE might fail with specific compilers for non-scalar
      accesses.
    
      Here is a set of patches to tackle that problem.
    
      The first patch introduce READ_ONCE and ASSIGN_ONCE.  If the data
      structure is larger than the machine word size memcpy is used and a
      warning is emitted.  The next patches fix up several in-tree users of
      ACCESS_ONCE on non-scalar types.
    
      This does not yet contain a patch that forces ACCESS_ONCE to work only
      on scalar types.  This is targetted for the next merge window as Linux
      next already contains new offenders regarding ACCESS_ONCE vs.
      non-scalar types"
    
    * tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/borntraeger/linux:
      s390/kvm: REPLACE barrier fixup with READ_ONCE
      arm/spinlock: Replace ACCESS_ONCE with READ_ONCE
      arm64/spinlock: Replace ACCESS_ONCE READ_ONCE
      mips/gup: Replace ACCESS_ONCE with READ_ONCE
      x86/gup: Replace ACCESS_ONCE with READ_ONCE
      x86/spinlock: Replace ACCESS_ONCE with READ_ONCE
      mm: replace ACCESS_ONCE with READ_ONCE or barriers
      kernel: Provide READ_ONCE and ASSIGN_ONCE
    60815cf2
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