• Seth, Rohit's avatar
    [PATCH] Handle spurious page fault for hugetlb region · 3359b54c
    Seth, Rohit authored
    
    
    The hugetlb pages are currently pre-faulted.  At the time of mmap of
    hugepages, we populate the new PTEs.  It is possible that HW has already
    cached some of the unused PTEs internally.  These stale entries never
    get a chance to be purged in existing control flow.
    
    This patch extends the check in page fault code for hugepages.  Check if
    a faulted address falls with in size for the hugetlb file backing it.
    We return VM_FAULT_MINOR for these cases (assuming that the arch
    specific page-faulting code purges the stale entry for the archs that
    need it).
    Signed-off-by: default avatarRohit Seth <rohit.seth@intel.com>
    
    [ This is apparently arguably an ia64 port bug. But the code won't
      hurt, and for now it fixes a real problem on some ia64 machines ]
    Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
    3359b54c
hugetlb.h 5.37 KB