• Y
    mm: fix incorrect pfn passed to untrack_pfn() in remap_pfn_range() · d5957d2f
    Yongji Xie 提交于
    We use generic hooks in remap_pfn_range() to help archs to track pfnmap
    regions.  The code is something like:
    
      int remap_pfn_range()
      {
    	...
    	track_pfn_remap(vma, &prot, pfn, addr, PAGE_ALIGN(size));
    	...
    	pfn -= addr >> PAGE_SHIFT;
    	...
    	untrack_pfn(vma, pfn, PAGE_ALIGN(size));
    	...
      }
    
    Here we can easily find the pfn is changed but not recovered before
    untrack_pfn() is called.  That's incorrect.
    
    There are no known runtime effects - this is from inspection.
    Signed-off-by: NYongji Xie <xyjxie@linux.vnet.ibm.com>
    Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
    Cc: Jerome Marchand <jmarchan@redhat.com>
    Cc: Ingo Molnar <mingo@kernel.org>
    Cc: Vlastimil Babka <vbabka@suse.cz>
    Cc: Dave Hansen <dave.hansen@linux.intel.com>
    Cc: Dan Williams <dan.j.williams@intel.com>
    Cc: Matthew Wilcox <matthew.r.wilcox@intel.com>
    Cc: Andrea Arcangeli <aarcange@redhat.com>
    Cc: Michal Hocko <mhocko@suse.com>
    Cc: Andy Lutomirski <luto@kernel.org>
    Cc: David Hildenbrand <dahi@linux.vnet.ibm.com>
    Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
    d5957d2f
memory.c 107.5 KB