On 04/25/2014 05:01 AM, Hugh Dickins wrote: > Er, i_mmap_mutex. > > That's what unmap_mapping_range(), and page_mkclean()'s rmap_walk, > take to iterate over the file vmas. So perhaps there's no race at all > in the unmap_mapping_range() case. And easy (I imagine) to fix the > race in Dave's racewrite.c use of MADV_DONTNEED: untested patch below. > > But exit and munmap() don't take i_mmap_mutex: perhaps they should > when encountering a VM_SHARED vma (I believe VM_SHARED should be > peculiar to having vm_file set, but test both below because I don't > want to oops in some odd corner where a special vma is set up). Hey Hugh, Do you want some testing on this? -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>