• Benjamin Herrenschmidt's avatar
    [POWERPC] spufs: Fix bitrot of the SPU mmap facility · 17e0e270
    Benjamin Herrenschmidt authored
    It looks like we've had some serious bitrot there mostly due to tracking
    of address_space's of mmap'ed files getting out of sync with the actual
    mmap code. The mfc, mss and psmap were not tracked properly and thus
    not invalidated on context switches (oops !)
    
    I also removed the various file->f_mapping = inode->i_mapping;
    assignments that were done in the other open() routines since that
    is already done for us by __dentry_open.
    
    One improvement we might want to do later is to assign the various
    ctx-> fields at mmap time instead of file open/close time so that we
    don't call unmap_mapping_range() on thing that have not been mmap'ed
    
    Finally, I added some smp_wmb's after assigning the ctx-> fields to make
    sure they are visible to other CPUs. I don't think this is really
    necessary as I suspect locking in the fs layer will make that happen
    anyway but better safe than sorry.
    Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
    Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
    17e0e270
file.c 43.6 KB