proc: less memory for /proc/*/map_files readdir
dentry name can be evaluated later, right before calling into VFS. Also, spend less time under ->mmap_sem. Link: http://lkml.kernel.org/r/20171110163034.GA2534@avx2Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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