[request for stable inclusion] include/linux/fs.h: disable preempt when acquire i_size_seqcount write lock

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Hi, Fan or Andrew,

74e3d1e17b2e11d175970b85acd44f5927000ba2
include/linux/fs.h: disable preempt when acquire i_size_seqcount write lock


This looks applicable to stable-3.4, that fix a lockup while two rt tasks 
bind to one CPU core. It was built successful for me. What do you think?

Thanks!
Zhao Hongjiang

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