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Instead of grabbing the BKL on seek, use the inode mutex in the style
of generic_file_llseek().
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>