procfs: Kill BKL in llseek on proc base
We don't use the BKL elsewhere, so use generic_file_llseek so we can avoid default_llseek taking the BKL. Signed-off-by: NArnd Bergmann <arnd@arndb.de> [restore proc_fdinfo_file_operations as non-seekable] Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: John Kacur <jkacur@redhat.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Al Viro <viro@ZenIV.linux.org.uk>
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