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Wanpeng Li 3965c9ae47 mm: prepare for removal of obsolete /proc/sys/vm/nr_pdflush_threads

Since per-BDI flusher threads were introduced in 2.6, the pdflush
mechanism is not used any more.  But the old interface exported through
/proc/sys/vm/nr_pdflush_threads still exists and is obviously useless.

For back-compatibility, printk warning information and return 2 to notify
the users that the interface is removed.

Signed-off-by: Wanpeng Li <liwp@linux.vnet.ibm.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2012-07-31 18:42:40 -07:00

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 What:		/proc/sys/vm/nr_pdflush_threads
 Date:		June 2012
 Contact:	Wanpeng Li <liwp@linux.vnet.ibm.com>
 Description: Since pdflush is replaced by per-BDI flusher, the interface of old pdflush
              exported in /proc/sys/vm/ should be removed.