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mm: prepare for removal of obsolete /proc/sys/vm/nr_pdflush_threads

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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>
This commit is contained in:
Wanpeng Li 2012-07-31 16:41:52 -07:00 • committed by Linus Torvalds
parent deaf386ee5
commit 3965c9ae47
9 changed files with 40 additions and 27 deletions
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5
include/linux/writeback.h
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@ -189,9 +189,4 @@ void tag_pages_for_writeback(struct address_space *mapping,
void account_page_redirty(struct page *page);
/* pdflush.c */
extern int nr_pdflush_threads; /* Global so it can be exported to sysctl
read-only. */
#endif /* WRITEBACK_H */