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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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8
kernel/sysctl.c
View file

@ -1101,11 +1101,9 @@ static struct ctl_table vm_table[] = {
.extra1 = &zero,
},
{
.procname = "nr_pdflush_threads",
.data = &nr_pdflush_threads,
.maxlen = sizeof nr_pdflush_threads,
.mode = 0444 /* read-only*/,
.proc_handler = proc_dointvec,
.procname = "nr_pdflush_threads",
.mode = 0444 /* read-only */,
.proc_handler = pdflush_proc_obsolete,
},
{
.procname = "swappiness",