mm/vmalloc: query dynamic DEBUG_PAGEALLOC setting

As CONFIG_DEBUG_PAGEALLOC can be enabled/disabled via kernel parameters
we can optimize some cases by checking the enablement state.

This is follow-up work for Christian's Optimize CONFIG_DEBUG_PAGEALLOC:

  https://lkml.org/lkml/2016/1/27/194

Remaining work is to make sparc to be aware of this but it looks not
easy for me so I skip that in this series.

This patch (of 5):

We can disable debug_pagealloc processing even if the code is complied
with CONFIG_DEBUG_PAGEALLOC.  This patch changes the code to query
whether it is enabled or not in runtime.

[[email protected]: update comment, per David.  Adjust comment to use 80 cols]
Signed-off-by: Joonsoo Kim <[email protected]>
Reviewed-by: Christian Borntraeger <[email protected]>
Acked-by: David Rientjes <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Takashi Iwai <[email protected]>
Cc: Chris Metcalf <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: Pekka Enberg <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

0 files changed, 0 insertions, 0 deletions