sound: query dynamic DEBUG_PAGEALLOC setting

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

[akpm@linux-foundation.org: export _debug_pagealloc_enabled to modules]
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Chris Metcalf <cmetcalf@ezchip.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 5 insertions, 4 deletions

diff --git a/sound/drivers/pcsp/pcsp.c b/sound/drivers/pcsp/pcsp.c
index 27e25bb78c97..72e2d0012084 100644
--- a/sound/drivers/pcsp/pcsp.c
+++ b/sound/drivers/pcsp/pcsp.c
@@ -14,6 +14,7 @@
 #include <linux/input.h>
 #include <linux/delay.h>
 #include <linux/bitops.h>
+#include <linux/mm.h>
 #include "pcsp_input.h"
 #include "pcsp.h"
 
@@ -148,11 +149,11 @@ static int alsa_card_pcsp_init(struct device *dev)
                 return err;
         }
 
-#ifdef CONFIG_DEBUG_PAGEALLOC
         /* Well, CONFIG_DEBUG_PAGEALLOC makes the sound horrible. Lets alert */
-        printk(KERN_WARNING "PCSP: CONFIG_DEBUG_PAGEALLOC is enabled, "
-               "which may make the sound noisy.\n");
-#endif
+        if (debug_pagealloc_enabled()) {
+                printk(KERN_WARNING "PCSP: CONFIG_DEBUG_PAGEALLOC is enabled, "
+                       "which may make the sound noisy.\n");
+        }
 
         return 0;
 }