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Commit 505f6d22 authored by Joonsoo Kim's avatar Joonsoo Kim Committed by Linus Torvalds
Browse files

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: default avatarJoonsoo Kim <iamjoonsoo.kim@lge.com>
Acked-by: default avatarDavid Rientjes <rientjes@google.com>
Acked-by: default avatarTakashi 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 922d566c

mm/page_alloc.c

+1 −0
Original line number Diff line number Diff line
@@ -498,6 +498,7 @@ void prep_compound_page(struct page *page, unsigned int order) 
unsigned int _debug_guardpage_minorder;

bool _debug_pagealloc_enabled __read_mostly

			= IS_ENABLED(CONFIG_DEBUG_PAGEALLOC_ENABLE_DEFAULT);

EXPORT_SYMBOL(_debug_pagealloc_enabled);

bool _debug_guardpage_enabled __read_mostly;



static int __init early_debug_pagealloc(char *buf)

sound/drivers/pcsp/pcsp.c

+5 −4
Original line number Diff line number Diff line
@@ -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 */

	if (debug_pagealloc_enabled()) {

		printk(KERN_WARNING "PCSP: CONFIG_DEBUG_PAGEALLOC is enabled, "

		       "which may make the sound noisy.\n");

#endif

	}



	return 0;

}