[PATCH v2 3/5] sound: query dynamic DEBUG_PAGEALLOC setting
From: <hidden>
Date: 2016-02-11 04:06:08
Also in:
linux-api, lkml
Subsystem:
memory management, memory management - page allocator, sound, the rest · Maintainers:
Andrew Morton, Vlastimil Babka, Jaroslav Kysela, Takashi Iwai, Linus Torvalds
From: Joonsoo Kim <redacted> 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. v2: export _debug_pagealloc_enabled to modules, per Andrew. Acked-by: David Rientjes <rientjes@google.com> Acked-by: Takashi Iwai <redacted> Signed-off-by: Joonsoo Kim <redacted> --- mm/page_alloc.c | 1 + sound/drivers/pcsp/pcsp.c | 9 +++++---- 2 files changed, 6 insertions(+), 4 deletions(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 87b3e2f..00118fe 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c@@ -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)
diff --git a/sound/drivers/pcsp/pcsp.c b/sound/drivers/pcsp/pcsp.c
index 27e25bb..72e2d00 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; }
--
1.9.1
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