From 505f6d22dbc63f333d1178dc80264e40b5c35268 Mon Sep 17 00:00:00 2001 From: Joonsoo Kim Date: Thu, 17 Mar 2016 14:17:56 -0700 Subject: [PATCH] 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 Acked-by: David Rientjes Acked-by: Takashi Iwai Cc: Benjamin Herrenschmidt Cc: Chris Metcalf Cc: Christian Borntraeger Cc: Christoph Lameter Cc: Pekka Enberg Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- 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 c7332a4bc8db..b1fc19ebb8a2 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 27e25bb78c97..72e2d0012084 100644 --- a/sound/drivers/pcsp/pcsp.c +++ b/sound/drivers/pcsp/pcsp.c @@ -14,6 +14,7 @@ #include #include #include +#include #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; } -- GitLab