linux-kernel - [PATCH 1/5] mm/vmalloc: query dynamic DEBUG

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Date:	Thu,  4 Feb 2016 14:56:22 +0900
From:	Joonsoo Kim <js1304@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	David Rientjes <rientjes@...gle.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Takashi Iwai <tiwai@...e.com>,
	Chris Metcalf <cmetcalf@...hip.com>,
	Christoph Lameter <cl@...ux.com>, linux-api@...r.kernel.org,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: [PATCH 1/5] mm/vmalloc: query dynamic DEBUG_PAGEALLOC setting

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.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
---
 mm/vmalloc.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index fb42a5b..e0e51bd 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -543,10 +543,10 @@ static void vmap_debug_free_range(unsigned long start, unsigned long end)
 	 * debugging doesn't do a broadcast TLB flush so it is a lot
 	 * faster).
 	 */
-#ifdef CONFIG_DEBUG_PAGEALLOC
-	vunmap_page_range(start, end);
-	flush_tlb_kernel_range(start, end);
-#endif
+	if (debug_pagealloc_enabled()) {
+		vunmap_page_range(start, end);
+		flush_tlb_kernel_range(start, end);
+	}
 }
 
 /*
-- 
1.9.1