linux-kernel - [PATCH] mm/cma: Drop CONFIG_CMA

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Date: Mon,  5 Feb 2024 08:46:47 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: linux-mm@...ck.org
Cc: Anshuman Khandual <anshuman.khandual@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] mm/cma: Drop CONFIG_CMA_DEBUG

All pr_debug() prints in (mm/cma.c) could be enabled via standard Makefile
based method. Besides cma_debug_show_areas() should always be called during
cma_alloc() failure path. This seemingly redundant config, CONFIG_CMA_DEBUG
can be dropped without any problem.

Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
This applies on v6.8-rc3.

 mm/Kconfig | 9 ---------
 mm/cma.c   | 9 ---------
 2 files changed, 18 deletions(-)

diff --git a/mm/Kconfig b/mm/Kconfig
index ffc3a2ba3a8c..35fa9940e61f 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -901,15 +901,6 @@ config CMA
 
 	  If unsure, say "n".
 
-config CMA_DEBUG
-	bool "CMA debug messages (DEVELOPMENT)"
-	depends on DEBUG_KERNEL && CMA
-	help
-	  Turns on debug messages in CMA.  This produces KERN_DEBUG
-	  messages for every CMA call as well as various messages while
-	  processing calls such as dma_alloc_from_contiguous().
-	  This option does not affect warning and error messages.
-
 config CMA_DEBUGFS
 	bool "CMA debugfs interface"
 	depends on CMA && DEBUG_FS
diff --git a/mm/cma.c b/mm/cma.c
index 7c09c47e530b..ed6581ef50c1 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -14,11 +14,6 @@
 
 #define pr_fmt(fmt) "cma: " fmt
 
-#ifdef CONFIG_CMA_DEBUG
-#ifndef DEBUG
-#  define DEBUG
-#endif
-#endif
 #define CREATE_TRACE_POINTS
 
 #include <linux/memblock.h>
@@ -387,7 +382,6 @@ int __init cma_declare_contiguous_nid(phys_addr_t base,
 	return ret;
 }
 
-#ifdef CONFIG_CMA_DEBUG
 static void cma_debug_show_areas(struct cma *cma)
 {
 	unsigned long next_zero_bit, next_set_bit, nr_zero;
@@ -412,9 +406,6 @@ static void cma_debug_show_areas(struct cma *cma)
 	pr_cont("=> %lu free of %lu total pages\n", nr_total, cma->count);
 	spin_unlock_irq(&cma->lock);
 }
-#else
-static inline void cma_debug_show_areas(struct cma *cma) { }
-#endif
 
 /**
  * cma_alloc() - allocate pages from contiguous area
-- 
2.25.1