linux-kernel - [PATCH 12/14] mm/mmap_lock: Remove dead code for !CONFIG

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Message-Id: <20210520084809.8576-13-mgorman@techsingularity.net>
Date:   Thu, 20 May 2021 09:48:07 +0100
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Michal Hocko <mhocko@...nel.org>,
        David Hildenbrand <david@...hat.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Dan Streetman <ddstreet@...e.org>,
        Yang Shi <shy828301@...il.com>, Linux-MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Mel Gorman <mgorman@...hsingularity.net>
Subject: [PATCH 12/14] mm/mmap_lock: Remove dead code for !CONFIG_TRACING configurations

make W=1 generates the following warning in mmap_lock.c for allnoconfig

  mm/mmap_lock.c:213:6: warning: no previous prototype for ‘__mmap_lock_do_trace_start_locking’ [-Wmissing-prototypes]
   void __mmap_lock_do_trace_start_locking(struct mm_struct *mm, bool write)
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  mm/mmap_lock.c:219:6: warning: no previous prototype for ‘__mmap_lock_do_trace_acquire_returned’ [-Wmissing-prototypes]
   void __mmap_lock_do_trace_acquire_returned(struct mm_struct *mm, bool write,
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  mm/mmap_lock.c:226:6: warning: no previous prototype for ‘__mmap_lock_do_trace_released’ [-Wmissing-prototypes]
   void __mmap_lock_do_trace_released(struct mm_struct *mm, bool write)

On !CONFIG_TRACING configurations, the code is dead so put it behind
an #ifdef.

Signed-off-by: Mel Gorman <mgorman@...hsingularity.net>
---
 mm/mmap_lock.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/mmap_lock.c b/mm/mmap_lock.c
index dcdde4f722a4..03ee85c696ef 100644
--- a/mm/mmap_lock.c
+++ b/mm/mmap_lock.c
@@ -205,6 +205,7 @@ void trace_mmap_lock_unreg(void)
 
 #endif /* CONFIG_MEMCG */
 
+#ifdef CONFIG_TRACING
 /*
  * Trace calls must be in a separate file, as otherwise there's a circular
  * dependency between linux/mmap_lock.h and trace/events/mmap_lock.h.
@@ -228,3 +229,4 @@ void __mmap_lock_do_trace_released(struct mm_struct *mm, bool write)
 	TRACE_MMAP_LOCK_EVENT(released, mm, write);
 }
 EXPORT_SYMBOL(__mmap_lock_do_trace_released);
+#endif /* CONFIG_TRACING */
-- 
2.26.2