linux-kernel - [RFC PATCH 26/61] fscache, cachefiles: Fix disabled histogram warnings

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Date:   Mon, 04 May 2020 18:11:25 +0100
From:   David Howells <dhowells@...hat.com>
To:     Trond Myklebust <trondmy@...merspace.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        Steve French <sfrench@...ba.org>,
        Jeff Layton <jlayton@...hat.com>
Cc:     dhowells@...hat.com, Matthew Wilcox <willy@...radead.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-afs@...ts.infradead.org, linux-nfs@...r.kernel.org,
        linux-cifs@...r.kernel.org, ceph-devel@...r.kernel.org,
        v9fs-developer@...ts.sourceforge.net,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH 26/61] fscache,
 cachefiles: Fix disabled histogram warnings

Fix variable unused warnings due to disabled histogram stuff.

Signed-off-by: David Howells <dhowells@...hat.com>
---

 fs/cachefiles/internal.h |    7 +++++--
 fs/fscache/internal.h    |    6 ++++--
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/fs/cachefiles/internal.h b/fs/cachefiles/internal.h
index b89f76a03546..16d15291a629 100644
--- a/fs/cachefiles/internal.h
+++ b/fs/cachefiles/internal.h
@@ -143,11 +143,11 @@ extern int cachefiles_check_in_use(struct cachefiles_cache *cache,
 /*
  * proc.c
  */
-#ifdef CONFIG_CACHEFILES_HISTOGRAM
 extern atomic_t cachefiles_lookup_histogram[HZ];
 extern atomic_t cachefiles_mkdir_histogram[HZ];
 extern atomic_t cachefiles_create_histogram[HZ];
 
+#ifdef CONFIG_CACHEFILES_HISTOGRAM
 extern int __init cachefiles_proc_init(void);
 extern void cachefiles_proc_cleanup(void);
 static inline
@@ -162,7 +162,10 @@ void cachefiles_hist(atomic_t histogram[], unsigned long start_jif)
 #else
 #define cachefiles_proc_init()		(0)
 #define cachefiles_proc_cleanup()	do {} while (0)
-#define cachefiles_hist(hist, start_jif) do {} while (0)
+static inline
+void cachefiles_hist(atomic_t histogram[], unsigned long start_jif)
+{
+}
 #endif
 
 /*
diff --git a/fs/fscache/internal.h b/fs/fscache/internal.h
index 443671310e31..a70c1a612309 100644
--- a/fs/fscache/internal.h
+++ b/fs/fscache/internal.h
@@ -95,13 +95,13 @@ extern struct fscache_cookie fscache_fsdef_index;
 /*
  * histogram.c
  */
-#ifdef CONFIG_FSCACHE_HISTOGRAM
 extern atomic_t fscache_obj_instantiate_histogram[HZ];
 extern atomic_t fscache_objs_histogram[HZ];
 extern atomic_t fscache_ops_histogram[HZ];
 extern atomic_t fscache_retrieval_delay_histogram[HZ];
 extern atomic_t fscache_retrieval_histogram[HZ];
 
+#ifdef CONFIG_FSCACHE_HISTOGRAM
 static inline void fscache_hist(atomic_t histogram[], unsigned long start_jif)
 {
 	unsigned long jif = jiffies - start_jif;
@@ -113,7 +113,9 @@ static inline void fscache_hist(atomic_t histogram[], unsigned long start_jif)
 extern const struct seq_operations fscache_histogram_ops;
 
 #else
-#define fscache_hist(hist, start_jif) do {} while (0)
+static inline void fscache_hist(atomic_t histogram[], unsigned long start_jif)
+{
+}
 #endif
 
 /*