linux-kernel - [PATCH] xen: remove incorrect forward declaration

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Date:	Wed, 11 May 2016 15:07:42 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	David Vrabel <david.vrabel@...rix.com>
Cc:	Ross Lagerwall <ross.lagerwall@...rix.com>,
	Arnd Bergmann <arnd@...db.de>, stable@...r.kernel.org,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Juergen Gross <jgross@...e.com>,
	Daniel Kiper <daniel.kiper@...cle.com>,
	Julien Grall <julien.grall@...rix.com>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Vitaly Kuznetsov <vkuznets@...hat.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Subject: [PATCH] xen: remove incorrect forward declaration

A bugfix patch for the xen balloon driver introduced a forward
declaration for a static function that is conditionally compiled,
causing a warning if only the declaration but not the definition
are there:

drivers/xen/balloon.c:154:13: error: 'release_memory_resource' declared 'static' but never defined [-Werror=unused-function]
 static void release_memory_resource(struct resource *resource);

This removes the declaration again and instead moves the function
definition to the right place, before its first caller and inside
of the #ifdef protecting both.

The patch that introduced the warning is marked for stable
backports, so if that gets applied to 4.4, so should this one.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
Fixes: dfd74a1edfab ("xen/balloon: Fix crash when ballooning on x86 32 bit PAE")
Cc: stable@...r.kernel.org
---
 drivers/xen/balloon.c | 28 +++++++++++++---------------
 1 file changed, 13 insertions(+), 15 deletions(-)

diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index d46839f51e73..e4db19e88ab1 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -151,8 +151,6 @@ static DECLARE_WAIT_QUEUE_HEAD(balloon_wq);
 static void balloon_process(struct work_struct *work);
 static DECLARE_DELAYED_WORK(balloon_worker, balloon_process);
 
-static void release_memory_resource(struct resource *resource);
-
 /* When ballooning out (allocating memory to return to Xen) we don't really
    want the kernel to try too hard since that can trigger the oom killer. */
 #define GFP_BALLOON \
@@ -248,6 +246,19 @@ static enum bp_state update_schedule(enum bp_state state)
 }
 
 #ifdef CONFIG_XEN_BALLOON_MEMORY_HOTPLUG
+static void release_memory_resource(struct resource *resource)
+{
+	if (!resource)
+		return;
+
+	/*
+	 * No need to reset region to identity mapped since we now
+	 * know that no I/O can be in this region
+	 */
+	release_resource(resource);
+	kfree(resource);
+}
+
 static struct resource *additional_memory_resource(phys_addr_t size)
 {
 	struct resource *res;
@@ -286,19 +297,6 @@ static struct resource *additional_memory_resource(phys_addr_t size)
 	return res;
 }
 
-static void release_memory_resource(struct resource *resource)
-{
-	if (!resource)
-		return;
-
-	/*
-	 * No need to reset region to identity mapped since we now
-	 * know that no I/O can be in this region
-	 */
-	release_resource(resource);
-	kfree(resource);
-}
-
 static enum bp_state reserve_additional_memory(void)
 {
 	long credit;
-- 
2.7.0