linux-kernel - [PATCH 3.2 121/147] vmw_balloon: fix for a -Wuninitialized warning

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Date:   Mon, 06 Nov 2017 23:03:07 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Danny Kukawka" <danny.kukawka@...ect.de>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>
Subject: [PATCH 3.2 121/147] vmw_balloon: fix for a -Wuninitialized warning

3.2.95-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Danny Kukawka <danny.kukawka@...ect.de>

commit 3e5ba466d515eb3fb1e0e975a3d8e499126ae2b5 upstream.

Fix for a -Wuninitialized compiler warning. Changed return value of
vmballoon_send_lock_page() from bool to int to be able to distinguish
between the error cases to avoid uninitialized use of hv_status in
vmballoon_reserve_page()

Signed-off-by: Danny Kukawka <danny.kukawka@...ect.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/misc/vmw_balloon.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

--- a/drivers/misc/vmw_balloon.c
+++ b/drivers/misc/vmw_balloon.c
@@ -314,7 +314,7 @@ static bool vmballoon_send_get_target(st
  * fear that guest will need it. Host may reject some pages, we need to
  * check the return value and maybe submit a different page.
  */
-static bool vmballoon_send_lock_page(struct vmballoon *b, unsigned long pfn,
+static int vmballoon_send_lock_page(struct vmballoon *b, unsigned long pfn,
 				     unsigned int *hv_status)
 {
 	unsigned long status, dummy;
@@ -322,17 +322,17 @@ static bool vmballoon_send_lock_page(str
 
 	pfn32 = (u32)pfn;
 	if (pfn32 != pfn)
-		return false;
+		return -1;
 
 	STATS_INC(b->stats.lock);
 
 	*hv_status = status = VMWARE_BALLOON_CMD(LOCK, pfn, dummy);
 	if (vmballoon_check_status(b, status))
-		return true;
+		return 0;
 
 	pr_debug("%s - ppn %lx, hv returns %ld\n", __func__, pfn, status);
 	STATS_INC(b->stats.lock_fail);
-	return false;
+	return 1;
 }
 
 /*
@@ -411,7 +411,7 @@ static int vmballoon_reserve_page(struct
 	struct page *page;
 	gfp_t flags;
 	unsigned int hv_status;
-	bool locked = false;
+	int locked;
 	flags = can_sleep ? VMW_PAGE_ALLOC_CANSLEEP : VMW_PAGE_ALLOC_NOSLEEP;
 
 	do {
@@ -431,7 +431,7 @@ static int vmballoon_reserve_page(struct
 
 		/* inform monitor */
 		locked = vmballoon_send_lock_page(b, page_to_pfn(page), &hv_status);
-		if (!locked) {
+		if (locked > 0) {
 			STATS_INC(b->stats.refused_alloc);
 
 			if (hv_status == VMW_BALLOON_ERROR_RESET ||
@@ -449,7 +449,7 @@ static int vmballoon_reserve_page(struct
 			if (++b->n_refused_pages >= VMW_BALLOON_MAX_REFUSED)
 				return -EIO;
 		}
-	} while (!locked);
+	} while (locked != 0);
 
 	/* track allocated page */
 	list_add(&page->lru, &b->pages);