linux-kernel - [PATCH] hugetlb: initialize variable to avoid compiler warning

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Date:   Fri, 16 Dec 2022 14:45:07 -0800
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Mike Kravetz <mike.kravetz@...cle.com>
Subject: [PATCH] hugetlb: initialize variable to avoid compiler warning

With the gcc 'maybe-uninitialized' warning enabled, gcc will produce:
  mm/hugetlb.c:6896:20: warning: ‘chg’ may be used uninitialized
This is a false positive, but may be difficult for the compiler to
determine.  maybe-uninitialized is disabled by default, but this gets
flagged as a 0-DAY build regression.

Initialize the variable to silence the warning.

Signed-off-by: Mike Kravetz <mike.kravetz@...cle.com>
---
 mm/hugetlb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 0dfe441f9f4d..b28b699c0a1a 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -6747,7 +6747,7 @@ bool hugetlb_reserve_pages(struct inode *inode,
 					struct vm_area_struct *vma,
 					vm_flags_t vm_flags)
 {
-	long chg, add = -1;
+	long chg = -1, add = -1;
 	struct hstate *h = hstate_inode(inode);
 	struct hugepage_subpool *spool = subpool_inode(inode);
 	struct resv_map *resv_map;
-- 
2.38.1