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.

Link: https://lkml.kernel.org/r/20221216224507.106789-1-mike.kravetz@oracle.com
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 0e5441d..a82f410 100644 (file)
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -6760,7 +6760,7 @@ 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;