+ hugetlb-initialize-variable-to-avoid-compiler-warning.patch added to mm-unstable branch

+ hugetlb-initialize-variable-to-avoid-compiler-warning.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: hugetlb: initialize variable to avoid compiler warning
has been added to the -mm mm-unstable branch.  Its filename is
     hugetlb-initialize-variable-to-avoid-compiler-warning.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/hugetlb-initialize-variable-to-avoid-compiler-warning.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do a
      reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days

------------------------------------------------------
From: Mike Kravetz <mike.kravetz@oracle.com>
Subject: hugetlb: initialize variable to avoid compiler warning
Date: Fri, 16 Dec 2022 14:45:07 -0800

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>
---

 mm/hugetlb.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/hugetlb.c~hugetlb-initialize-variable-to-avoid-compiler-warning
+++ a/mm/hugetlb.c
@@ -6736,7 +6736,7 @@ bool hugetlb_reserve_pages(struct 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;
_

Patches currently in -mm which might be from mike.kravetz@oracle.com are

hugetlb-really-allocate-vma-lock-for-all-sharable-vmas.patch
hugetlb-update-vma-flag-check-for-hugetlb-vma-lock.patch
hugetlb-initialize-variable-to-avoid-compiler-warning.patch