+ hugetlbfs-fix-hugetlbfs_statfs-locking.patch added to mm-unstable branch

+ hugetlbfs-fix-hugetlbfs_statfs-locking.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: hugetlbfs: fix hugetlbfs_statfs() locking
has been added to the -mm mm-unstable branch.  Its filename is
     hugetlbfs-fix-hugetlbfs_statfs-locking.patch

This patch should soon 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: Mina Almasry <almasrymina@google.com>
Subject: hugetlbfs: fix hugetlbfs_statfs() locking

After commit db71ef79b59b ("hugetlb: make free_huge_page irq safe"), the
subpool lock should be locked with spin_lock_irq() and all call sites was
modified as such, except for the ones in hugetlbfs_statfs().

Link: https://lkml.kernel.org/r/20220429202207.3045-1-almasrymina@google.com
Fixes: db71ef79b59b ("hugetlb: make free_huge_page irq safe")
Signed-off-by: Mina Almasry <almasrymina@google.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/hugetlbfs/inode.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/fs/hugetlbfs/inode.c~hugetlbfs-fix-hugetlbfs_statfs-locking
+++ a/fs/hugetlbfs/inode.c
@@ -1051,12 +1051,12 @@ static int hugetlbfs_statfs(struct dentr
 		if (sbinfo->spool) {
 			long free_pages;
 
-			spin_lock(&sbinfo->spool->lock);
+			spin_lock_irq(&sbinfo->spool->lock);
 			buf->f_blocks = sbinfo->spool->max_hpages;
 			free_pages = sbinfo->spool->max_hpages
 				- sbinfo->spool->used_hpages;
 			buf->f_bavail = buf->f_bfree = free_pages;
-			spin_unlock(&sbinfo->spool->lock);
+			spin_unlock_irq(&sbinfo->spool->lock);
 			buf->f_files = sbinfo->max_inodes;
 			buf->f_ffree = sbinfo->free_inodes;
 		}
_

Patches currently in -mm which might be from almasrymina@google.com are

hugetlbfs-fix-hugetlbfs_statfs-locking.patch