The mmp_time field is 64 bits wide, which is good, but calling
get_seconds() results in a 32-bit value on 32-bit architectures. Using
ktime_get_real_seconds() instead returns 64 bits everywhere.

Reviewed-by: Andreas Dilger <adil...@dilger.ca>
Reviewed-by: Jan Kara <j...@suse.cz>
Signed-off-by: Arnd Bergmann <a...@arndb.de>
---
 fs/ext4/mmp.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/ext4/mmp.c b/fs/ext4/mmp.c
index 27b9a76a0dfa..39da4eb48361 100644
--- a/fs/ext4/mmp.c
+++ b/fs/ext4/mmp.c
@@ -147,7 +147,7 @@ static int kmmpd(void *data)
 
        mmp_block = le64_to_cpu(es->s_mmp_block);
        mmp = (struct mmp_struct *)(bh->b_data);
-       mmp->mmp_time = cpu_to_le64(get_seconds());
+       mmp->mmp_time = cpu_to_le64(ktime_get_real_seconds());
        /*
         * Start with the higher mmp_check_interval and reduce it if
         * the MMP block is being updated on time.
@@ -165,7 +165,7 @@ static int kmmpd(void *data)
                        seq = 1;
 
                mmp->mmp_seq = cpu_to_le32(seq);
-               mmp->mmp_time = cpu_to_le64(get_seconds());
+               mmp->mmp_time = cpu_to_le64(ktime_get_real_seconds());
                last_update_time = jiffies;
 
                retval = write_mmp_block(sb, bh);
@@ -244,7 +244,7 @@ static int kmmpd(void *data)
         * Unmount seems to be clean.
         */
        mmp->mmp_seq = cpu_to_le32(EXT4_MMP_SEQ_CLEAN);
-       mmp->mmp_time = cpu_to_le64(get_seconds());
+       mmp->mmp_time = cpu_to_le64(ktime_get_real_seconds());
 
        retval = write_mmp_block(sb, bh);
 
-- 
2.9.0

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