coredump: Use 64bit time for unix time of coredump

struct timeval on 32-bit systems will have its tv_sec
value overflow in year 2038 and beyond.
Use a 64 bit value to print time of the coredump in seconds.
ktime_get_real_seconds is chosen here for efficiency reasons.

Suggested by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Tina Ruchandani <ruchandani.tina@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 5 insertions, 3 deletions

diff --git a/fs/coredump.c b/fs/coredump.c
index 1777331eee76..b3c153ca435d 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -32,6 +32,7 @@
 #include <linux/pipe_fs_i.h>
 #include <linux/oom.h>
 #include <linux/compat.h>
+#include <linux/timekeeping.h>
 
 #include <asm/uaccess.h>
 #include <asm/mmu_context.h>
@@ -232,9 +233,10 @@ static int format_corename(struct core_name *cn, struct coredump_params *cprm)
                                 break;
                         /* UNIX time of coredump */
                         case 't': {
-                                struct timeval tv;
-                                do_gettimeofday(&tv);
-                                err = cn_printf(cn, "%lu", tv.tv_sec);
+                                time64_t time;
+
+                                time = ktime_get_real_seconds();
+                                err = cn_printf(cn, "%lld", time);
                                 break;
                         }
                         /* hostname */