mm, hugetlb: add thread name and pid to SHM_HUGETLB mlock rlimit warning

Add the thread name and pid of the application that is allocating shm
segments with MAP_HUGETLB without being a part of
/proc/sys/vm/hugetlb_shm_group or having CAP_IPC_LOCK.

This identifies the application so it may be fixed by avoiding using the
deprecated exception (see Documentation/feature-removal-schedule.txt).

Signed-off-by: David Rientjes <rientjes@google.com>
Cc: Dave Jones <davej@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 7913e3252167..79408159a001 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -953,7 +953,11 @@ struct file *hugetlb_file_setup(const char *name, size_t size,
         if (creat_flags == HUGETLB_SHMFS_INODE && !can_do_hugetlb_shm()) {
                 *user = current_user();
                 if (user_shm_lock(size, *user)) {
-                        printk_once(KERN_WARNING "Using mlock ulimits for SHM_HUGETLB is deprecated\n");
+                        task_lock(current);
+                        printk_once(KERN_WARNING
+                                "%s (%d): Using mlock ulimits for SHM_HUGETLB is deprecated\n",
+                                current->comm, current->pid);
+                        task_unlock(current);
                 } else {
                         *user = NULL;
                         return ERR_PTR(-EPERM);