[PATCH] comments on locking of task->comm

Add some comments about task->comm, to explain what it is near its definition
and provide some important pointers to its uses.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

fs/exec.c

···
 	if (current->euid == current->uid && current->egid == current->gid)
 		current->mm->dumpable = 1;
 	name = bprm->filename;
+
+	/* Copies the binary name from after last slash */
 	for (i=0; (ch = *(name++)) != '\0';) {
 		if (ch == '/')
-			i = 0;
+			i = 0; /* overwrite what we wrote */
 		else
 			if (i < (sizeof(tcomm) - 1))
 				tcomm[i++] = ch;

include/linux/sched.h

···
 	unsigned long flags;	/* per process flags, defined below */
 	unsigned long ptrace;
 
-	int lock_depth;		/* Lock depth */
+	int lock_depth;		/* BKL lock depth */
 
 	int prio, static_prio;
 	struct list_head run_list;
···
 	struct key *thread_keyring;	/* keyring private to this thread */
 #endif
 	int oomkilladj; /* OOM kill score adjustment (bit shift). */
-	char comm[TASK_COMM_LEN];
+	char comm[TASK_COMM_LEN]; /* executable name excluding path
+				     - access with [gs]et_task_comm (which lock
+				       it with task_lock())
+				     - initialized normally by flush_old_exec */
 /* file system info */
 	int link_count, total_link_count;
 /* ipc stuff */