kernel: remove get_task_comm() and print task comm directly

Patch series "Remove get_task_comm() and print task comm directly", v2.

Since task->comm is guaranteed to be NUL-terminated, we can print it
directly without the need to copy it into a separate buffer.  This
simplifies the code and avoids unnecessary operations.


This patch (of 5):

Since task->comm is guaranteed to be NUL-terminated, we can print it
directly without the need to copy it into a separate buffer.  This
simplifies the code and avoids unnecessary operations.

Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Yafang Shao <[email protected]>
Cc: Serge Hallyn <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Darren Hart <[email protected]>
Cc: Davidlohr Bueso <[email protected]>
Cc: "André Almeida" <[email protected]>
Cc: Andy Shevchenko <[email protected]>
Cc: Borislav Petkov (AMD) <[email protected]>
Cc: Kalle Valo <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Petr Mladek <[email protected]>
Cc: Danilo Krummrich <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: David Airlie <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: James Morris <[email protected]>
Cc: Jani Nikula <[email protected]>
Cc: Jiri Slaby <[email protected]>
Cc: Johannes Berg <[email protected]>
Cc: Joonas Lahtinen <[email protected]>
Cc: Karol Herbst <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Lyude Paul <[email protected]>
Cc: Oded Gabbay <[email protected]>
Cc: Paul Moore <[email protected]>
Cc: Rodrigo Vivi <[email protected]>
Cc: Simona Vetter <[email protected]>
Cc: Tvrtko Ursulin <[email protected]>
Cc: Vineet Gupta <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: laoar

kernel/capability.c

@@ -38,10 +38,8 @@ __setup("no_file_caps", file_caps_disable);
 
 static void warn_legacy_capability_use(void)
 {
-	char name[sizeof(current->comm)];
-
 	pr_info_once("warning: `%s' uses 32-bit capabilities (legacy support in use)\n",
-		     get_task_comm(name, current));
+		     current->comm);
 }
 
 /*
@@ -62,10 +60,8 @@ static void warn_legacy_capability_use(void)
 
 static void warn_deprecated_v2(void)
 {
-	char name[sizeof(current->comm)];
-
 	pr_info_once("warning: `%s' uses deprecated v2 capabilities in a way that may be insecure\n",
-		     get_task_comm(name, current));
+		     current->comm);
 }
 
 /*

kernel/futex/waitwake.c

@@ -210,13 +210,12 @@ static int futex_atomic_op_inuser(unsigned int encoded_op, u32 __user *uaddr)
 
 	if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) {
 		if (oparg < 0 || oparg > 31) {
-			char comm[sizeof(current->comm)];
 			/*
 			 * kill this print and return -EINVAL when userspace
 			 * is sane again
 			 */
 			pr_info_ratelimited("futex_wake_op: %s tries to shift op by %d; fix this program\n",
-					get_task_comm(comm, current), oparg);
+					    current->comm, oparg);
 			oparg &= 31;
 		}
 		oparg = 1 << oparg;