printk changes for 6.3

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Merge tag 'printk-for-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux

Pull printk updates from Petr Mladek:

 - Refactor printk code for formatting messages that are shown on
   consoles. This is a preparatory step for introducing atomic consoles
   which could not share the global buffers

 - Prevent memory leak when removing printk index in debugfs

 - Dump also the newest printk message by the sample gdbmacro

 - Fix a compiler warning

* tag 'printk-for-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux:
  printf: fix errname.c list
  kernel/printk/index.c: fix memory leak with using debugfs_lookup()
  printk: Use scnprintf() to print the message about the dropped messages on a console
  printk: adjust string limit macros
  printk: use printk_buffers for devkmsg
  printk: introduce console_prepend_dropped() for dropped messages
  printk: introduce printk_get_next_message() and printk_message
  printk: introduce struct printk_buffers
  console: Document struct console
  console: Use BIT() macros for @flags values
  printk: move size limit macros into internal.h
  docs: gdbmacros: print newest record

lib/errname.c

@@ -21,6 +21,7 @@ static const char *names_0[] = {
 	E(EADDRNOTAVAIL),
 	E(EADV),
 	E(EAFNOSUPPORT),
+	E(EAGAIN), /* EWOULDBLOCK */
 	E(EALREADY),
 	E(EBADE),
 	E(EBADF),
@@ -31,15 +32,17 @@ static const char *names_0[] = {
 	E(EBADSLT),
 	E(EBFONT),
 	E(EBUSY),
-#ifdef ECANCELLED
-	E(ECANCELLED),
-#endif
+	E(ECANCELED), /* ECANCELLED */
 	E(ECHILD),
 	E(ECHRNG),
 	E(ECOMM),
 	E(ECONNABORTED),
+	E(ECONNREFUSED), /* EREFUSED */
 	E(ECONNRESET),
+	E(EDEADLK), /* EDEADLOCK */
+#if EDEADLK != EDEADLOCK /* mips, sparc, powerpc */
 	E(EDEADLOCK),
+#endif
 	E(EDESTADDRREQ),
 	E(EDOM),
 	E(EDOTDOT),
@@ -166,14 +169,17 @@ static const char *names_0[] = {
 	E(EUSERS),
 	E(EXDEV),
 	E(EXFULL),
-
-	E(ECANCELED), /* ECANCELLED */
-	E(EAGAIN), /* EWOULDBLOCK */
-	E(ECONNREFUSED), /* EREFUSED */
-	E(EDEADLK), /* EDEADLOCK */
 };
 #undef E
 
+#ifdef EREFUSED /* parisc */
+static_assert(EREFUSED == ECONNREFUSED);
+#endif
+#ifdef ECANCELLED /* parisc */
+static_assert(ECANCELLED == ECANCELED);
+#endif
+static_assert(EAGAIN == EWOULDBLOCK); /* everywhere */
+
 #define E(err) [err - 512 + BUILD_BUG_ON_ZERO(err < 512 || err > 550)] = "-" #err
 static const char *names_512[] = {
 	E(ERESTARTSYS),