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authorBernhard Walle <bernhard@bwalle.de>2009-12-14 18:00:43 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-15 08:53:28 -0800
commit5ada918b82399eef3afd6a71e3637697d6bd719f (patch)
tree9bff5251d9d21960726078c2117a0ab19ca25956 /kernel/power/console.c
parentc95d1e53ed89b75a4d7b68d1cbae4607b1479243 (diff)
downloadlinux-5ada918b82399eef3afd6a71e3637697d6bd719f.tar.gz
vt: introduce and use vt_kmsg_redirect() function
The kernel offers with TIOCL_GETKMSGREDIRECT ioctl() the possibility to redirect the kernel messages to a specific console. However, since it's not possible to switch to the kernel message console after a panic(), it would be nice if the kernel would print the panic message on the current console. This patch series adds a new interface to access the global kmsg_redirect variable by a function to be able to use it in code where CONFIG_VT_CONSOLE is not set (kernel/panic.c). This patch: Instead of using and exporting a global value kmsg_redirect, introduce a function vt_kmsg_redirect() that both can set and return the console where messages are printed. Change all users of kmsg_redirect (the VT code itself and kernel/power.c) to the new interface. The main advantage is that vt_kmsg_redirect() can also be used when CONFIG_VT_CONSOLE is not set. Signed-off-by: Bernhard Walle <bernhard@bwalle.de> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/power/console.c')
-rw-r--r--kernel/power/console.c7
1 files changed, 3 insertions, 4 deletions
diff --git a/kernel/power/console.c b/kernel/power/console.c
index 5187136fe1d..218e5af9015 100644
--- a/kernel/power/console.c
+++ b/kernel/power/console.c
@@ -6,7 +6,7 @@
#include <linux/vt_kern.h>
#include <linux/kbd_kern.h>
-#include <linux/console.h>
+#include <linux/vt.h>
#include <linux/module.h>
#include "power.h"
@@ -21,8 +21,7 @@ int pm_prepare_console(void)
if (orig_fgconsole < 0)
return 1;
- orig_kmsg = kmsg_redirect;
- kmsg_redirect = SUSPEND_CONSOLE;
+ orig_kmsg = vt_kmsg_redirect(SUSPEND_CONSOLE);
return 0;
}
@@ -30,7 +29,7 @@ void pm_restore_console(void)
{
if (orig_fgconsole >= 0) {
vt_move_to_console(orig_fgconsole, 0);
- kmsg_redirect = orig_kmsg;
+ vt_kmsg_redirect(orig_kmsg);
}
}
#endif