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author | 2015-08-04 12:17:53 -0700 | |
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committer | 2015-08-04 15:44:42 -0700 | |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/um/drivers/stderr_console.c | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/um/drivers/stderr_console.c')
-rw-r--r-- | kernel/arch/um/drivers/stderr_console.c | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/kernel/arch/um/drivers/stderr_console.c b/kernel/arch/um/drivers/stderr_console.c new file mode 100644 index 000000000..d07a97f8b --- /dev/null +++ b/kernel/arch/um/drivers/stderr_console.c @@ -0,0 +1,62 @@ +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/console.h> + +#include "chan_user.h" + +/* ----------------------------------------------------------------------------- */ +/* trivial console driver -- simply dump everything to stderr */ + +/* + * Don't register by default -- as this registers very early in the + * boot process it becomes the default console. + * + * Initialized at init time. + */ +static int use_stderr_console = 0; + +static void stderr_console_write(struct console *console, const char *string, + unsigned len) +{ + generic_write(2 /* stderr */, string, len, NULL); +} + +static struct console stderr_console = { + .name = "stderr", + .write = stderr_console_write, + .flags = CON_PRINTBUFFER, +}; + +static int __init stderr_console_init(void) +{ + if (use_stderr_console) + register_console(&stderr_console); + return 0; +} +console_initcall(stderr_console_init); + +static int stderr_setup(char *str) +{ + if (!str) + return 0; + use_stderr_console = simple_strtoul(str,&str,0); + return 1; +} +__setup("stderr=", stderr_setup); + +/* The previous behavior of not unregistering led to /dev/console being + * impossible to open. My FC5 filesystem started having init die, and the + * system panicing because of this. Unregistering causes the real + * console to become the default console, and /dev/console can then be + * opened. Making this an initcall makes this happen late enough that + * there is no added value in dumping everything to stderr, and the + * normal console is good enough to show you all available output. + */ +static int __init unregister_stderr(void) +{ + unregister_console(&stderr_console); + + return 0; +} + +__initcall(unregister_stderr); |