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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /arch/um/drivers/stderr_console.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/um/drivers/stderr_console.c')
-rw-r--r-- | arch/um/drivers/stderr_console.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/arch/um/drivers/stderr_console.c b/arch/um/drivers/stderr_console.c new file mode 100644 index 000000000..ecc3a5814 --- /dev/null +++ b/arch/um/drivers/stderr_console.c @@ -0,0 +1,63 @@ +// SPDX-License-Identifier: GPL-2.0 +#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); |