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Subject[PATCH 2/2] Colored kernel output (run3)

Colored kernel message output (2/2)

By popular request, this patch adds per-loglevel coloring.
The user may set values using vt.printk_color= or by modifying
the sysfs file in the running system.

Signed-off-by: Jan Engelhardt <jengelh@gmx.de>

---
arch/x86_64/kernel/early_printk.c | 11 +++++++----
drivers/char/Kconfig | 4 +++-
drivers/char/vt.c | 32 ++++++++++++++++++++++++--------
drivers/net/netconsole.c | 3 ++-
drivers/serial/8250.c | 3 ++-
drivers/serial/8250_early.c | 3 ++-
include/linux/console.h | 2 +-
kernel/printk.c | 12 +++++++-----
8 files changed, 48 insertions(+), 22 deletions(-)

Index: linux-2.6.23/arch/x86_64/kernel/early_printk.c
===================================================================
--- linux-2.6.23.orig/arch/x86_64/kernel/early_printk.c
+++ linux-2.6.23/arch/x86_64/kernel/early_printk.c
@@ -20,7 +20,8 @@
static int max_ypos = 25, max_xpos = 80;
static int current_ypos = 25, current_xpos = 0;

-static void early_vga_write(struct console *con, const char *str, unsigned n)
+static void early_vga_write(struct console *con, const char *str, unsigned n,
+ unsigned int loglevel)
{
char c;
int i, k, j;
@@ -89,7 +90,8 @@ static int early_serial_putc(unsigned ch
return timeout ? 0 : -1;
}

-static void early_serial_write(struct console *con, const char *s, unsigned n)
+static void early_serial_write(struct console *con, const char *s, unsigned n,
+ unsigned int loglevel)
{
while (*s && n-- > 0) {
if (*s == '\n')
@@ -185,7 +187,8 @@ static void __init simnow_init(char *str
simnow_fd = simnow(XOPEN, (unsigned long)fn, O_WRONLY|O_APPEND|O_CREAT, 0644);
}

-static void simnow_write(struct console *con, const char *s, unsigned n)
+static void simnow_write(struct console *con, const char *s, unsigned n,
+ unsigned int loglevel)
{
simnow(XWRITE, simnow_fd, (unsigned long)s, n);
}
@@ -209,7 +212,7 @@ void early_printk(const char *fmt, ...)

va_start(ap,fmt);
n = vscnprintf(buf,512,fmt,ap);
- early_console->write(early_console,buf,n);
+ early_console->write(early_console, buf, n, 0);
va_end(ap);
}

Index: linux-2.6.23/drivers/char/Kconfig
===================================================================
--- linux-2.6.23.orig/drivers/char/Kconfig
+++ linux-2.6.23/drivers/char/Kconfig
@@ -75,7 +75,9 @@ config VT_PRINTK_COLOR
default 0x07
---help---
This option defines with which color kernel messages will be
- printed to the console.
+ printed to the console. This applies to all log levels.
+ Colors for independent log levels can be set using the
+ vt.printk_color runtime option.

The value you need to enter here is the value is composed
(OR-ed) of a foreground and a background color.
Index: linux-2.6.23/drivers/char/vt.c
===================================================================
--- linux-2.6.23.orig/drivers/char/vt.c
+++ linux-2.6.23/drivers/char/vt.c
@@ -2346,8 +2346,17 @@ struct tty_driver *console_driver;
#ifdef CONFIG_VT_CONSOLE

#ifdef CONFIG_VT_CKO
-static unsigned int printk_color __read_mostly = CONFIG_VT_PRINTK_COLOR;
-module_param(printk_color, uint, S_IRUGO | S_IWUSR);
+static unsigned int printk_color[8] __read_mostly = {
+ CONFIG_VT_PRINTK_COLOR, /* KERN_EMERG */
+ CONFIG_VT_PRINTK_COLOR, /* KERN_ALERT */
+ CONFIG_VT_PRINTK_COLOR, /* KERN_CRIT */
+ CONFIG_VT_PRINTK_COLOR, /* KERN_ERR */
+ CONFIG_VT_PRINTK_COLOR, /* KERN_WARNING */
+ CONFIG_VT_PRINTK_COLOR, /* KERN_NOTICE */
+ CONFIG_VT_PRINTK_COLOR, /* KERN_INFO */
+ CONFIG_VT_PRINTK_COLOR, /* KERN_DEBUG */
+};
+module_param_array(printk_color, uint, NULL, S_IRUGO | S_IWUSR);

static void vc_set_color(struct vc_data *vc, unsigned char color)
{
@@ -2357,7 +2366,7 @@ static void vc_set_color(struct vc_data
update_attr(vc);
}
#else
-static unsigned int printk_color;
+static unsigned int printk_color[8];
static inline void vc_set_color(const struct vc_data *vc, unsigned char c)
{
}
@@ -2369,10 +2378,11 @@ static inline void vc_set_color(const st
* The console must be locked when we get here.
*/

-static void vt_console_print(struct console *co, const char *b, unsigned count)
+static void vt_console_print(struct console *co, const char *b, unsigned count,
+ unsigned int loglevel)
{
struct vc_data *vc = vc_cons[fg_console].d;
- unsigned char c;
+ unsigned char current_color, c;
static unsigned long printing;
const ushort *start;
ushort cnt = 0;
@@ -2403,7 +2413,13 @@ static void vt_console_print(struct cons
hide_cursor(vc);

start = (ushort *)vc->vc_pos;
- vc_set_color(vc, printk_color);
+
+ /*
+ * We always get a valid loglevel - <8> and "no level" is transformed
+ * to <4> in the typical kernel.
+ */
+ current_color = printk_color[loglevel];
+ vc_set_color(vc, current_color);

/* Contrived structure to try to emulate original need_wrap behaviour
* Problems caused when we have need_wrap set on '\n' character */
@@ -2423,7 +2439,7 @@ static void vt_console_print(struct cons
bs(vc);
start = (ushort *)vc->vc_pos;
myx = vc->vc_x;
- vc_set_color(vc, printk_color);
+ vc_set_color(vc, current_color);
continue;
}
if (c != 13)
@@ -2431,7 +2447,7 @@ static void vt_console_print(struct cons
cr(vc);
start = (ushort *)vc->vc_pos;
myx = vc->vc_x;
- vc_set_color(vc, printk_color);
+ vc_set_color(vc, current_color);
if (c == 10 || c == 13)
continue;
}
Index: linux-2.6.23/drivers/net/netconsole.c
===================================================================
--- linux-2.6.23.orig/drivers/net/netconsole.c
+++ linux-2.6.23/drivers/net/netconsole.c
@@ -65,7 +65,8 @@ static int configured = 0;

#define MAX_PRINT_CHUNK 1000

-static void write_msg(struct console *con, const char *msg, unsigned int len)
+static void write_msg(struct console *con, const char *msg, unsigned int len,
+ unsigned int loglevel)
{
int frag, left;
unsigned long flags;
Index: linux-2.6.23/drivers/serial/8250.c
===================================================================
--- linux-2.6.23.orig/drivers/serial/8250.c
+++ linux-2.6.23/drivers/serial/8250.c
@@ -2464,7 +2464,8 @@ static void serial8250_console_putchar(s
* The console_lock must be held when we get here.
*/
static void
-serial8250_console_write(struct console *co, const char *s, unsigned int count)
+serial8250_console_write(struct console *co, const char *s, unsigned int count,
+ unsigned int loglevel)
{
struct uart_8250_port *up = &serial8250_ports[co->index];
unsigned long flags;
Index: linux-2.6.23/drivers/serial/8250_early.c
===================================================================
--- linux-2.6.23.orig/drivers/serial/8250_early.c
+++ linux-2.6.23/drivers/serial/8250_early.c
@@ -82,7 +82,8 @@ static void __init putc(struct uart_port
serial_out(port, UART_TX, c);
}

-static void __init early_serial8250_write(struct console *console, const char *s, unsigned int count)
+static void __init early_serial8250_write(struct console *console,
+ const char *s, unsigned int count, unsigned int loglevel)
{
struct uart_port *port = &early_device.port;
unsigned int ier;
Index: linux-2.6.23/include/linux/console.h
===================================================================
--- linux-2.6.23.orig/include/linux/console.h
+++ linux-2.6.23/include/linux/console.h
@@ -93,7 +93,7 @@ void give_up_console(const struct consw

struct console {
char name[16];
- void (*write)(struct console *, const char *, unsigned);
+ void (*write)(struct console *, const char *, unsigned, unsigned int);
int (*read)(struct console *, char *, unsigned);
struct tty_driver *(*device)(struct console *, int *);
void (*unblank)(void);
Index: linux-2.6.23/kernel/printk.c
===================================================================
--- linux-2.6.23.orig/kernel/printk.c
+++ linux-2.6.23/kernel/printk.c
@@ -320,7 +320,8 @@ asmlinkage long sys_syslog(int type, cha
/*
* Call the console drivers on a range of log_buf
*/
-static void __call_console_drivers(unsigned long start, unsigned long end)
+static void __call_console_drivers(unsigned long start, unsigned long end,
+ unsigned int loglevel)
{
struct console *con;

@@ -328,7 +329,7 @@ static void __call_console_drivers(unsig
if ((con->flags & CON_ENABLED) && con->write &&
(cpu_online(smp_processor_id()) ||
(con->flags & CON_ANYTIME)))
- con->write(con, &LOG_BUF(start), end - start);
+ con->write(con, &LOG_BUF(start), end - start, loglevel);
}
}

@@ -355,10 +356,11 @@ static void _call_console_drivers(unsign
if ((start & LOG_BUF_MASK) > (end & LOG_BUF_MASK)) {
/* wrapped write */
__call_console_drivers(start & LOG_BUF_MASK,
- log_buf_len);
- __call_console_drivers(0, end & LOG_BUF_MASK);
+ log_buf_len, msg_log_level);
+ __call_console_drivers(0, end & LOG_BUF_MASK,
+ msg_log_level);
} else {
- __call_console_drivers(start, end);
+ __call_console_drivers(start, end, msg_log_level);
}
}
}
-
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