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early_printk: consolidate random copies of identical code 

The early console implementations are the same all over the place.  Move
the print function to kernel/printk and get rid of the copies.

[akpm@linux-foundation.org: arch/mips/kernel/early_printk.c needs kernel.h for va_list]
[paul.gortmaker@windriver.com: sh4: make the bios early console support depend on EARLY_PRINTK]
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Russell King <linux@arm.linux.org.uk>
Acked-by: Mike Frysinger <vapier@gentoo.org>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Richard Weinberger <richard@nod.at>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Tested-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Thomas Gleixner 2013-04-29 16:17:18 -07:00 committed by Linus Torvalds
parent 07c65f4d1a
commit d0380e6c3c
13 changed files with 63 additions and 109 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
arch/arm/kernel/early_printk.c
View File

@ -29,28 +29,17 @@ static void early_console_write(struct console *con, const char *s, unsigned n)
early_write(s, n);
}
static struct console early_console = {
static struct console early_console_dev = {
.name = "earlycon",
.write = early_console_write,
.flags = CON_PRINTBUFFER | CON_BOOT,
.index = -1,
};
asmlinkage void early_printk(const char *fmt, ...)
{
char buf[512];
int n;
va_list ap;
va_start(ap, fmt);
n = vscnprintf(buf, sizeof(buf), fmt, ap);
early_write(buf, n);
va_end(ap);
}
static int __init setup_early_printk(char *buf)
{
register_console(&early_console);
early_console = &early_console_dev;
register_console(&early_console_dev);
return 0;
}

2
arch/blackfin/kernel/early_printk.c
View File

@ -25,8 +25,6 @@ extern struct console *bfin_earlyserial_init(unsigned int port,
extern struct console *bfin_jc_early_init(void);
#endif
static struct console *early_console;
/* Default console */
#define DEFAULT_PORT 0
#define DEFAULT_CFLAG CS8|B57600

26
arch/microblaze/kernel/early_printk.c
View File

@ -21,7 +21,6 @@
#include <asm/setup.h>
#include <asm/prom.h>
static u32 early_console_initialized;
static u32 base_addr;
#ifdef CONFIG_SERIAL_UARTLITE_CONSOLE
@ -109,27 +108,11 @@ static struct console early_serial_uart16550_console = {
};
#endif /* CONFIG_SERIAL_8250_CONSOLE */
static struct console *early_console;
void early_printk(const char *fmt, ...)
{
char buf[512];
int n;
va_list ap;
if (early_console_initialized) {
va_start(ap, fmt);
n = vscnprintf(buf, 512, fmt, ap);
early_console->write(early_console, buf, n);
va_end(ap);
}
}
int __init setup_early_printk(char *opt)
{
int version = 0;
if (early_console_initialized)
if (early_console)
return 1;
base_addr = of_early_console(&version);
@ -159,7 +142,6 @@ int __init setup_early_printk(char *opt)
}
register_console(early_console);
early_console_initialized = 1;
return 0;
}
return 1;
@ -169,7 +151,7 @@ int __init setup_early_printk(char *opt)
* only for early console because of performance degression */
void __init remap_early_printk(void)
{
if (!early_console_initialized || !early_console)
if (!early_console)
return;
pr_info("early_printk_console remapping from 0x%x to ", base_addr);
base_addr = (u32) ioremap(base_addr, PAGE_SIZE);
@ -194,9 +176,9 @@ void __init remap_early_printk(void)
void __init disable_early_printk(void)
{
if (!early_console_initialized || !early_console)
if (!early_console)
return;
pr_warn("disabling early console\n");
unregister_console(early_console);
early_console_initialized = 0;
early_console = NULL;
}

12
arch/mips/kernel/early_printk.c
View File

@ -7,7 +7,9 @@
* Copyright (C) 2007 MIPS Technologies, Inc.
* written by Ralf Baechle (ralf@linux-mips.org)
*/
#include <linux/kernel.h>
#include <linux/console.h>
#include <linux/printk.h>
#include <linux/init.h>
#include <asm/setup.h>
@ -24,20 +26,18 @@ static void early_console_write(struct console *con, const char *s, unsigned n)
}
}
static struct console early_console = {
static struct console early_console_prom = {
.name = "early",
.write = early_console_write,
.flags = CON_PRINTBUFFER | CON_BOOT,
.index = -1
};
static int early_console_initialized __initdata;
void __init setup_early_printk(void)
{
if (early_console_initialized)
if (early_console)
return;
early_console_initialized = 1;
early_console = &early_console_prom;
register_console(&early_console);
register_console(&early_console_prom);
}

6
arch/powerpc/kernel/udbg.c
View File

@ -156,15 +156,13 @@ static struct console udbg_console = {
.index = 0,
};
static int early_console_initialized;
/*
* Called by setup_system after ppc_md->probe and ppc_md->early_init.
* Call it again after setting udbg_putc in ppc_md->setup_arch.
*/
void __init register_early_udbg_console(void)
{
if (early_console_initialized)
if (early_console)
return;
if (!udbg_putc)
@ -174,7 +172,7 @@ void __init register_early_udbg_console(void)
printk(KERN_INFO "early console immortal !\n");
udbg_console.flags &= ~CON_BOOT;
}
early_console_initialized = 1;
early_console = &udbg_console;
register_console(&udbg_console);
}

4
arch/sh/kernel/sh_bios.c
View File

@ -104,6 +104,7 @@ void sh_bios_vbr_reload(void)
);
}
#ifdef CONFIG_EARLY_PRINTK
/*
* Print a string through the BIOS
*/
@ -144,8 +145,6 @@ static struct console bios_console = {
.index = -1,
};
static struct console *early_console;
static int __init setup_early_printk(char *buf)
{
int keep_early = 0;
@ -170,3 +169,4 @@ static int __init setup_early_printk(char *buf)
return 0;
}
early_param("earlyprintk", setup_early_printk);
#endif

27
arch/tile/kernel/early_printk.c
View File

@ -17,6 +17,7 @@
#include <linux/init.h>
#include <linux/string.h>
#include <linux/irqflags.h>
#include <linux/printk.h>
#include <asm/setup.h>
#include <hv/hypervisor.h>
@ -33,25 +34,8 @@ static struct console early_hv_console = {
};
/* Direct interface for emergencies */
static struct console *early_console = &early_hv_console;
static int early_console_initialized;
static int early_console_complete;
static void early_vprintk(const char *fmt, va_list ap)
{
char buf[512];
int n = vscnprintf(buf, sizeof(buf), fmt, ap);
early_console->write(early_console, buf, n);
}
void early_printk(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
early_vprintk(fmt, ap);
va_end(ap);
}
void early_panic(const char *fmt, ...)
{
va_list ap;
@ -69,14 +53,13 @@ static int __initdata keep_early;
static int __init setup_early_printk(char *str)
{
if (early_console_initialized)
if (early_console)
return 1;
if (str != NULL && strncmp(str, "keep", 4) == 0)
keep_early = 1;
early_console = &early_hv_console;
early_console_initialized = 1;
register_console(early_console);
return 0;
@ -85,12 +68,12 @@ static int __init setup_early_printk(char *str)
void __init disable_early_printk(void)
{
early_console_complete = 1;
if (!early_console_initialized || !early_console)
if (!early_console)
return;
if (!keep_early) {
early_printk("disabling early console\n");
unregister_console(early_console);
early_console_initialized = 0;
early_console = NULL;
} else {
early_printk("keeping early console\n");
}
@ -98,7 +81,7 @@ void __init disable_early_printk(void)
void warn_early_printk(void)
{
if (early_console_complete || early_console_initialized)
if (early_console_complete || early_console)
return;
early_printk("\
Machine shutting down before console output is fully initialized.\n\

8
arch/um/kernel/early_printk.c
View File

@ -16,7 +16,7 @@ static void early_console_write(struct console *con, const char *s, unsigned int
um_early_printk(s, n);
}
static struct console early_console = {
static struct console early_console_dev = {
.name = "earlycon",
.write = early_console_write,
.flags = CON_BOOT,
@ -25,8 +25,10 @@ static struct console early_console = {
static int __init setup_early_printk(char *buf)
{
register_console(&early_console);
if (!early_console) {
early_console = &early_console_dev;
register_console(&early_console_dev);
}
return 0;
}

12
arch/unicore32/kernel/early_printk.c
View File

@ -33,21 +33,17 @@ static struct console early_ocd_console = {
.index = -1,
};
/* Direct interface for emergencies */
static struct console *early_console = &early_ocd_console;
static int __initdata keep_early;
static int __init setup_early_printk(char *buf)
{
if (!buf)
int keep_early;
if (!buf || early_console)
return 0;
if (strstr(buf, "keep"))
keep_early = 1;
if (!strncmp(buf, "ocd", 3))
early_console = &early_ocd_console;
early_console = &early_ocd_console;
if (keep_early)
early_console->flags &= ~CON_BOOT;

21
arch/x86/kernel/early_printk.c
View File

@ -169,25 +169,9 @@ static struct console early_serial_console = {
.index = -1,
};
/* Direct interface for emergencies */
static struct console *early_console = &early_vga_console;
static int __initdata early_console_initialized;
asmlinkage void early_printk(const char *fmt, ...)
{
char buf[512];
int n;
va_list ap;
va_start(ap, fmt);
n = vscnprintf(buf, sizeof(buf), fmt, ap);
early_console->write(early_console, buf, n);
va_end(ap);
}
static inline void early_console_register(struct console *con, int keep_early)
{
if (early_console->index != -1) {
if (con->index != -1) {
printk(KERN_CRIT "ERROR: earlyprintk= %s already used\n",
con->name);
return;
@ -207,9 +191,8 @@ static int __init setup_early_printk(char *buf)
if (!buf)
return 0;
if (early_console_initialized)
if (early_console)
return 0;
early_console_initialized = 1;
keep = (strstr(buf, "keep") != NULL);

1
include/linux/console.h
View File

@ -141,6 +141,7 @@ struct console {
for (con = console_drivers; con != NULL; con = con->next)
extern int console_set_on_cmdline;
extern struct console *early_console;
extern int add_preferred_console(char *name, int idx, char *options);
extern int update_console_cmdline(char *name, int idx, char *name_new, int idx_new, char *options);

6
include/linux/printk.h
View File

@ -95,8 +95,14 @@ int no_printk(const char *fmt, ...)
return 0;
}
#ifdef CONFIG_EARLY_PRINTK
extern asmlinkage __printf(1, 2)
void early_printk(const char *fmt, ...);
void early_vprintk(const char *fmt, va_list ap);
#else
static inline __printf(1, 2) __cold
void early_printk(const char *s, ...) { }
#endif
#ifdef CONFIG_PRINTK
asmlinkage __printf(5, 0)

30
kernel/printk.c
View File

@ -49,13 +49,6 @@
#define CREATE_TRACE_POINTS
#include <trace/events/printk.h>
/*
* Architectures can override it:
*/
void asmlinkage __attribute__((weak)) early_printk(const char *fmt, ...)
{
}
/* printk's without a loglevel use this.. */
#define DEFAULT_MESSAGE_LOGLEVEL CONFIG_DEFAULT_MESSAGE_LOGLEVEL
@ -1723,6 +1716,29 @@ static size_t cont_print_text(char *text, size_t size) { return 0; }
#endif /* CONFIG_PRINTK */
#ifdef CONFIG_EARLY_PRINTK
struct console *early_console;
void early_vprintk(const char *fmt, va_list ap)
{
if (early_console) {
char buf[512];
int n = vscnprintf(buf, sizeof(buf), fmt, ap);
early_console->write(early_console, buf, n);
}
}
asmlinkage void early_printk(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
early_vprintk(fmt, ap);
va_end(ap);
}
#endif
static int __add_preferred_console(char *name, int idx, char *options,
char *brl_options)
{