[patch 1/1] early_printk: Consolidate random copies of identical code
From: Thomas Gleixner
Date: Tue Feb 19 2013 - 07:44:45 EST
The early console implementations are the same all over the
place. Move the print function to kernel/printk and get rid of the
copies.
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxxx>
Cc: Mike Frysinger <vapier@xxxxxxxxxx>
Cc: Michal Simek <monstr@xxxxxxxxx>
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Paul Mundt <lethal@xxxxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Chris Metcalf <cmetcalf@xxxxxxxxxx>
Cc: Richard Weinberger <richard@xxxxxx>
Cc: x86@xxxxxxxxxx
---
arch/arm/kernel/early_printk.c | 17 +++--------------
arch/blackfin/kernel/early_printk.c | 2 --
arch/microblaze/kernel/early_printk.c | 26 ++++----------------------
arch/mips/kernel/early_printk.c | 11 +++++------
arch/powerpc/kernel/udbg.c | 6 ++----
arch/sh/kernel/sh_bios.c | 2 --
arch/sparc/kernel/setup_32.c | 1 +
arch/sparc/kernel/setup_64.c | 8 +++++++-
arch/tile/kernel/early_printk.c | 27 +++++----------------------
arch/um/kernel/early_printk.c | 8 +++++---
arch/unicore32/kernel/early_printk.c | 12 ++++--------
arch/x86/kernel/early_printk.c | 21 ++-------------------
include/linux/console.h | 1 +
include/linux/printk.h | 6 ++++++
kernel/printk.c | 30 +++++++++++++++++++++++-------
15 files changed, 68 insertions(+), 110 deletions(-)
Index: linux-stable/arch/arm/kernel/early_printk.c
===================================================================
--- linux-stable.orig/arch/arm/kernel/early_printk.c
+++ linux-stable/arch/arm/kernel/early_printk.c
@@ -29,28 +29,17 @@ static void early_console_write(struct c
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;
}
Index: linux-stable/arch/blackfin/kernel/early_printk.c
===================================================================
--- linux-stable.orig/arch/blackfin/kernel/early_printk.c
+++ linux-stable/arch/blackfin/kernel/early_printk.c
@@ -25,8 +25,6 @@ extern struct console *bfin_earlyserial_
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
Index: linux-stable/arch/microblaze/kernel/early_printk.c
===================================================================
--- linux-stable.orig/arch/microblaze/kernel/early_printk.c
+++ linux-stable/arch/microblaze/kernel/early_printk.c
@@ -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_uart1
};
#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;
printk(KERN_INFO "early_printk_console remapping from 0x%x to ",
base_addr);
@@ -195,9 +177,9 @@ void __init remap_early_printk(void)
void __init disable_early_printk(void)
{
- if (!early_console_initialized || !early_console)
+ if (!early_console)
return;
printk(KERN_WARNING "disabling early console\n");
unregister_console(early_console);
- early_console_initialized = 0;
+ early_console = NULL;
}
Index: linux-stable/arch/mips/kernel/early_printk.c
===================================================================
--- linux-stable.orig/arch/mips/kernel/early_printk.c
+++ linux-stable/arch/mips/kernel/early_printk.c
@@ -8,6 +8,7 @@
* written by Ralf Baechle (ralf@xxxxxxxxxxxxxx)
*/
#include <linux/console.h>
+#include <linux/printk.h>
#include <linux/init.h>
#include <asm/setup.h>
@@ -25,20 +26,18 @@ early_console_write(struct console *con,
}
}
-static struct console early_console __initdata = {
+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);
}
Index: linux-stable/arch/powerpc/kernel/udbg.c
===================================================================
--- linux-stable.orig/arch/powerpc/kernel/udbg.c
+++ linux-stable/arch/powerpc/kernel/udbg.c
@@ -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(
printk(KERN_INFO "early console immortal !\n");
udbg_console.flags &= ~CON_BOOT;
}
- early_console_initialized = 1;
+ early_console = &udbg_console;
register_console(&udbg_console);
}
Index: linux-stable/arch/sh/kernel/sh_bios.c
===================================================================
--- linux-stable.orig/arch/sh/kernel/sh_bios.c
+++ linux-stable/arch/sh/kernel/sh_bios.c
@@ -144,8 +144,6 @@ static struct console bios_console = {
.index = -1,
};
-static struct console *early_console;
-
static int __init setup_early_printk(char *buf)
{
int keep_early = 0;
Index: linux-stable/arch/sparc/kernel/setup_32.c
===================================================================
--- linux-stable.orig/arch/sparc/kernel/setup_32.c
+++ linux-stable/arch/sparc/kernel/setup_32.c
@@ -309,6 +309,7 @@ void __init setup_arch(char **cmdline_p)
boot_flags_init(*cmdline_p);
+ early_console = &prom_early_console;
register_console(&prom_early_console);
printk("ARCH: ");
Index: linux-stable/arch/sparc/kernel/setup_64.c
===================================================================
--- linux-stable.orig/arch/sparc/kernel/setup_64.c
+++ linux-stable/arch/sparc/kernel/setup_64.c
@@ -551,6 +551,12 @@ static void __init init_sparc64_elf_hwca
pause_patch();
}
+static inline void register_prom_console(void)
+{
+ early_console = &prom_early_console;
+ register_console(&prom_early_console);
+}
+
void __init setup_arch(char **cmdline_p)
{
/* Initialize PROM console and command line. */
@@ -562,7 +568,7 @@ void __init setup_arch(char **cmdline_p)
#ifdef CONFIG_EARLYFB
if (btext_find_display())
#endif
- register_console(&prom_early_console);
+ register_prom_console();
if (tlb_type == hypervisor)
printk("ARCH: SUN4V\n");
Index: linux-stable/arch/tile/kernel/early_printk.c
===================================================================
--- linux-stable.orig/arch/tile/kernel/early_printk.c
+++ linux-stable/arch/tile/kernel/early_printk.c
@@ -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(cha
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\
Index: linux-stable/arch/um/kernel/early_printk.c
===================================================================
--- linux-stable.orig/arch/um/kernel/early_printk.c
+++ linux-stable/arch/um/kernel/early_printk.c
@@ -16,7 +16,7 @@ static void early_console_write(struct c
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;
}
Index: linux-stable/arch/unicore32/kernel/early_printk.c
===================================================================
--- linux-stable.orig/arch/unicore32/kernel/early_printk.c
+++ linux-stable/arch/unicore32/kernel/early_printk.c
@@ -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;
Index: linux-stable/arch/x86/kernel/early_printk.c
===================================================================
--- linux-stable.orig/arch/x86/kernel/early_printk.c
+++ linux-stable/arch/x86/kernel/early_printk.c
@@ -169,25 +169,9 @@ static struct console early_serial_conso
.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(cha
if (!buf)
return 0;
- if (early_console_initialized)
+ if (early_console)
return 0;
- early_console_initialized = 1;
keep = (strstr(buf, "keep") != NULL);
Index: linux-stable/include/linux/console.h
===================================================================
--- linux-stable.orig/include/linux/console.h
+++ linux-stable/include/linux/console.h
@@ -139,6 +139,7 @@ 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);
Index: linux-stable/include/linux/printk.h
===================================================================
--- linux-stable.orig/include/linux/printk.h
+++ linux-stable/include/linux/printk.h
@@ -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
extern int printk_needs_cpu(int cpu);
extern void printk_tick(void);
Index: linux-stable/kernel/printk.c
===================================================================
--- linux-stable.orig/kernel/printk.c
+++ linux-stable/kernel/printk.c
@@ -48,13 +48,6 @@
#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
@@ -756,6 +749,29 @@ module_param(ignore_loglevel, bool, S_IR
MODULE_PARM_DESC(ignore_loglevel, "ignore loglevel setting, to"
"print all kernel messages to the console.");
+#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
+
#ifdef CONFIG_BOOT_PRINTK_DELAY
static int boot_delay; /* msecs delay after each printk during bootup */
--
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