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authorMatt Mackall <mpm@selenic.com>2005-05-01 11:59:02 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-05-01 11:59:02 -0400
commitd59745ce3e7aa13856bca16d3bcbb95041775ff6 (patch)
tree6e495bb6697d86534685bf813c43e210a8d8323a /kernel/printk.c
parentcd7619d6bf36564cf54ff7218ef54e558a741913 (diff)
[PATCH] clean up kernel messages
Arrange for all kernel printks to be no-ops. Only available if CONFIG_EMBEDDED. This patch saves about 375k on my laptop config and nearly 100k on minimal configs. Signed-off-by: Matt Mackall <mpm@selenic.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/printk.c')
-rw-r--r--kernel/printk.c27
1 files changed, 21 insertions, 6 deletions
diff --git a/kernel/printk.c b/kernel/printk.c
index 1498689548d1..290a07ce2c8a 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -85,10 +85,6 @@ static int console_locked;
85 */ 85 */
86static DEFINE_SPINLOCK(logbuf_lock); 86static DEFINE_SPINLOCK(logbuf_lock);
87 87
88static char __log_buf[__LOG_BUF_LEN];
89static char *log_buf = __log_buf;
90static int log_buf_len = __LOG_BUF_LEN;
91
92#define LOG_BUF_MASK (log_buf_len-1) 88#define LOG_BUF_MASK (log_buf_len-1)
93#define LOG_BUF(idx) (log_buf[(idx) & LOG_BUF_MASK]) 89#define LOG_BUF(idx) (log_buf[(idx) & LOG_BUF_MASK])
94 90
@@ -99,7 +95,6 @@ static int log_buf_len = __LOG_BUF_LEN;
99static unsigned long log_start; /* Index into log_buf: next char to be read by syslog() */ 95static unsigned long log_start; /* Index into log_buf: next char to be read by syslog() */
100static unsigned long con_start; /* Index into log_buf: next char to be sent to consoles */ 96static unsigned long con_start; /* Index into log_buf: next char to be sent to consoles */
101static unsigned long log_end; /* Index into log_buf: most-recently-written-char + 1 */ 97static unsigned long log_end; /* Index into log_buf: most-recently-written-char + 1 */
102static unsigned long logged_chars; /* Number of chars produced since last read+clear operation */
103 98
104/* 99/*
105 * Array of consoles built from command line options (console=) 100 * Array of consoles built from command line options (console=)
@@ -120,6 +115,13 @@ static int preferred_console = -1;
120/* Flag: console code may call schedule() */ 115/* Flag: console code may call schedule() */
121static int console_may_schedule; 116static int console_may_schedule;
122 117
118#ifdef CONFIG_PRINTK
119
120static char __log_buf[__LOG_BUF_LEN];
121static char *log_buf = __log_buf;
122static int log_buf_len = __LOG_BUF_LEN;
123static unsigned long logged_chars; /* Number of chars produced since last read+clear operation */
124
123/* 125/*
124 * Setup a list of consoles. Called from init/main.c 126 * Setup a list of consoles. Called from init/main.c
125 */ 127 */
@@ -535,6 +537,7 @@ __setup("time", printk_time_setup);
535 * then changes console_loglevel may break. This is because console_loglevel 537 * then changes console_loglevel may break. This is because console_loglevel
536 * is inspected when the actual printing occurs. 538 * is inspected when the actual printing occurs.
537 */ 539 */
540
538asmlinkage int printk(const char *fmt, ...) 541asmlinkage int printk(const char *fmt, ...)
539{ 542{
540 va_list args; 543 va_list args;
@@ -655,6 +658,18 @@ out:
655EXPORT_SYMBOL(printk); 658EXPORT_SYMBOL(printk);
656EXPORT_SYMBOL(vprintk); 659EXPORT_SYMBOL(vprintk);
657 660
661#else
662
663asmlinkage long sys_syslog(int type, char __user * buf, int len)
664{
665 return 0;
666}
667
668int do_syslog(int type, char __user * buf, int len) { return 0; }
669static void call_console_drivers(unsigned long start, unsigned long end) {}
670
671#endif
672
658/** 673/**
659 * acquire_console_sem - lock the console system for exclusive use. 674 * acquire_console_sem - lock the console system for exclusive use.
660 * 675 *
@@ -931,7 +946,7 @@ int unregister_console(struct console * console)
931 return res; 946 return res;
932} 947}
933EXPORT_SYMBOL(unregister_console); 948EXPORT_SYMBOL(unregister_console);
934 949
935/** 950/**
936 * tty_write_message - write a message to a certain tty, not just the console. 951 * tty_write_message - write a message to a certain tty, not just the console.
937 * 952 *